Merge pull request #6 from koloideal/better-tests

100% codebase test coverage
2026-06-10 10:05:28 +03:00 · 2025-12-07 01:55:04 +03:00
parent b0e6127c1e 425342c059
commit cb6549452d
31 changed files with 2749 additions and 1300 deletions
@@ -318,3 +318,5 @@ http-client.private.env.json
 # Apifox Helper cache
 .idea/.cache/.Apifox_Helper
 .idea/ApifoxUploaderProjectSetting.xml
+
+.zed
@@ -30,7 +30,7 @@ App
                system_router_title: str | None = "System points:", 
                ignore_command_register: bool = True, 
                dividing_line: AVAILABLE_DIVIDING_LINES = DEFAULT_DIVIDING_LINE, 
-                repeat_command_groups_printing: bool = True, 
+                repeat_command_groups_printing: bool = False, 
                override_system_messages: bool = False, 
                autocompleter: AutoCompleter = DEFAULT_AUTOCOMPLETER, 
                print_func: Printer = DEFAULT_PRINT_FUNC) -> None
@@ -13,6 +13,10 @@ tests:
 tests-cov:
    python -m pytest --cov=argenta tests

+# Запустить тесты с отчетом о покрытии с html репортом
+tests-cov-html:
+    python -m pytest --cov=argenta tests --cov-report=html
+
 # Отформатировать код (Ruff + isort)
 format:
    python -m ruff format ./src
@@ -1,2 +1,19 @@
-import sys
-print(sys.version_info >= (3, 13))
+from argenta import App, DataBridge, Response, Router
+from argenta.di import FromDishka
+from argenta.di.integration import setup_dishka, _auto_inject_handlers
+from argenta.di.providers import SystemProvider
+from dishka import make_container
+
+container = make_container()
+
+Response.patch_by_container(container)
+
+app = App()
+router = Router()
+
+@router.command('command')
+def handler(res: Response, data_bridge: FromDishka[DataBridge]):
+    print(data_bridge)
+    
+_auto_inject_handlers(app)
+_auto_inject_handlers(app)
@@ -50,6 +50,19 @@ line-length=90
 [tool.pyright]
 typeCheckingMode = "strict"

+[[tool.pyright.executionEnvironments]]
+root = "tests/"
+reportPrivateUsage = false
+reportUnusedFunction = false
+
+[tool.coverage.run]
+branch = true
+omit = [
+    "src/argenta/app/protocols.py",
+    "src/argenta/*/exceptions.py",
+    "src/argenta/metrics/*"
+]
+
 [tool.mypy]
 disable_error_code = "import-untyped"

@@ -19,7 +19,6 @@ from argenta.app.protocols import (
 )
 from argenta.app.registered_routers.entity import RegisteredRouters
 from argenta.command.exceptions import (
-    EmptyInputCommandException,
    InputCommandException,
    RepeatedInputFlagsException,
    UnprocessedInputFlagException,
@@ -40,7 +39,7 @@ class BaseApp:
        initial_message: str,
        farewell_message: str,
        exit_command: Command,
-        system_router_title: str | None,
+        system_router_title: str,
        ignore_command_register: bool,
        dividing_line: StaticDividingLine | DynamicDividingLine,
        repeat_command_groups_printing: bool,
@@ -51,7 +50,7 @@ class BaseApp:
        self._prompt: str = prompt
        self._print_func: Printer = print_func
        self._exit_command: Command = exit_command
-        self._system_router_title: str | None = system_router_title
+        self._system_router_title: str = system_router_title
        self._dividing_line: StaticDividingLine | DynamicDividingLine = dividing_line
        self._ignore_command_register: bool = ignore_command_register
        self._repeat_command_groups_printing_description: bool = repeat_command_groups_printing
@@ -144,8 +143,7 @@ class BaseApp:
        :return: None
        """
        for registered_router in self.registered_routers:
-            if registered_router.title:
-                self._print_func(registered_router.title)
+            self._print_func(registered_router.title)
            for command_handler in registered_router.command_handlers:
                handled_command = command_handler.handled_command
                self._print_func(
@@ -239,7 +237,7 @@ class BaseApp:
            self._incorrect_input_syntax_handler(raw_command)
        elif isinstance(error, RepeatedInputFlagsException):
            self._repeated_input_flags_handler(raw_command)
-        elif isinstance(error, EmptyInputCommandException):
+        else:
            self._empty_input_command_handler()

    def _setup_system_router(self) -> None:
@@ -253,9 +251,8 @@ class BaseApp:
        def _(response: Response) -> None:
            self._exit_command_handler(response)

-        if system_router not in self.registered_routers.registered_routers:
-            system_router.command_register_ignore = self._ignore_command_register
-            self.registered_routers.add_registered_router(system_router)
+        system_router.command_register_ignore = self._ignore_command_register
+        self.registered_routers.add_registered_router(system_router)

    def _most_similar_command(self, unknown_command: str) -> str | None:
        all_commands = list(self._current_matching_triggers_with_routers.keys())
@@ -323,7 +320,7 @@ class BaseApp:
        for router_entity in self.registered_routers:
            router_triggers = router_entity.triggers
            router_aliases = router_entity.aliases
-            combined = router_triggers + router_aliases
+            combined = router_triggers | router_aliases

            for trigger in combined:
                self._matching_default_triggers_with_routers[trigger] = router_entity
@@ -331,15 +328,6 @@ class BaseApp:

        self._autocompleter.initial_setup(list(self._current_matching_triggers_with_routers.keys()))

-        seen = {}
-        for item in list(self._current_matching_triggers_with_routers.keys()):
-            if item in seen:
-                Console().print(
-                    f"\n[b red]WARNING:[/b red] Overlapping trigger or alias: [b blue]{item}[/b blue]"
-                )
-            else:
-                seen[item] = True
-
        if not self._override_system_messages:
            self._setup_default_view()

@@ -351,6 +339,28 @@ class BaseApp:
            print("\n")
        if not self._repeat_command_groups_printing_description:
            self._print_command_group_description()
+            
+    def _process_exist_and_valid_command(self, input_command: InputCommand) -> None:
+        processing_router = self._current_matching_triggers_with_routers[input_command.trigger.lower()]
+
+        if processing_router.disable_redirect_stdout:
+            dividing_line_unit_part: str = self._dividing_line.get_unit_part()
+            self._print_func(
+                StaticDividingLine(dividing_line_unit_part).get_full_static_line(
+                    is_override=self._override_system_messages
+                )
+            )
+            processing_router.finds_appropriate_handler(input_command)
+            self._print_func(
+                StaticDividingLine(dividing_line_unit_part).get_full_static_line(
+                    is_override=self._override_system_messages
+                )
+            )
+        else:
+            with redirect_stdout(io.StringIO()) as stdout:
+                processing_router.finds_appropriate_handler(input_command)
+                stdout_result: str = stdout.getvalue()
+            self._print_framed_text(stdout_result)


 AVAILABLE_DIVIDING_LINES: TypeAlias = StaticDividingLine | DynamicDividingLine
@@ -369,10 +379,10 @@ class App(BaseApp):
        initial_message: str = "Argenta\n",
        farewell_message: str = "\nSee you\n",
        exit_command: Command = DEFAULT_EXIT_COMMAND,
-        system_router_title: str | None = "System points:",
+        system_router_title: str = "System points:",
        ignore_command_register: bool = True,
        dividing_line: AVAILABLE_DIVIDING_LINES = DEFAULT_DIVIDING_LINE,
-        repeat_command_groups_printing: bool = True,
+        repeat_command_groups_printing: bool = False,
        override_system_messages: bool = False,
        autocompleter: AutoCompleter = DEFAULT_AUTOCOMPLETER,
        print_func: Printer = DEFAULT_PRINT_FUNC,
@@ -442,27 +452,7 @@ class App(BaseApp):
                self._print_framed_text(stdout_res)
                continue

-            processing_router = self._current_matching_triggers_with_routers[input_command.trigger.lower()]
-
-            if processing_router.disable_redirect_stdout:
-                dividing_line_unit_part: str = self._dividing_line.get_unit_part()
-                self._print_func(
-                    StaticDividingLine(dividing_line_unit_part).get_full_static_line(
-                        is_override=self._override_system_messages
-                    )
-                )
-                processing_router.finds_appropriate_handler(input_command)
-                self._print_func(
-                    StaticDividingLine(dividing_line_unit_part).get_full_static_line(
-                        is_override=self._override_system_messages
-                    )
-                )
-            else:
-                with redirect_stdout(io.StringIO()) as stdout:
-                    processing_router.finds_appropriate_handler(input_command)
-                    stdout_result: str = stdout.getvalue()
-                if stdout_result:
-                    self._print_framed_text(stdout_result)
+            self._process_exist_and_valid_command(input_command)

    def include_router(self, router: Router) -> None:
        """
@@ -2,11 +2,12 @@ __all__ = ["NonStandardBehaviorHandler", "EmptyCommandHandler", "Printer", "Desc

 from typing import Protocol, TypeVar

+
 T = TypeVar("T", contravariant=True)  # noqa: WPS111


 class NonStandardBehaviorHandler(Protocol[T]):
-    def __call__(self, __param: T) -> None:
+    def __call__(self, _param: T, /) -> None:
        raise NotImplementedError


@@ -16,10 +17,10 @@ class EmptyCommandHandler(Protocol):


 class Printer(Protocol):
-    def __call__(self, __text: str) -> None:
+    def __call__(self, _text: str, /) -> None:
        raise NotImplementedError


 class DescriptionMessageGenerator(Protocol):
-    def __call__(self, __first_param: str, __second_param: str) -> str:
+    def __call__(self, _command: str, _description: str, /) -> str:
        raise NotImplementedError
@@ -24,6 +24,3 @@ class RegisteredRouters:

    def __iter__(self) -> Iterator[Router]:
        return iter(self.registered_routers)
-
-    def __next__(self) -> Router:
-        return next(iter(self.registered_routers))
@@ -39,9 +39,6 @@ class BaseFlags(Generic[FlagType]):
    def __iter__(self) -> Iterator[FlagType]:
        return iter(self.flags)

-    def __next__(self) -> FlagType:
-        return next(iter(self))
-
    def __getitem__(self, flag_index: int) -> FlagType:
        return self.flags[flag_index]

@@ -61,7 +58,7 @@ class Flags(BaseFlags[Flag]):
    @override
    def __eq__(self, other: object) -> bool:
        if not isinstance(other, Flags):
-            return NotImplemented
+            return False

        if len(self.flags) != len(other.flags):
            return False
@@ -91,7 +88,7 @@ class InputFlags(BaseFlags[InputFlag]):
    @override
    def __eq__(self, other: object) -> bool:
        if not isinstance(other, InputFlags):
-            raise NotImplementedError
+            return False

        if len(self.flags) != len(other.flags):
            return False
@@ -43,20 +43,16 @@ class Flag:
        Private. Validates the input flag value
        :param input_flag_value: The input flag value to validate
        :return: whether the entered flag is valid as bool
-        """
-        if self.possible_values == PossibleValues.NEITHER:
-            return input_flag_value == ''
-            
-        if self.possible_values == PossibleValues.ALL:
+        """ 
+        if isinstance(self.possible_values, PossibleValues):
+            if self.possible_values == PossibleValues.NEITHER:
+                return input_flag_value == ''
            return input_flag_value != ''

        if isinstance(self.possible_values, Pattern):
            return bool(self.possible_values.match(input_flag_value))

-        if isinstance(self.possible_values, list):
-            return input_flag_value in self.possible_values
-            
-        return False
+        return input_flag_value in self.possible_values

    @property
    def string_entity(self) -> str:
@@ -88,9 +84,9 @@ class InputFlag:
        self,
        name: str,
        *,
-        prefix: PREFIX_TYPE = "--",
        input_value: str,
-        status: ValidationStatus | None,
+        prefix: PREFIX_TYPE = "--",
+        status: ValidationStatus | None = None,
    ):
        """
        Public. The entity of the flag of the entered command
@@ -17,7 +17,7 @@ ParseResult = tuple[str, InputFlags]
 MIN_FLAG_PREFIX: str = "-"
 PREFIX_TYPE = Literal["-", "--", "---"]
 DEFAULT_WITHOUT_FLAGS: Flags = Flags()
-DEFAULT_WITHOUT_ALIASES: list[Never] = []
+DEFAULT_WITHOUT_ALIASES: set[Never] = set()

 DEFAULT_WITHOUT_INPUT_FLAGS: InputFlags = InputFlags()

@@ -29,7 +29,7 @@ class Command:
        *,
        description: str = "Some useful command",
        flags: Flag | Flags = DEFAULT_WITHOUT_FLAGS,
-        aliases: list[str] | list[Never] = DEFAULT_WITHOUT_ALIASES,
+        aliases: set[str] | set[Never] = DEFAULT_WITHOUT_ALIASES,
    ):
        """
        Public. The command that can and should be registered in the Router
@@ -41,7 +41,7 @@ class Command:
        self.registered_flags: Flags = flags if isinstance(flags, Flags) else Flags([flags])
        self.trigger: str = trigger
        self.description: str = description
-        self.aliases: list[str] | list[Never] = aliases
+        self.aliases: set[str] | set[Never] = aliases

    def validate_input_flag(self, flag: InputFlag) -> ValidationStatus:
        """
@@ -104,9 +104,6 @@ class InputCommand:
            else:
                raise UnprocessedInputFlagException
            
-            if not name:
-                raise UnprocessedInputFlagException
-            
            if i + 1 < len(tokens) and not tokens[i + 1].startswith("-"):
                input_value = tokens[i + 1]
                i += 2
@@ -20,16 +20,16 @@ def inject(func: Callable[..., T]) -> Callable[..., T]:


 def setup_dishka(app: App, container: Container, *, auto_inject: bool = False) -> None:
+    Response.patch_by_container(container)
    if auto_inject:
        _auto_inject_handlers(app)
-    Response.patch_by_container(container)


 def _get_container_from_response(args: tuple[Any, ...], kwargs: dict[str, Any]) -> Container:
    for arg in args:
        if isinstance(arg, Response):
-            if hasattr(arg, "_dishka_container"):
-                return arg._dishka_container  # pyright: ignore[reportPrivateUsage]
+            if hasattr(arg, "__dishka_container__"):
+                return arg.__dishka_container__  # pyright: ignore[reportPrivateUsage]
            break
    raise RuntimeError("dishka container not found in Response")

@@ -9,7 +9,7 @@ from time import time
 from argenta import App


-def get_time_of_pre_cycle_setup(app: App) -> float:
+def get_time_of_pre_cycle_setup(app: App) -> float: 
    """
    Public. Return time of pre cycle setup
    :param app: app instance for testing time of pre cycle setup
@@ -94,7 +94,7 @@ class ArgParser:
            namespace=self._core.parse_args(), processed_args=self.processed_args
        )

-    def _register_args(self, processed_args: list[ValueArgument | BooleanArgument]) -> None:
+    def _register_args(self, processed_args: list[ValueArgument | BooleanArgument]) -> None: # pragma: no cover
        if sys.version_info >= (3, 13):
            for arg in processed_args:
                if isinstance(arg, BooleanArgument):
@@ -26,7 +26,7 @@ class Orchestrator:
        self._custom_providers: list[Provider] = custom_providers
        self._auto_inject_handlers: bool = auto_inject_handlers

-        self._arg_parser._parse_args()
+        self._arg_parser._parse_args()  # pyright: ignore[reportPrivateUsage]

    def start_polling(self, app: App) -> None:
        """
@@ -9,7 +9,7 @@ EMPTY_INPUT_FLAGS: InputFlags = InputFlags()


 class Response:
-    _dishka_container: Container
+    __dishka_container__: Container

    def __init__(
        self,
@@ -26,4 +26,4 @@ class Response:

    @classmethod
    def patch_by_container(cls, container: Container) -> None:
-        cls._dishka_container = container
+        cls.__dishka_container__ = container
@@ -44,6 +44,3 @@ class CommandHandlers:

    def __iter__(self) -> Iterator[CommandHandler]:
        return iter(self.command_handlers)
-
-    def __next__(self) -> CommandHandler:
-        return next(iter(self.command_handlers))
@@ -22,7 +22,7 @@ HandlerFunc: TypeAlias = Callable[..., None]
 class Router:
    def __init__(
        self,
-        title: str | None = "Default title",
+        title: str = "Default title",
        *,
        disable_redirect_stdout: bool = False,
    ):
@@ -36,11 +36,14 @@ class Router:
               which is ambiguous behavior and can lead to unexpected work
        :return: None
        """
-        self.title: str | None = title
+        self.title: str = title
        self.disable_redirect_stdout: bool = disable_redirect_stdout

        self.command_handlers: CommandHandlers = CommandHandlers()
        self.command_register_ignore: bool = False
+        
+        self.aliases: set[str] = set()
+        self.triggers: set[str] = set()

    def command(self, command: Command | str) -> Callable[[HandlerFunc], HandlerFunc]:
        """
@@ -53,7 +56,13 @@ class Router:
        else:
            redefined_command = command

-        _validate_command(redefined_command)
+        self._validate_command(redefined_command)
+    
+        if overlapping := (self.aliases | self.triggers) & redefined_command.aliases:
+            Console().print(f"\n[b red]WARNING:[/b red] Overlapping trigger or alias: [b blue]{overlapping}[/b blue]")
+        
+        self.aliases.update(redefined_command.aliases)
+        self.triggers.add(redefined_command.trigger)

        def decorator(func: HandlerFunc) -> HandlerFunc:
            _validate_func_args(func)
@@ -61,6 +70,20 @@ class Router:
            return func

        return decorator
+        
+    def _validate_command(self, command: Command) -> None:
+        """
+        Private. Validates the command registered in handler
+        :param command: validated command
+        :return: None if command is valid else raise exception
+        """
+        command_name: str = command.trigger
+        if command_name.find(" ") != -1:
+            raise TriggerContainSpacesException()
+        flags: Flags = command.registered_flags
+        flags_name: list[str] = [flag.string_entity.lower() for flag in flags]
+        if len(set(flags_name)) < len(flags_name):
+            raise RepeatedFlagNameException()

    def finds_appropriate_handler(self, input_command: InputCommand) -> None:
        """
@@ -105,40 +128,6 @@ class Router:
                response = Response(ResponseStatus.ALL_FLAGS_VALID)
                command_handler.handling(response)

-    @property
-    def triggers(self) -> list[str]:
-        """
-        Public. Gets registered triggers
-        :return: registered in router triggers as list[str]
-        """
-        all_triggers: list[str] = []
-        for command_handler in self.command_handlers:
-            all_triggers.append(command_handler.handled_command.trigger)
-        return all_triggers
-
-    @property
-    def aliases(self) -> list[str]:
-        """
-        Public. Gets registered aliases
-        :return: registered in router aliases as list[str]
-        """
-        all_aliases: list[str] = []
-        for command_handler in self.command_handlers:
-            if command_handler.handled_command.aliases:
-                all_aliases.extend(command_handler.handled_command.aliases)
-        return all_aliases
-
-
-class CommandDecorator:
-    def __init__(self, router_instance: Router, command: Command):
-        self.router: Router = router_instance
-        self.command: Command = command
-
-    def __call__(self, handler_func: Callable[..., None]) -> Callable[..., None]:
-        _validate_func_args(handler_func)
-        self.router.command_handlers.add_handler(CommandHandler(handler_func, self.command))
-        return handler_func
-

 def _structuring_input_flags(handled_command: Command, input_flags: InputFlags) -> Response:
    """
@@ -188,18 +177,4 @@ def _validate_func_args(func: Callable[..., None]) -> None:
                + f" [i]but[/i] [bold blue]{response_arg_annotation}[/bold blue] [i]is specified[/i]",
                highlight=False,
            )
-
-
-def _validate_command(command: Command) -> None:
-    """
-    Private. Validates the command registered in handler
-    :param command: validated command
-    :return: None if command is valid else raise exception
-    """
-    command_name: str = command.trigger
-    if command_name.find(" ") != -1:
-        raise TriggerContainSpacesException()
-    flags: Flags = command.registered_flags
-    flags_name: list[str] = [flag.string_entity.lower() for flag in flags]
-    if len(set(flags_name)) < len(flags_name):
-        raise RepeatedFlagNameException()
+    
@@ -20,7 +20,7 @@ class RequiredArgumentNotPassedException(Exception):

    @override
    def __str__(self) -> str:
-        return "Required argument not passed"
+        return "Required argument with type Response not passed"


 class TriggerContainSpacesException(Exception):
@@ -1,10 +1,8 @@
-import io
 import re
 import sys
-from unittest import TestCase
-from unittest.mock import MagicMock, patch
+from collections.abc import Iterator

-import _io
+import pytest

 from argenta import App, Orchestrator, Router
 from argenta.command import Command, PredefinedFlags
@@ -13,252 +11,255 @@ from argenta.command.flag.models import ValidationStatus
 from argenta.response import Response


-class PatchedArgvTestCase(TestCase):
-    def setUp(self):
-        super().setUp()
-        self.patcher = patch.object(sys, 'argv', ['program.py'])
-        self.mock_argv = self.patcher.start()
-        self.addCleanup(self.patcher.stop)
+@pytest.fixture(autouse=True)
+def patch_argv(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setattr(sys, 'argv', ['program.py'])


-class TestSystemHandlerNormalWork(PatchedArgvTestCase):
-    @patch("builtins.input", side_effect=["help", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_incorrect_command(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
+def _mock_input(inputs: Iterator[str]) -> str:
+    return next(inputs)

-        @router.command(Command('test'))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            print('test command')

-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        app.set_unknown_command_handler(lambda command: print(f'Unknown command: {command.trigger}'))
-        orchestrator.start_polling(app)
+# ============================================================================
+# Tests for empty input handling
+# ============================================================================

-        output = mock_stdout.getvalue()

-        self.assertIn("\nUnknown command: help\n", output)
+def test_empty_input_triggers_empty_command_handler(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()

+    @router.command(Command('test'))
+    def test(_response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        print('test command')

-    @patch("builtins.input", side_effect=["TeSt", "Q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_incorrect_command2(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    app.set_empty_command_handler(lambda: print('Empty input command'))
+    orchestrator.start_polling(app)

-        @router.command(Command('test'))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            print('test command')
+    output = capsys.readouterr().out

-        app = App(ignore_command_register=False,
-                  override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        app.set_unknown_command_handler(lambda command: print(f'Unknown command: {command.trigger}'))
-        orchestrator.start_polling(app)
+    assert "\nEmpty input command\n" in output

-        output = mock_stdout.getvalue()

-        self.assertIn('\nUnknown command: TeSt\n', output)
+# ============================================================================
+# Tests for unknown command handling
+# ============================================================================


-    @patch("builtins.input", side_effect=["test --help", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_correct_command_with_unregistered_flag(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
+def test_unknown_command_triggers_unknown_command_handler(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["help", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()

-        @router.command(Command('test'))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            undefined_flag = response.input_flags.get_flag_by_name('help')
-            if undefined_flag and undefined_flag.status == ValidationStatus.UNDEFINED:
-                print(f'test command with undefined flag: {undefined_flag.string_entity}')
+    @router.command(Command('test'))
+    def test(_response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        print('test command')

-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        orchestrator.start_polling(app)
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    app.set_unknown_command_handler(lambda command: print(f'Unknown command: {command.trigger}'))
+    orchestrator.start_polling(app)

-        output = mock_stdout.getvalue()
+    output = capsys.readouterr().out

-        self.assertIn('\ntest command with undefined flag: --help\n', output)
+    assert "\nUnknown command: help\n" in output


-    @patch("builtins.input", side_effect=["test --port 22", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_correct_command_with_unregistered_flag2(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
+def test_case_sensitive_command_triggers_unknown_command_handler(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["TeSt", "Q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()

-        @router.command(Command('test'))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            undefined_flag = response.input_flags.get_flag_by_name("port")
-            if undefined_flag and undefined_flag.status == ValidationStatus.UNDEFINED:
-                print(f'test command with undefined flag with value: {undefined_flag.string_entity} {undefined_flag.input_value}')
-            else:
-                raise
+    @router.command(Command('test'))
+    def test(_response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        print('test command')

-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        orchestrator.start_polling(app)
+    app = App(ignore_command_register=False, override_system_messages=True, print_func=print)
+    app.include_router(router)
+    app.set_unknown_command_handler(lambda command: print(f'Unknown command: {command.trigger}'))
+    orchestrator.start_polling(app)

-        output = mock_stdout.getvalue()
+    output = capsys.readouterr().out

-        self.assertIn('\ntest command with undefined flag with value: --port 22\n', output)
+    assert '\nUnknown command: TeSt\n' in output


-    @patch("builtins.input", side_effect=["test --host 192.168.32.1 --port 132", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_correct_command_with_one_correct_flag_an_one_incorrect_flag(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
-        flags = Flags([PredefinedFlags.HOST])
+def test_mixed_valid_and_unknown_commands_handled_correctly(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["test", "some", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()

-        @router.command(Command('test', flags=flags))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            undefined_flag = response.input_flags.get_flag_by_name("port")
-            if undefined_flag and undefined_flag.status == ValidationStatus.UNDEFINED:
-                print(f'connecting to host with flag: {undefined_flag.string_entity} {undefined_flag.input_value}')
+    @router.command(Command('test'))
+    def test(_response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        print('test command')

-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        orchestrator.start_polling(app)
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    app.set_unknown_command_handler(lambda command: print(f'Unknown command: {command.trigger}'))
+    orchestrator.start_polling(app)

-        output = mock_stdout.getvalue()
+    output = capsys.readouterr().out

-        self.assertIn('\nconnecting to host with flag: --port 132\n', output)
+    assert re.search(r'\ntest command\n(.|\n)*\nUnknown command: some', output)


-    @patch("builtins.input", side_effect=["test", "some", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_one_correct_command_and_one_incorrect_command(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
+def test_multiple_commands_with_unknown_command_in_between(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["test", "some", "more", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()

-        @router.command(Command('test'))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            print(f'test command')
+    @router.command(Command('test'))
+    def test(_response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        print('test command')

-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        app.set_unknown_command_handler(lambda command: print(f'Unknown command: {command.trigger}'))
-        orchestrator.start_polling(app)
+    @router.command(Command('more'))
+    def test1(_response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        print('more command')

-        output = mock_stdout.getvalue()
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    app.set_unknown_command_handler(lambda command: print(f'Unknown command: {command.trigger}'))
+    orchestrator.start_polling(app)

-        self.assertRegex(output, re.compile(r'\ntest command\n(.|\n)*\nUnknown command: some'))
+    output = capsys.readouterr().out

+    assert re.search(r'\ntest command\n(.|\n)*\nUnknown command: some\n(.|\n)*\nmore command', output)

-    @patch("builtins.input", side_effect=["test", "some", "more", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_two_correct_commands_and_one_incorrect_command(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()

-        @router.command(Command('test'))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            print(f'test command')
+# ============================================================================
+# Tests for unregistered flag handling
+# ============================================================================

-        @router.command(Command('more'))
-        def test1(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            print(f'more command')

-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        app.set_unknown_command_handler(lambda command: print(f'Unknown command: {command.trigger}'))
-        orchestrator.start_polling(app)
+def test_unregistered_flag_without_value_is_accessible(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["test --help", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()

-        output = mock_stdout.getvalue()
+    @router.command(Command('test'))
+    def test(response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        undefined_flag = response.input_flags.get_flag_by_name('help')
+        if undefined_flag and undefined_flag.status == ValidationStatus.UNDEFINED:
+            print(f'test command with undefined flag: {undefined_flag.string_entity}')

-        self.assertRegex(output, re.compile(r'\ntest command\n(.|\n)*\nUnknown command: some\n(.|\n)*\nmore command'))
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    orchestrator.start_polling(app)

+    output = capsys.readouterr().out

-    @patch("builtins.input", side_effect=["test 535 --port", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_correct_command_with_incorrect_flag(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
+    assert '\ntest command with undefined flag: --help\n' in output

-        @router.command(Command('test'))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            print(f'test command')

-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        app.set_incorrect_input_syntax_handler(lambda command: print(f'Incorrect flag syntax: "{command}"'))
-        orchestrator.start_polling(app)
+def test_unregistered_flag_with_value_is_accessible(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["test --port 22", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()

-        output = mock_stdout.getvalue()
+    @router.command(Command('test'))
+    def test(response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        undefined_flag = response.input_flags.get_flag_by_name("port")
+        if undefined_flag and undefined_flag.status == ValidationStatus.UNDEFINED:
+            print(f'test command with undefined flag with value: {undefined_flag.string_entity} {undefined_flag.input_value}')
+        else:
+            raise

-        self.assertIn("\nIncorrect flag syntax: \"test 535 --port\"\n", output)
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    orchestrator.start_polling(app)

+    output = capsys.readouterr().out

-    @patch("builtins.input", side_effect=["", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_empty_command(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
+    assert '\ntest command with undefined flag with value: --port 22\n' in output

-        @router.command(Command('test'))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            print(f'test command')

-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        app.set_empty_command_handler(lambda: print('Empty input command'))
-        orchestrator.start_polling(app)
+def test_registered_and_unregistered_flags_coexist(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["test --host 192.168.32.1 --port 132", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()
+    flags = Flags([PredefinedFlags.HOST])

-        output = mock_stdout.getvalue()
+    @router.command(Command('test', flags=flags))
+    def test(response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        undefined_flag = response.input_flags.get_flag_by_name("port")
+        if undefined_flag and undefined_flag.status == ValidationStatus.UNDEFINED:
+            print(f'connecting to host with flag: {undefined_flag.string_entity} {undefined_flag.input_value}')

-        self.assertIn("\nEmpty input command\n", output)
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    orchestrator.start_polling(app)

+    output = capsys.readouterr().out

-    @patch("builtins.input", side_effect=["test --port 22 --port 33", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_correct_command_with_repeated_flags(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
+    assert '\nconnecting to host with flag: --port 132\n' in output

-        @router.command(Command('test', flags=PredefinedFlags.PORT))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            print('test command')

-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        app.set_repeated_input_flags_handler(lambda command: print(f'Repeated input flags: "{command}"'))
-        orchestrator.start_polling(app)
+# ============================================================================
+# Tests for incorrect flag syntax handling
+# ============================================================================

-        output = mock_stdout.getvalue()

-        self.assertIn('Repeated input flags: "test --port 22 --port 33"', output)
+def test_flag_without_value_triggers_incorrect_syntax_handler(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["test 535 --port", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()

-    @patch("builtins.input", side_effect=["test --help", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_correct_command_with_unregistered_flag3(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
+    @router.command(Command('test'))
+    def test(_response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        print('test command')

-        @router.command(Command('test'))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            undefined_flag = response.input_flags.get_flag_by_name('help')
-            if undefined_flag and undefined_flag.status == ValidationStatus.UNDEFINED:
-                print(f'test command with undefined flag: {undefined_flag.string_entity}')
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    app.set_incorrect_input_syntax_handler(lambda command: print(f'Incorrect flag syntax: "{command}"'))
+    orchestrator.start_polling(app)

-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        orchestrator.start_polling(app)
+    output = capsys.readouterr().out

-        output = mock_stdout.getvalue()
+    assert "\nIncorrect flag syntax: \"test 535 --port\"\n" in output

-        self.assertIn('\ntest command with undefined flag: --help\n', output)
+
+# ============================================================================
+# Tests for repeated flag handling
+# ============================================================================
+
+
+def test_repeated_flags_trigger_repeated_flags_handler(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["test --port 22 --port 33", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()
+
+    @router.command(Command('test', flags=PredefinedFlags.PORT))
+    def test(_response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        print('test command')
+
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    app.set_repeated_input_flags_handler(lambda command: print(f'Repeated input flags: "{command}"'))
+    orchestrator.start_polling(app)
+
+    output = capsys.readouterr().out
+
+    assert 'Repeated input flags: "test --port 22 --port 33"' in output
@@ -1,10 +1,8 @@
-import io
 import re
 import sys
-from unittest import TestCase
-from unittest.mock import MagicMock, patch
+from collections.abc import Iterator

-import _io
+import pytest

 from argenta import App, Orchestrator, Router
 from argenta.command import Command, PredefinedFlags
@@ -14,241 +12,261 @@ from argenta.command.flag.models import PossibleValues, ValidationStatus
 from argenta.response import Response


-class PatchedArgvTestCase(TestCase):
-    def setUp(self):
-        super().setUp()
-        self.patcher = patch.object(sys, 'argv', ['program.py'])
-        self.mock_argv = self.patcher.start()
-        self.addCleanup(self.patcher.stop)
+@pytest.fixture(autouse=True)
+def patch_argv(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setattr(sys, 'argv', ['program.py'])


-class TestSystemHandlerNormalWork(PatchedArgvTestCase):
-    @patch("builtins.input", side_effect=["test", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_correct_command(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
-
-        @router.command(Command('test'))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            print('test command')
-
-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        orchestrator.start_polling(app)
-
-        output = mock_stdout.getvalue()
-
-        self.assertIn('\ntest command\n', output)
+def _mock_input(inputs: Iterator[str]) -> str:
+    return next(inputs)


-    @patch("builtins.input", side_effect=["TeSt", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_correct_command2(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
-
-        @router.command(Command('test'))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            print('test command')
-
-        app = App(ignore_command_register=True,
-                  override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        orchestrator.start_polling(app)
-
-        output = mock_stdout.getvalue()
-
-        self.assertIn('\ntest command\n', output)
+# ============================================================================
+# Tests for basic command execution
+# ============================================================================


-    @patch("builtins.input", side_effect=["test --help", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_correct_command_with_custom_flag(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
-        flag = Flag('help', prefix='--', possible_values=PossibleValues.NEITHER)
+def test_simple_command_executes_successfully(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["test", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()

-        @router.command(Command('test', flags=flag))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            valid_flag = response.input_flags.get_flag_by_name('help')
-            if valid_flag and valid_flag.status == ValidationStatus.VALID:
-                print(f'\nhelp for {valid_flag.name} flag\n')
+    @router.command(Command('test'))
+    def test(_response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        print('test command')

-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        orchestrator.start_polling(app)
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    orchestrator.start_polling(app)

-        output = mock_stdout.getvalue()
+    output = capsys.readouterr().out

-        self.assertIn('\nhelp for help flag\n', output)
-
-    @patch("builtins.input", side_effect=["test --port 22", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_correct_command_with_custom_flag2(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
-        flag = Flag('port', prefix='--', possible_values=re.compile(r'^\d{1,5}$'))
-
-        @router.command(Command('test', flags=flag))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            valid_flag = response.input_flags.get_flag_by_name('port')
-            if valid_flag and valid_flag.status == ValidationStatus.VALID:
-                print(f'flag value for {valid_flag.name} flag : {valid_flag.input_value}')
-
-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        orchestrator.start_polling(app)
-
-        output = mock_stdout.getvalue()
-
-        self.assertIn('\nflag value for port flag : 22\n', output)
+    assert '\ntest command\n' in output


-    @patch("builtins.input", side_effect=["test -H", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_correct_command_with_default_flag(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
-        flag = PredefinedFlags.SHORT_HELP
+def test_case_insensitive_command_executes_when_enabled(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["TeSt", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()

-        @router.command(Command('test', flags=flag))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            valid_flag = response.input_flags.get_flag_by_name('H')
-            if valid_flag and valid_flag.status == ValidationStatus.VALID:
-                print(f'help for {valid_flag.name} flag')
+    @router.command(Command('test'))
+    def test(_response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        print('test command')

-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        orchestrator.start_polling(app)
+    app = App(ignore_command_register=True, override_system_messages=True, print_func=print)
+    app.include_router(router)
+    orchestrator.start_polling(app)

-        output = mock_stdout.getvalue()
+    output = capsys.readouterr().out

-        self.assertIn('\nhelp for H flag\n', output)
+    assert '\ntest command\n' in output


-    @patch("builtins.input", side_effect=["test --info", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_correct_command_with_default_flag2(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
-        flag = PredefinedFlags.INFO
+def test_two_commands_execute_sequentially(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["test", "some", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()

-        @router.command(Command('test', flags=flag))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            valid_flag = response.input_flags.get_flag_by_name('info')
-            if valid_flag and valid_flag.status == ValidationStatus.VALID:
-                print('info about test command')
+    @router.command(Command('test'))
+    def test(_response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        print('test command')

-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        orchestrator.start_polling(app)
+    @router.command(Command('some'))
+    def test2(_response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        print('some command')

-        output = mock_stdout.getvalue()
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    orchestrator.start_polling(app)

-        self.assertIn('\ninfo about test command\n', output)
+    output = capsys.readouterr().out
+
+    assert re.search(r'\ntest command\n(.|\n)*\nsome command\n', output)


-    @patch("builtins.input", side_effect=["test --host 192.168.0.1", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_correct_command_with_default_flag3(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
-        flag = PredefinedFlags.HOST
+def test_three_commands_execute_sequentially(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["test", "some", "more", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()

-        @router.command(Command('test', flags=flag))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            valid_flag = response.input_flags.get_flag_by_name('host')
-            if valid_flag and valid_flag.status == ValidationStatus.VALID:
-                print(f'connecting to host {valid_flag.input_value}')
+    @router.command(Command('test'))
+    def test(_response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        print('test command')

-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        orchestrator.start_polling(app)
+    @router.command(Command('some'))
+    def test1(_response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        print('some command')

-        output = mock_stdout.getvalue()
+    @router.command(Command('more'))
+    def test2(_response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        print('more command')

-        self.assertIn('\nconnecting to host 192.168.0.1\n', output)
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    orchestrator.start_polling(app)
+
+    output = capsys.readouterr().out
+
+    assert re.search(r'\ntest command\n(.|\n)*\nsome command\n(.|\n)*\nmore command', output)


-    @patch("builtins.input", side_effect=["test --host 192.168.32.1 --port 132", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_correct_command_with_two_flags(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
-        flags = Flags([PredefinedFlags.HOST, PredefinedFlags.PORT])
-
-        @router.command(Command('test', flags=flags))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            host_flag = response.input_flags.get_flag_by_name('host')
-            port_flag = response.input_flags.get_flag_by_name('port')
-            if (host_flag and host_flag.status == ValidationStatus.VALID) and (port_flag and port_flag.status == ValidationStatus.VALID):
-                print(f'connecting to host {host_flag.input_value} and port {port_flag.input_value}')
-
-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        orchestrator.start_polling(app)
-
-        output = mock_stdout.getvalue()
-
-        self.assertIn('\nconnecting to host 192.168.32.1 and port 132\n', output)
+# ============================================================================
+# Tests for custom flag handling
+# ============================================================================


-    @patch("builtins.input", side_effect=["test", "some", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_two_correct_command(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
+def test_custom_flag_without_value_is_recognized(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["test --help", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()
+    flag = Flag('help', prefix='--', possible_values=PossibleValues.NEITHER)

-        @router.command(Command('test'))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            print(f'test command')
+    @router.command(Command('test', flags=flag))
+    def test(response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        valid_flag = response.input_flags.get_flag_by_name('help')
+        if valid_flag and valid_flag.status == ValidationStatus.VALID:
+            print(f'\nhelp for {valid_flag.name} flag\n')

-        @router.command(Command('some'))
-        def test2(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            print(f'some command')
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    orchestrator.start_polling(app)

-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        orchestrator.start_polling(app)
+    output = capsys.readouterr().out

-        output = mock_stdout.getvalue()
-
-        self.assertRegex(output, re.compile(r'\ntest command\n(.|\n)*\nsome command\n'))
+    assert '\nhelp for help flag\n' in output


-    @patch("builtins.input", side_effect=["test", "some", "more", "q"])
-    @patch("sys.stdout", new_callable=io.StringIO)
-    def test_input_three_correct_command(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
-        router = Router()
-        orchestrator = Orchestrator()
+def test_custom_flag_with_regex_validation_accepts_valid_value(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["test --port 22", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()
+    flag = Flag('port', prefix='--', possible_values=re.compile(r'^\d{1,5}$'))

-        @router.command(Command('test'))
-        def test(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            print(f'test command')
+    @router.command(Command('test', flags=flag))
+    def test(response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        valid_flag = response.input_flags.get_flag_by_name('port')
+        if valid_flag and valid_flag.status == ValidationStatus.VALID:
+            print(f'flag value for {valid_flag.name} flag : {valid_flag.input_value}')

-        @router.command(Command('some'))
-        def test1(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            print(f'some command')
+    app = App(override_system_messages=True, repeat_command_groups_printing=True, print_func=print)
+    app.include_router(router)
+    orchestrator.start_polling(app)

-        @router.command(Command('more'))
-        def test2(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            print(f'more command')
+    output = capsys.readouterr().out

-        app = App(override_system_messages=True,
-                  print_func=print)
-        app.include_router(router)
-        orchestrator.start_polling(app)
+    assert '\nflag value for port flag : 22\n' in output

-        output = mock_stdout.getvalue()

-        self.assertRegex(output, re.compile(r'\ntest command\n(.|\n)*\nsome command\n(.|\n)*\nmore command'))
+# ============================================================================
+# Tests for predefined flag handling
+# ============================================================================
+
+
+def test_predefined_short_help_flag_is_recognized(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["test -H", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()
+    flag = PredefinedFlags.SHORT_HELP
+
+    @router.command(Command('test', flags=flag))
+    def test(response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        valid_flag = response.input_flags.get_flag_by_name('H')
+        if valid_flag and valid_flag.status == ValidationStatus.VALID:
+            print(f'help for {valid_flag.name} flag')
+
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    orchestrator.start_polling(app)
+
+    output = capsys.readouterr().out
+
+    assert '\nhelp for H flag\n' in output
+
+
+def test_predefined_info_flag_is_recognized(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["test --info", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()
+    flag = PredefinedFlags.INFO
+
+    @router.command(Command('test', flags=flag))
+    def test(response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        valid_flag = response.input_flags.get_flag_by_name('info')
+        if valid_flag and valid_flag.status == ValidationStatus.VALID:
+            print('info about test command')
+
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    orchestrator.start_polling(app)
+
+    output = capsys.readouterr().out
+
+    assert '\ninfo about test command\n' in output
+
+
+def test_predefined_host_flag_with_value_is_recognized(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["test --host 192.168.0.1", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()
+    flag = PredefinedFlags.HOST
+
+    @router.command(Command('test', flags=flag))
+    def test(response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        valid_flag = response.input_flags.get_flag_by_name('host')
+        if valid_flag and valid_flag.status == ValidationStatus.VALID:
+            print(f'connecting to host {valid_flag.input_value}')
+
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    orchestrator.start_polling(app)
+
+    output = capsys.readouterr().out
+
+    assert '\nconnecting to host 192.168.0.1\n' in output
+
+
+# ============================================================================
+# Tests for multiple flag handling
+# ============================================================================
+
+
+def test_two_predefined_flags_are_recognized_together(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    inputs = iter(["test --host 192.168.32.1 --port 132", "q"])
+    monkeypatch.setattr('builtins.input', lambda _prompt="": _mock_input(inputs))
+    
+    router = Router()
+    orchestrator = Orchestrator()
+    flags = Flags([PredefinedFlags.HOST, PredefinedFlags.PORT])
+
+    @router.command(Command('test', flags=flags))
+    def test(response: Response) -> None:  # pyright: ignore[reportUnusedFunction]
+        host_flag = response.input_flags.get_flag_by_name('host')
+        port_flag = response.input_flags.get_flag_by_name('port')
+        if (host_flag and host_flag.status == ValidationStatus.VALID) and (port_flag and port_flag.status == ValidationStatus.VALID):
+            print(f'connecting to host {host_flag.input_value} and port {port_flag.input_value}')
+
+    app = App(override_system_messages=True, print_func=print)
+    app.include_router(router)
+    orchestrator.start_polling(app)
+
+    output = capsys.readouterr().out
+
+    assert '\nconnecting to host 192.168.32.1 and port 132\n' in output
@@ -1,74 +1,640 @@
-import unittest
+import pytest
+from pytest import CaptureFixture

 from argenta.app import App
+from argenta.app.dividing_line import DynamicDividingLine, StaticDividingLine
+from argenta.app.protocols import DescriptionMessageGenerator, NonStandardBehaviorHandler
 from argenta.command.models import Command, InputCommand
+from argenta.response import Response
+from argenta.response.status import ResponseStatus
 from argenta.router import Router


-class MyTestCase(unittest.TestCase):
-    def test_is_exit_command1(self):
-        app = App()
-        self.assertEqual(app._is_exit_command(InputCommand('q')), True)
-
-    def test_is_exit_command5(self):
-        app = App()
-        self.assertEqual(app._is_exit_command(InputCommand('Q')), True)
-
-    def test_is_exit_command2(self):
-        app = App(ignore_command_register=False)
-        self.assertEqual(app._is_exit_command(InputCommand('q')), False)
-
-    def test_is_exit_command3(self):
-        app = App(exit_command=Command('quit'))
-        self.assertEqual(app._is_exit_command(InputCommand('quit')), True)
-
-    def test_is_exit_command4(self):
-        app = App(exit_command=Command('quit'))
-        self.assertEqual(app._is_exit_command(InputCommand('qUIt')), True)
-
-    def test_is_exit_command6(self):
-        app = App(ignore_command_register=False,
-                  exit_command=Command('quit'))
-        self.assertEqual(app._is_exit_command(InputCommand('qUIt')), False)
-
-    def test_is_unknown_command1(self):
-        app = App()
-        app.set_unknown_command_handler(lambda command: None)
-        app._current_matching_triggers_with_routers = {'fr': Router(), 'tr': Router(), 'de': Router()}
-        self.assertEqual(app._is_unknown_command(InputCommand('fr')), False)
-
-    def test_is_unknown_command2(self):
-        app = App()
-        app.set_unknown_command_handler(lambda command: None)
-        app._current_matching_triggers_with_routers = {'fr': Router(), 'tr': Router(), 'de': Router()}
-        self.assertEqual(app._is_unknown_command(InputCommand('cr')), True)
-
-    def test_is_unknown_command3(self):
-        app = App(ignore_command_register=False)
-        app.set_unknown_command_handler(lambda command: None)
-        app._current_matching_triggers_with_routers = {'Pr': Router(), 'tW': Router(), 'deQW': Router()}
-        self.assertEqual(app._is_unknown_command(InputCommand('pr')), True)
-
-    def test_is_unknown_command4(self):
-        app = App(ignore_command_register=False)
-        app.set_unknown_command_handler(lambda command: None)
-        app._current_matching_triggers_with_routers = {'Pr': Router(), 'tW': Router(), 'deQW': Router()}
-        self.assertEqual(app._is_unknown_command(InputCommand('tW')), False)
+# ============================================================================
+# Tests for exit command detection
+# ============================================================================


+def test_default_exit_command_lowercase_q_is_recognized() -> None:
+    app = App()
+    assert app._is_exit_command(InputCommand('q')) is True


+def test_default_exit_command_uppercase_q_is_recognized() -> None:
+    app = App()
+    assert app._is_exit_command(InputCommand('Q')) is True


+def test_exit_command_not_recognized_when_case_sensitivity_enabled() -> None:
+    app = App(ignore_command_register=False)
+    assert app._is_exit_command(InputCommand('q')) is False


+def test_custom_exit_command_is_recognized() -> None:
+    app = App(exit_command=Command('quit'))
+    assert app._is_exit_command(InputCommand('quit')) is True


+def test_custom_exit_command_case_insensitive_by_default() -> None:
+    app = App(exit_command=Command('quit'))
+    assert app._is_exit_command(InputCommand('qUIt')) is True


+def test_custom_exit_command_case_sensitive_when_enabled() -> None:
+    app = App(ignore_command_register=False, exit_command=Command('quit'))
+    assert app._is_exit_command(InputCommand('qUIt')) is False


+def test_exit_command_alias_is_recognized() -> None:
+    app = App(exit_command=Command('q', aliases={'exit'}))
+    assert app._is_exit_command(InputCommand('exit')) is True


+def test_exit_command_alias_case_sensitive_when_enabled() -> None:
+    app = App(exit_command=Command('q', aliases={'exit'}), ignore_command_register=False)
+    assert app._is_exit_command(InputCommand('exit')) is True


+def test_non_exit_command_is_not_recognized() -> None:
+    app = App(exit_command=Command('q', aliases={'exit'}))
+    assert app._is_exit_command(InputCommand('quit')) is False
+
+
+def test_non_exit_command_with_wrong_case_is_not_recognized() -> None:
+    app = App(exit_command=Command('q', aliases={'exit'}), ignore_command_register=False)
+    assert app._is_exit_command(InputCommand('Exit')) is False
+
+
+# ============================================================================
+# Tests for unknown command detection
+# ============================================================================
+
+
+def test_registered_command_is_not_unknown() -> None:
+    app = App()
+    app.set_unknown_command_handler(lambda command: None)
+    app._current_matching_triggers_with_routers = {'fr': Router(), 'tr': Router(), 'de': Router()}
+    assert app._is_unknown_command(InputCommand('fr')) is False
+
+
+def test_unregistered_command_is_unknown() -> None:
+    app = App()
+    app.set_unknown_command_handler(lambda command: None)
+    app._current_matching_triggers_with_routers = {'fr': Router(), 'tr': Router(), 'de': Router()}
+    assert app._is_unknown_command(InputCommand('cr')) is True
+
+
+def test_command_with_wrong_case_is_unknown_when_case_sensitivity_enabled() -> None:
+    app = App(ignore_command_register=False)
+    app.set_unknown_command_handler(lambda command: None)
+    app._current_matching_triggers_with_routers = {'Pr': Router(), 'tW': Router(), 'deQW': Router()}
+    assert app._is_unknown_command(InputCommand('pr')) is True
+
+
+def test_command_with_exact_case_is_not_unknown_when_case_sensitivity_enabled() -> None:
+    app = App(ignore_command_register=False)
+    app.set_unknown_command_handler(lambda command: None)
+    app._current_matching_triggers_with_routers = {'Pr': Router(), 'tW': Router(), 'deQW': Router()}
+    assert app._is_unknown_command(InputCommand('tW')) is False
+
+
+# ============================================================================
+# Tests for similar command suggestions
+# ============================================================================
+
+
+def test_most_similar_command_finds_closest_match() -> None:
+    app = App(override_system_messages=True)
+    router = Router()
+
+    @router.command(Command('port', aliases={'p'}))
+    def handler(_res: Response) -> None:
+        pass
+
+    @router.command(Command('host', aliases={'h'}))
+    def handler2(_res: Response) -> None:
+        pass
+
+    app.include_routers(router)
+    app._pre_cycle_setup()
+    
+    assert app._most_similar_command('por') == 'port'
+
+
+def test_most_similar_command_prefers_shorter_match() -> None:
+    app = App(override_system_messages=True)
+    router = Router()
+
+    @router.command(Command('command'))
+    def handler(_res: Response) -> None:
+        pass
+
+    @router.command(Command('command_other'))
+    def handler2(_res: Response) -> None:
+        pass
+
+    app.include_routers(router)
+    app._pre_cycle_setup()
+    
+    assert app._most_similar_command('com') == 'command'
+
+
+def test_most_similar_command_finds_longer_match_when_closer() -> None:
+    app = App(override_system_messages=True)
+    router = Router()
+
+    @router.command(Command('command'))
+    def handler(_res: Response) -> None:
+        pass
+
+    @router.command(Command('command_other'))
+    def handler2(_res: Response) -> None:
+        pass
+
+    app.include_routers(router)
+    app._pre_cycle_setup()
+    
+    assert app._most_similar_command('command_') == 'command_other'
+
+
+def test_most_similar_command_returns_none_for_no_match() -> None:
+    app = App(override_system_messages=True)
+    router = Router()
+
+    @router.command(Command('command'))
+    def handler(_res: Response) -> None:
+        pass
+
+    @router.command(Command('command_other'))
+    def handler2(_res: Response) -> None:
+        pass
+
+    app.include_routers(router)
+    app._pre_cycle_setup()
+    
+    assert app._most_similar_command('nonexists') is None
+
+
+def test_most_similar_command_matches_aliases() -> None:
+    app = App(override_system_messages=True)
+    router = Router()
+
+    @router.command(Command('command', aliases={'other_name'}))
+    def handler(_res: Response) -> None:
+        pass
+
+    @router.command(Command('command_other', aliases={'more_name'}))
+    def handler2(_res: Response) -> None:
+        pass
+
+    app.include_routers(router)
+    app._pre_cycle_setup()
+    
+    assert app._most_similar_command('othe') == 'other_name'
+
+
+# ============================================================================
+# Tests for router registration
+# ============================================================================
+
+
+def test_include_routers_registers_multiple_routers() -> None:
+    app = App()
+    router = Router()
+    router2 = Router()
+    app.include_routers(router, router2)
+
+    assert app.registered_routers.registered_routers == [router, router2]
+
+
+def test_overlapping_aliases_prints_warning(capsys: CaptureFixture[str]) -> None:
+    app = App(override_system_messages=True)
+    router = Router()
+
+    @router.command(Command('test', aliases={'alias'}))
+    def handler(_res: Response) -> None:
+        pass
+
+    @router.command(Command('test2', aliases={'alias'}))
+    def handler2(_res: Response) -> None:
+        pass
+
+    app.include_routers(router)
+    app._pre_cycle_setup()
+
+    captured = capsys.readouterr()
+
+    assert "Overlapping" in captured.out
+
+
+# ============================================================================
+# Tests for startup messages
+# ============================================================================
+
+
+def test_add_message_on_startup_stores_message() -> None:
+    app = App()
+    app.add_message_on_startup('Some message')
+    assert app._messages_on_startup == ['Some message']
+
+
+def test_pre_cycle_setup_prints_startup_messages(capsys: CaptureFixture[str]) -> None:
+    app = App()
+    app.add_message_on_startup('some message')
+    app._pre_cycle_setup()
+    stdout = capsys.readouterr()
+    
+    assert 'some message' in stdout.out
+
+
+# ============================================================================
+# Tests for framed text printing
+# ============================================================================
+
+
+def test_print_framed_text_with_static_dividing_line(capsys: CaptureFixture[str]) -> None:
+    app = App(override_system_messages=True, dividing_line=StaticDividingLine(length=5))
+    app._print_framed_text('test')
+
+    captured = capsys.readouterr()
+
+    assert '\n-----\n\ntest\n\n-----\n' in captured.out
+
+
+def test_print_framed_text_with_dynamic_dividing_line_short_text(capsys: CaptureFixture[str]) -> None:
+    app = App(override_system_messages=True, dividing_line=DynamicDividingLine())
+    app._print_framed_text('some long test')
+
+    captured = capsys.readouterr()
+
+    assert '\n--------------\n\nsome long test\n\n--------------\n' in captured.out
+
+
+def test_print_framed_text_with_dynamic_dividing_line_long_text(capsys: CaptureFixture[str]) -> None:
+    app = App(override_system_messages=True, dividing_line=DynamicDividingLine())
+    app._print_framed_text('test as test as test')
+
+    captured = capsys.readouterr()
+
+    assert '\n' + '-'*20 + '\n\ntest as test as test\n\n' + '-'*20 + '\n' in captured.out
+
+
+def test_print_framed_text_with_unsupported_dividing_line_raises_error() -> None:
+    class OtherDividingLine:
+        pass
+        
+    app = App(override_system_messages=True, dividing_line=OtherDividingLine())  # pyright: ignore[reportArgumentType]
+    
+    with pytest.raises(NotImplementedError):
+        app._print_framed_text('some long test')
+
+
+# ============================================================================
+# Tests for handler configuration
+# ============================================================================
+
+
+def test_set_description_message_pattern_stores_generator() -> None:
+    app = App()
+    descr_gen: DescriptionMessageGenerator = lambda command, description: command + '-+-' + description
+    app.set_description_message_pattern(descr_gen)
+    
+    assert app._description_message_gen is descr_gen
+
+
+def test_set_exit_command_handler_stores_handler() -> None:
+    app = App()
+    handler: NonStandardBehaviorHandler[Response] = lambda response: print('goodbye')
+    app.set_exit_command_handler(handler)
+    
+    assert app._exit_command_handler is handler
+
+
+# ============================================================================
+# Tests for default view setup
+# ============================================================================
+
+
+def test_setup_default_view_formats_prompt() -> None:
+    app = App(prompt='>>')
+    app._setup_default_view()
+    
+    assert app._prompt == '[italic dim bold]>>'
+
+
+def test_setup_default_view_sets_default_unknown_command_handler() -> None:
+    app = App()
+    app._setup_default_view()
+    assert app._unknown_command_handler(InputCommand('nonexists')) is None
+
+
+# ============================================================================
+# Tests for command processing
+# ============================================================================
+
+
+def test_process_command_with_router_with_disabled_stdout_redirect(capsys: CaptureFixture[str]) -> None:
+    app = App(repeat_command_groups_printing=True)
+    router = Router(disable_redirect_stdout=True)
+    
+    @router.command('command')
+    def handler(_res: Response) -> None:
+        print("Hello!")
+        
+    app.include_router(router)
+    
+    app._pre_cycle_setup()
+    app._process_exist_and_valid_command(InputCommand('command'))
+    
+    stdout = capsys.readouterr()
+    
+    assert 'Hello!' in stdout.out
+
+
+# ============================================================================
+# Tests for handler setters and execution
+# ============================================================================
+
+
+def test_set_unknown_command_handler_stores_handler() -> None:
+    app = App()
+    call_tracker = {'called': False}
+    
+    def custom_handler(_command: InputCommand) -> None:
+        call_tracker['called'] = True
+    
+    app.set_unknown_command_handler(custom_handler)
+    app._unknown_command_handler(InputCommand('test'))
+    
+    assert call_tracker['called']
+
+
+def test_set_exit_handler_stores_handler() -> None:
+    app = App()
+    call_tracker = {'called': False}
+    
+    def custom_handler(_response: Response) -> None:
+        call_tracker['called'] = True
+    
+    app.set_exit_command_handler(custom_handler)
+    app._exit_command_handler(Response(ResponseStatus.ALL_FLAGS_VALID))
+    
+    assert call_tracker['called']
+
+
+def test_set_empty_command_handler_stores_handler() -> None:
+    app = App()
+    call_tracker = {'called': False}
+    
+    def custom_handler() -> None:
+        call_tracker['called'] = True
+    
+    app.set_empty_command_handler(custom_handler)
+    app._empty_input_command_handler()
+    
+    assert call_tracker['called']
+
+
+def test_set_incorrect_input_syntax_handler_stores_handler() -> None:
+    app = App()
+    call_tracker = {'called': False}
+    
+    def custom_handler(_command: str) -> None:
+        call_tracker['called'] = True
+    
+    app.set_incorrect_input_syntax_handler(custom_handler)
+    app._incorrect_input_syntax_handler('test --flag')
+    
+    assert call_tracker['called']
+
+
+def test_set_repeated_input_flags_handler_stores_handler() -> None:
+    app = App()
+    call_tracker = {'called': False}
+    
+    def custom_handler(_command: str) -> None:
+        call_tracker['called'] = True
+    
+    app.set_repeated_input_flags_handler(custom_handler)
+    app._repeated_input_flags_handler('test --flag --flag')
+    
+    assert call_tracker['called']
+
+
+# ============================================================================
+# Tests for handler execution with output
+# ============================================================================
+
+
+def test_unknown_command_handler_prints_custom_message(capsys: CaptureFixture[str]) -> None:
+    app = App(override_system_messages=True)
+    
+    def custom_handler(command: InputCommand) -> None:
+        print(f'Command not found: {command.trigger}')
+    
+    app.set_unknown_command_handler(custom_handler)
+    app._unknown_command_handler(InputCommand('unknown'))
+    
+    output = capsys.readouterr()
+    assert 'Command not found: unknown' in output.out
+
+
+def test_exit_command_handler_prints_custom_message(capsys: CaptureFixture[str]) -> None:
+    app = App(override_system_messages=True)
+    
+    def custom_handler(_response: Response) -> None:
+        print('Goodbye!')
+    
+    app.set_exit_command_handler(custom_handler)
+    app._exit_command_handler(Response(ResponseStatus.ALL_FLAGS_VALID))
+    
+    output = capsys.readouterr()
+    assert 'Goodbye!' in output.out
+
+
+def test_empty_command_handler_prints_custom_message(capsys: CaptureFixture[str]) -> None:
+    app = App(override_system_messages=True)
+    
+    def custom_handler() -> None:
+        print('Please enter a command')
+    
+    app.set_empty_command_handler(custom_handler)
+    app._empty_input_command_handler()
+    
+    output = capsys.readouterr()
+    assert 'Please enter a command' in output.out
+
+
+def test_incorrect_syntax_handler_prints_custom_message(capsys: CaptureFixture[str]) -> None:
+    app = App(override_system_messages=True)
+    
+    def custom_handler(command: str) -> None:
+        print(f'Syntax error in: {command}')
+    
+    app.set_incorrect_input_syntax_handler(custom_handler)
+    app._incorrect_input_syntax_handler('test --flag')
+    
+    output = capsys.readouterr()
+    assert 'Syntax error in: test --flag' in output.out
+
+
+def test_repeated_flags_handler_prints_custom_message(capsys: CaptureFixture[str]) -> None:
+    app = App(override_system_messages=True)
+    
+    def custom_handler(command: str) -> None:
+        print(f'Duplicate flags in: {command}')
+    
+    app.set_repeated_input_flags_handler(custom_handler)
+    app._repeated_input_flags_handler('test --flag --flag')
+    
+    output = capsys.readouterr()
+    assert 'Duplicate flags in: test --flag --flag' in output.out
+
+
+# ============================================================================
+# Tests for default handler behavior
+# ============================================================================
+
+
+def test_default_unknown_command_handler_prints_message(capsys: CaptureFixture[str]) -> None:
+    app = App(override_system_messages=True)
+    app._unknown_command_handler(InputCommand('unknown'))
+    
+    output = capsys.readouterr()
+    assert 'Unknown command: unknown' in output.out
+
+
+def test_default_empty_command_handler_prints_message(capsys: CaptureFixture[str]) -> None:
+    app = App(override_system_messages=True)
+    app._empty_input_command_handler()
+    
+    output = capsys.readouterr()
+    assert 'Empty input command' in output.out
+
+
+def test_default_incorrect_syntax_handler_prints_message(capsys: CaptureFixture[str]) -> None:
+    app = App(override_system_messages=True)
+    app._incorrect_input_syntax_handler('test --flag')
+    
+    output = capsys.readouterr()
+    assert 'Incorrect flag syntax: test --flag' in output.out
+
+
+def test_default_repeated_flags_handler_prints_message(capsys: CaptureFixture[str]) -> None:
+    app = App(override_system_messages=True)
+    app._repeated_input_flags_handler('test --flag --flag')
+    
+    output = capsys.readouterr()
+    assert 'Repeated input flags: test --flag --flag' in output.out
+
+
+# ============================================================================
+# Tests for handler chaining and multiple calls
+# ============================================================================
+
+
+def test_handler_can_be_replaced_multiple_times() -> None:
+    app = App()
+    call_tracker = {'count': 0}
+    
+    def handler1(_command: InputCommand) -> None:
+        call_tracker['count'] += 1
+    
+    def handler2(_command: InputCommand) -> None:
+        call_tracker['count'] += 10
+    
+    app.set_unknown_command_handler(handler1)
+    app._unknown_command_handler(InputCommand('test'))
+    assert call_tracker['count'] == 1
+    
+    app.set_unknown_command_handler(handler2)
+    app._unknown_command_handler(InputCommand('test'))
+    assert call_tracker['count'] == 11
+
+
+def test_handler_receives_correct_parameters() -> None:
+    app = App()
+    received_data = {'trigger': None}
+    
+    def custom_handler(command: InputCommand) -> None:
+        received_data['trigger'] = command.trigger
+    
+    app.set_unknown_command_handler(custom_handler)
+    app._unknown_command_handler(InputCommand('mycommand'))
+    
+    assert received_data['trigger'] == 'mycommand'
+
+
+def test_exit_handler_receives_response_object() -> None:
+    app = App()
+    received_data = {'response': None}
+    
+    def custom_handler(response: Response) -> None:
+        received_data['response'] = response
+    
+    app.set_exit_command_handler(custom_handler)
+    test_response = Response(ResponseStatus.ALL_FLAGS_VALID)
+    app._exit_command_handler(test_response)
+    
+    assert received_data['response'] is test_response
+
+
+# ============================================================================
+# Tests for handler integration with routers
+# ============================================================================
+
+
+def test_app_with_router_and_custom_unknown_handler(capsys: CaptureFixture[str]) -> None:
+    app = App(override_system_messages=True)
+    router = Router()
+    
+    @router.command(Command('test'))
+    def handler(_res: Response) -> None:
+        print('test executed')
+    
+    app.include_router(router)
+    
+    def custom_unknown_handler(command: InputCommand) -> None:
+        print(f'Not found: {command.trigger}')
+    
+    app.set_unknown_command_handler(custom_unknown_handler)
+    
+    # Test that unknown command uses custom handler
+    assert app._is_unknown_command(InputCommand('unknown'))
+    app._unknown_command_handler(InputCommand('unknown'))
+    
+    output = capsys.readouterr()
+    assert 'Not found: unknown' in output.out
+
+
+def test_app_handlers_work_with_multiple_routers() -> None:
+    app = App(override_system_messages=True)
+    router1 = Router()
+    router2 = Router()
+    
+    @router1.command(Command('cmd1'))
+    def handler1(_res: Response) -> None:
+        pass
+    
+    @router2.command(Command('cmd2'))
+    def handler2(_res: Response) -> None:
+        pass
+    
+    app.include_routers(router1, router2)
+    app._pre_cycle_setup()
+    
+    call_tracker = {'called': False}
+    
+    def custom_handler(_command: InputCommand) -> None:
+        call_tracker['called'] = True
+    
+    app.set_unknown_command_handler(custom_handler)
+    
+    # Both commands should be known
+    assert not app._is_unknown_command(InputCommand('cmd1'))
+    assert not app._is_unknown_command(InputCommand('cmd2'))
+    
+    # Unknown command should trigger handler
+    assert app._is_unknown_command(InputCommand('unknown'))
+    app._unknown_command_handler(InputCommand('unknown'))
+    assert call_tracker['called']
@@ -1,249 +1,315 @@
-from argparse import Namespace
 import sys
-from unittest.mock import call
+from argparse import Namespace
+from typing import TYPE_CHECKING

 import pytest
+from pytest_mock import MockerFixture

-from argenta.orchestrator.argparser.arguments.models import (BaseArgument,
-                                                             BooleanArgument,
-                                                             InputArgument,
-                                                             ValueArgument)
+from argenta.orchestrator.argparser.arguments.models import (
+    BaseArgument,
+    BooleanArgument,
+    InputArgument,
+    ValueArgument,
+)
 from argenta.orchestrator.argparser.entity import ArgParser, ArgSpace

-
-class TestArgumentCreation:
-    """Tests for the creation and attribute validation of argument model classes."""
-
-    def test_value_argument_creation(self):
-        """Ensures ValueArgument instances are created with correct attributes."""
-        arg = ValueArgument(
-            name="test_arg",
-            prefix="--",
-            help="A test argument.",
-            possible_values=["one", "two"],
-            default="one",
-            is_required=True,
-            is_deprecated=False,
-        )
-        assert arg.name == "test_arg"
-        assert arg.prefix == "--"
-        assert arg.help == "A test argument."
-        assert arg.possible_values == ["one", "two"]
-        assert arg.default == "one"
-        assert arg.is_required is True
-        assert arg.is_deprecated is False
-        assert arg.action == "store"
-        assert arg.string_entity == "--test_arg"
-
-    def test_boolean_argument_creation(self):
-        """Ensures BooleanArgument instances are created with correct attributes."""
-        arg = BooleanArgument(
-            name="verbose", prefix="-", help="Enable verbose mode.", is_deprecated=True
-        )
-        assert arg.name == "verbose"
-        assert arg.prefix == "-"
-        assert arg.help == "Enable verbose mode."
-        assert arg.is_deprecated is True
-        assert arg.action == "store_true"
-        assert arg.string_entity == "-verbose"
-
-    def test_input_argument_creation(self):
-        """Ensures InputArgument instances are created with correct attributes."""
-        arg = InputArgument(
-            name="file", value="/path/to/file", founder_class=ValueArgument
-        )
-        assert arg.name == "file"
-        assert arg.value == "/path/to/file"
-        assert arg.founder_class is ValueArgument
+if TYPE_CHECKING:
+    from pytest_mock.plugin import MockType


-class TestArgSpace:
-    """Tests for the ArgSpace class, which holds parsed argument values."""
-
-    @pytest.fixture
-    def mock_arguments(self) -> list[InputArgument]:
-        """Provides a list of mock InputArgument objects for testing."""
-        return [
-            InputArgument(name="arg1", value="val1", founder_class=ValueArgument),
-            InputArgument(name="arg2", value=True, founder_class=BooleanArgument),
-            InputArgument(name="arg3", value="val3", founder_class=ValueArgument),
-        ]
-
-    @pytest.fixture
-    def arg_space(self, mock_arguments: list[InputArgument]) -> ArgSpace:
-        """Provides a pre-populated ArgSpace instance."""
-        return ArgSpace(all_arguments=mock_arguments)
-
-    def test_initialization(self, arg_space: ArgSpace, mock_arguments: list[InputArgument]):
-        """Tests if ArgSpace is initialized correctly with a list of arguments."""
-        assert len(arg_space.all_arguments) == 3
-        assert arg_space.all_arguments == mock_arguments
-
-    def test_get_by_name(self, arg_space: ArgSpace, mock_arguments: list[InputArgument]):
-        """Tests retrieving an argument by its name."""
-        found_arg = arg_space.get_by_name("arg1")
-        assert found_arg is not None
-        assert found_arg == mock_arguments[0]
-
-    def test_get_by_name_not_found(self, arg_space: ArgSpace):
-        """Tests that get_by_name returns None for a non-existent argument."""
-        found_arg = arg_space.get_by_name("non_existent_arg")
-        assert found_arg is None
-
-    def test_get_by_type(self, arg_space: ArgSpace, mock_arguments: list[InputArgument]):
-        """Tests retrieving arguments based on their founder class type."""
-        value_args = arg_space.get_by_type(ValueArgument)
-        assert len(value_args) == 2
-        assert mock_arguments[0] in value_args
-        assert mock_arguments[2] in value_args
-
-        bool_args = arg_space.get_by_type(BooleanArgument)
-        assert len(bool_args) == 1
-        assert mock_arguments[1] in bool_args
-
-    def test_get_by_type_not_found(self, arg_space: ArgSpace):
-        """Tests that get_by_type returns an empty list for an unused argument type."""
-        class OtherArgument(BaseArgument):
-            pass
-        other_args = arg_space.get_by_type(OtherArgument)
-        assert other_args == []
-
-    def test_from_namespace(self):
-        """Tests the class method for creating an ArgSpace from an argparse.Namespace."""
-        namespace = Namespace(config="config.json", debug=True, verbose=False)
-        processed_args = [
-            ValueArgument(name="config", prefix="--"),
-            BooleanArgument(name="debug", prefix="-"),
-            BooleanArgument(name="verbose", prefix="-"),
-        ]
-
-        arg_space = ArgSpace.from_namespace(namespace, processed_args)
-        assert len(arg_space.all_arguments) == 3
-
-        config_arg = arg_space.get_by_name('config')
-        debug_arg = arg_space.get_by_name('debug')
-
-        assert config_arg is not None
-        assert config_arg.value == "config.json"
-        assert config_arg.founder_class is ValueArgument
-
-        assert debug_arg is not None
-        assert debug_arg.value is True
-        assert debug_arg.founder_class is BooleanArgument
+# ============================================================================
+# Tests for argument model creation
+# ============================================================================


-class TestArgParser:
-    """Tests for the ArgParser class, which orchestrates argument parsing."""
+def test_value_argument_stores_all_properties() -> None:
+    arg: ValueArgument = ValueArgument(
+        name="test_arg",
+        prefix="--",
+        help="A test argument.",
+        possible_values=["one", "two"],
+        default="one",
+        is_required=True,
+        is_deprecated=False,
+    )
+    assert arg.name == "test_arg"
+    assert arg.prefix == "--"
+    assert arg.help == "A test argument."
+    assert arg.possible_values == ["one", "two"]
+    assert arg.default == "one"
+    assert arg.is_required is True
+    assert arg.is_deprecated is False
+    assert arg.action == "store"
+    assert arg.string_entity == "--test_arg"

-    @pytest.fixture
-    def value_arg(self) -> ValueArgument:
-        """Provides a sample ValueArgument."""
-        return ValueArgument(name="config", help="Path to config file", default="dev.json", is_required=False, possible_values=["dev.json", "prod.json"])

-    @pytest.fixture
-    def bool_arg(self) -> BooleanArgument:
-        """Provides a sample BooleanArgument."""
-        return BooleanArgument(name="debug", help="Enable debug mode")
+def test_boolean_argument_stores_all_properties() -> None:
+    arg: BooleanArgument = BooleanArgument(
+        name="verbose", prefix="-", help="Enable verbose mode.", is_deprecated=True
+    )
+    assert arg.name == "verbose"
+    assert arg.prefix == "-"
+    assert arg.help == "Enable verbose mode."
+    assert arg.is_deprecated is True
+    assert arg.action == "store_true"
+    assert arg.string_entity == "-verbose"

-    @pytest.fixture
-    def processed_args(self, value_arg: ValueArgument, bool_arg: BooleanArgument) -> list:
-        """Provides a list of processed arguments."""
-        return [value_arg, bool_arg]

-    def test_initialization(self, processed_args: list):
-        """Tests that the ArgParser constructor correctly assigns attributes."""
-        parser = ArgParser(
-            processed_args=processed_args,
-            name="TestApp",
-            description="A test application.",
-            epilog="Test epilog.",
-        )
-        assert parser.name == "TestApp"
-        assert parser.description == "A test application."
-        assert parser.epilog == "Test epilog."
-        assert parser.processed_args == processed_args
-        assert isinstance(parser.parsed_argspace, ArgSpace)
-        assert parser.parsed_argspace.all_arguments == []
+def test_input_argument_stores_all_properties() -> None:
+    arg: InputArgument = InputArgument(
+        name="file", value="/path/to/file", founder_class=ValueArgument
+    )
+    assert arg.name == "file"
+    assert arg.value == "/path/to/file"
+    assert arg.founder_class is ValueArgument

-    @pytest.mark.skipif(sys.version_info < (3, 13), reason="requires python3.13 or higher")
-    def test_register_args(self, mocker, value_arg: ValueArgument, bool_arg: BooleanArgument):
-        """Tests that arguments are correctly registered with the underlying ArgumentParser."""
-        mock_add_argument = mocker.patch("argparse.ArgumentParser.add_argument")

-        parser = ArgParser(processed_args=[value_arg, bool_arg])
+def test_input_argument_str_representation() -> None:
+    arg = InputArgument('host', value='192.168.0.0', founder_class=ValueArgument)
+    assert str(arg) == 'InputArgument(host=192.168.0.0)'

-        expected_calls = [
-            # Call for the ValueArgument
-            call(
-                value_arg.string_entity,
-                action=value_arg.action,
-                help=value_arg.help,
-                default=value_arg.default,
-                choices=value_arg.possible_values,
-                required=value_arg.is_required,
-                deprecated=value_arg.is_deprecated
-            ),
-            # Call for the BooleanArgument
-            call(
-                bool_arg.string_entity,
-                action=bool_arg.action,
-                help=bool_arg.help,
-                deprecated=bool_arg.is_deprecated
-            )
-        ]
-        mock_add_argument.assert_has_calls(expected_calls, any_order=True)
-        
-    @pytest.mark.skipif(sys.version_info > (3, 12), reason='for more latest python version has been other test')
-    def test_register_args(self, mocker, value_arg: ValueArgument, bool_arg: BooleanArgument):
-        """Tests that arguments are correctly registered with the underlying ArgumentParser."""
-        mock_add_argument = mocker.patch("argparse.ArgumentParser.add_argument")

-        parser = ArgParser(processed_args=[value_arg, bool_arg])
+def test_input_argument_repr_representation() -> None:
+    arg = InputArgument('host', value='192.168.0.0', founder_class=ValueArgument)
+    assert repr(arg) == "InputArgument<name=host, value=192.168.0.0, founder_class=ValueArgument>"

-        expected_calls = [
-            # Call for the ValueArgument
-            call(
-                value_arg.string_entity,
-                action=value_arg.action,
-                help=value_arg.help,
-                default=value_arg.default,
-                choices=value_arg.possible_values,
-                required=value_arg.is_required
-            ),
-            # Call for the BooleanArgument
-            call(
-                bool_arg.string_entity,
-                action=bool_arg.action,
-                help=bool_arg.help
-            )
-        ]
-        mock_add_argument.assert_has_calls(expected_calls, any_order=True)

-    def test_parse_args_populates_argspace(self, mocker, processed_args: list[ValueArgument | BooleanArgument]):
-        """Tests that _parse_args correctly calls the parser and populates the ArgSpace."""
-        # 1. Mock the return value of the internal argparse instance
-        mock_namespace = Namespace(config='config.json', debug=True)
-        mocker.patch(
-            'argparse.ArgumentParser.parse_args',
-            return_value=mock_namespace
-        )
+# ============================================================================
+# Fixtures for ArgSpace tests
+# ============================================================================

-        # 2. Initialize the parser and call the method under test
-        parser = ArgParser(processed_args=processed_args)
-        parser._parse_args()  # Test the private method that contains the logic

-        # 3. Assert the results
-        arg_space = parser.parsed_argspace
-        assert isinstance(arg_space, ArgSpace)
-        assert len(arg_space.all_arguments) == 2
+@pytest.fixture
+def mock_arguments() -> list[InputArgument]:
+    return [
+        InputArgument(name="arg1", value="val1", founder_class=ValueArgument),
+        InputArgument(name="arg2", value=True, founder_class=BooleanArgument),
+        InputArgument(name="arg3", value="val3", founder_class=ValueArgument),
+    ]

-        config_arg = arg_space.get_by_name('config')
-        debug_arg = arg_space.get_by_name('debug')

-        assert config_arg is not None
-        assert config_arg.value == 'config.json'
-        assert config_arg.founder_class is ValueArgument
+@pytest.fixture
+def arg_space(mock_arguments: list[InputArgument]) -> ArgSpace:
+    return ArgSpace(all_arguments=mock_arguments)

-        assert debug_arg is not None
-        assert debug_arg.value is True
-        assert debug_arg.founder_class is BooleanArgument
+
+# ============================================================================
+# Tests for ArgSpace initialization and basic operations
+# ============================================================================
+
+
+def test_argspace_initializes_with_arguments(arg_space: ArgSpace, mock_arguments: list[InputArgument]) -> None:
+    assert len(arg_space.all_arguments) == 3
+    assert arg_space.all_arguments == mock_arguments
+
+
+def test_argspace_get_by_name_finds_existing_argument(arg_space: ArgSpace, mock_arguments: list[InputArgument]) -> None:
+    found_arg: InputArgument | None = arg_space.get_by_name("arg1")
+    assert found_arg is not None
+    assert found_arg == mock_arguments[0]
+
+
+def test_argspace_get_by_name_returns_none_for_missing_argument(arg_space: ArgSpace) -> None:
+    found_arg: InputArgument | None = arg_space.get_by_name("non_existent_arg")
+    assert found_arg is None
+
+
+def test_argspace_get_by_type_filters_value_arguments(arg_space: ArgSpace, mock_arguments: list[InputArgument]) -> None:
+    value_args = arg_space.get_by_type(ValueArgument)
+    assert len(value_args) == 2
+    assert mock_arguments[0] in value_args
+    assert mock_arguments[2] in value_args
+
+
+def test_argspace_get_by_type_filters_boolean_arguments(arg_space: ArgSpace, mock_arguments: list[InputArgument]) -> None:
+    bool_args = arg_space.get_by_type(BooleanArgument)
+    assert len(bool_args) == 1
+    assert mock_arguments[1] in bool_args
+
+
+def test_argspace_get_by_type_returns_empty_list_for_unknown_type(arg_space: ArgSpace) -> None:
+    class OtherArgument(BaseArgument):
+        pass
+
+    other_args = arg_space.get_by_type(OtherArgument)  # pyright: ignore[reportAssignmentType]
+    assert other_args == []
+
+
+def test_argspace_from_namespace_creates_argspace_from_parsed_namespace() -> None:
+    namespace: Namespace = Namespace(config="config.json", debug=True, verbose=False)
+    processed_args: list[ValueArgument | BooleanArgument] = [
+        ValueArgument(name="config", prefix="--"),
+        BooleanArgument(name="debug", prefix="-"),
+        BooleanArgument(name="verbose", prefix="-"),
+    ]
+
+    arg_space: ArgSpace = ArgSpace.from_namespace(namespace, processed_args)
+    assert len(arg_space.all_arguments) == 3
+
+    config_arg: InputArgument | None = arg_space.get_by_name('config')
+    debug_arg: InputArgument | None = arg_space.get_by_name('debug')
+
+    assert config_arg is not None
+    assert config_arg.value == "config.json"
+    assert config_arg.founder_class is ValueArgument
+
+    assert debug_arg is not None
+    assert debug_arg.value is True
+    assert debug_arg.founder_class is BooleanArgument
+
+
+# ============================================================================
+# Fixtures for ArgParser tests
+# ============================================================================
+
+
+@pytest.fixture
+def value_arg() -> ValueArgument:
+    return ValueArgument(
+        name="config",
+        help="Path to config file",
+        default="dev.json",
+        is_required=False,
+        possible_values=["dev.json", "prod.json"],
+    )
+
+
+@pytest.fixture
+def bool_arg() -> BooleanArgument:
+    return BooleanArgument(name="debug", help="Enable debug mode")
+
+
+@pytest.fixture
+def processed_args(value_arg: ValueArgument, bool_arg: BooleanArgument) -> list[ValueArgument | BooleanArgument]:
+    return [value_arg, bool_arg]
+
+
+# ============================================================================
+# Tests for ArgParser initialization
+# ============================================================================
+
+
+def test_argparser_initializes_with_all_properties(processed_args: list[ValueArgument | BooleanArgument]) -> None:
+    parser: ArgParser = ArgParser(
+        processed_args=processed_args,
+        name="TestApp",
+        description="A test application.",
+        epilog="Test epilog.",
+    )
+    assert parser.name == "TestApp"
+    assert parser.description == "A test application."
+    assert parser.epilog == "Test epilog."
+    assert parser.processed_args == processed_args
+    assert isinstance(parser.parsed_argspace, ArgSpace)
+    assert parser.parsed_argspace.all_arguments == []
+
+
+# ============================================================================
+# Tests for ArgParser argument registration (Python version specific)
+# ============================================================================
+
+
+@pytest.mark.skipif(sys.version_info < (3, 13), reason="requires python3.13 or higher")
+def test_argparser_registers_arguments_with_deprecated_flag_py313(
+    mocker: MockerFixture, value_arg: ValueArgument, bool_arg: BooleanArgument
+) -> None:
+    mock_add_argument: MockType = mocker.patch("argparse.ArgumentParser.add_argument")
+
+    _parser: ArgParser = ArgParser(processed_args=[value_arg, bool_arg])
+
+    # ArgParser may add additional arguments (like help), so check at least 2
+    assert mock_add_argument.call_count >= 2
+    
+    # Check that value_arg was registered correctly
+    value_arg_call = None
+    bool_arg_call = None
+    
+    for call_args in mock_add_argument.call_args_list:
+        args, kwargs = call_args
+        if len(args) > 0 and args[0] == value_arg.string_entity:
+            value_arg_call = (args, kwargs)
+        elif len(args) > 0 and args[0] == bool_arg.string_entity:
+            bool_arg_call = (args, kwargs)
+    
+    assert value_arg_call is not None, "value_arg was not registered"
+    _, value_kwargs = value_arg_call
+    assert value_kwargs['action'] == value_arg.action
+    assert value_kwargs['help'] == value_arg.help
+    assert value_kwargs['default'] == value_arg.default
+    assert value_kwargs['choices'] == value_arg.possible_values
+    assert value_kwargs['required'] == value_arg.is_required
+    assert value_kwargs['deprecated'] == value_arg.is_deprecated
+    
+    assert bool_arg_call is not None, "bool_arg was not registered"
+    _, bool_kwargs = bool_arg_call
+    assert bool_kwargs['action'] == bool_arg.action
+    assert bool_kwargs['help'] == bool_arg.help
+    assert bool_kwargs['deprecated'] == bool_arg.is_deprecated
+
+
+@pytest.mark.skipif(sys.version_info > (3, 12), reason="for more latest python version has been other test")
+def test_argparser_registers_arguments_without_deprecated_flag_py312(
+    mocker: MockerFixture, value_arg: ValueArgument, bool_arg: BooleanArgument
+) -> None:
+    mock_add_argument: MockType = mocker.patch("argparse.ArgumentParser.add_argument")
+
+    _parser: ArgParser = ArgParser(processed_args=[value_arg, bool_arg])
+
+    # ArgParser may add additional arguments (like help), so check at least 2
+    assert mock_add_argument.call_count >= 2
+    
+    # Check that value_arg was registered correctly
+    value_arg_call = None
+    bool_arg_call = None
+    
+    for call_args in mock_add_argument.call_args_list:
+        args, kwargs = call_args
+        if len(args) > 0 and args[0] == value_arg.string_entity:
+            value_arg_call = (args, kwargs)
+        elif len(args) > 0 and args[0] == bool_arg.string_entity:
+            bool_arg_call = (args, kwargs)
+    
+    assert value_arg_call is not None, "value_arg was not registered"
+    _, value_kwargs = value_arg_call
+    assert value_kwargs['action'] == value_arg.action
+    assert value_kwargs['help'] == value_arg.help
+    assert value_kwargs['default'] == value_arg.default
+    assert value_kwargs['choices'] == value_arg.possible_values
+    assert value_kwargs['required'] == value_arg.is_required
+    assert 'deprecated' not in value_kwargs
+    
+    assert bool_arg_call is not None, "bool_arg was not registered"
+    _, bool_kwargs = bool_arg_call
+    assert bool_kwargs['action'] == bool_arg.action
+    assert bool_kwargs['help'] == bool_arg.help
+    assert 'deprecated' not in bool_kwargs
+
+
+# ============================================================================
+# Tests for ArgParser argument parsing
+# ============================================================================
+
+
+def test_argparser_parse_args_populates_argspace_correctly(
+    mocker: MockerFixture, processed_args: list[ValueArgument | BooleanArgument]
+) -> None:
+    mock_namespace: Namespace = Namespace(config='config.json', debug=True)
+    mocker.patch('argparse.ArgumentParser.parse_args', return_value=mock_namespace)
+
+    parser: ArgParser = ArgParser(processed_args=processed_args)
+    parser._parse_args()
+
+    arg_space: ArgSpace = parser.parsed_argspace
+    assert isinstance(arg_space, ArgSpace)
+    assert len(arg_space.all_arguments) == 2
+
+    config_arg: InputArgument | None = arg_space.get_by_name('config')
+    debug_arg: InputArgument | None = arg_space.get_by_name('debug')
+
+    assert config_arg is not None
+    assert config_arg.value == 'config.json'
+    assert config_arg.founder_class is ValueArgument
+
+    assert debug_arg is not None
+    assert debug_arg.value is True
+    assert debug_arg.founder_class is BooleanArgument
@@ -1,198 +1,209 @@
 import os
-from unittest.mock import MagicMock, call, patch
+from typing import Any

 import pytest
+from pyfakefs.fake_filesystem import FakeFilesystem
+from pytest_mock import MockerFixture
+
+from argenta.app.autocompleter.entity import (
+    AutoCompleter,
+    _get_history_items,
+    _is_command_exist,
+)
+
+
+HISTORY_FILE: str = "test_history.txt"
+COMMANDS: list[str] = ["start", "stop", "status"]
+
+
+# ============================================================================
+# Fixtures
+# ============================================================================

-# Since readline is not available on all platforms (e.g., Windows) for testing,
-# it is mocked for all tests.
-readline_mock = MagicMock()

-# We patch the module where it's imported, not where it's defined.
@pytest.fixture
-def mock_readline():
-    """Fixture to provide a mock of the `readline` module."""
-    with patch('argenta.app.autocompleter.entity.readline', readline_mock) as mock:
-        # This nested state simulates readline's internal history list.
-        _history = []
+def mock_readline(mocker: MockerFixture) -> Any:
+    _history: list[str] = []

-        def add_history(item: str) -> None:
-            _history.append(item)
+    def add_history(item: str) -> None:
+        _history.append(item)

-        def get_history_item(index: int) -> str | None:
-            # readline history is 1-based.
-            if 1 <= index <= len(_history):
-                return _history[index - 1]
-            return None
+    def get_history_item(index: int) -> str | None:
+        if 1 <= index <= len(_history):
+            return _history[index - 1]
+        return None

-        def get_current_history_length() -> int:
-            return len(_history)
+    def get_current_history_length() -> int:
+        return len(_history)

-        def clear_history() -> None:
-            _history.clear()
+    def clear_history() -> None:
+        _history.clear()

-        # Reset all mocks and the internal history before each test.
-        mock.reset_mock()
-        clear_history()
+    mock: Any = mocker.MagicMock()  # pyright: ignore[reportUnknownMemberType, reportUnknownVariableType]
+    mocker.patch('argenta.app.autocompleter.entity.readline', mock)  # pyright: ignore[reportUnknownArgumentType]

-        # Apply side effects to mock functions to simulate real behavior.
-        mock.add_history.side_effect = add_history
-        mock.get_history_item.side_effect = get_history_item
-        mock.get_current_history_length.side_effect = get_current_history_length
+    mock.reset_mock()  # pyright: ignore[reportUnknownMemberType]
+    clear_history()

-        # Provide a default return value for functions that are read from.
-        mock.get_completer_delims.return_value = " "
+    mock.add_history.side_effect = add_history  # pyright: ignore[reportUnknownMemberType]
+    mock.get_history_item.side_effect = get_history_item  # pyright: ignore[reportUnknownMemberType]
+    mock.get_current_history_length.side_effect = get_current_history_length  # pyright: ignore[reportUnknownMemberType]
+    mock.get_completer_delims.return_value = " "  # pyright: ignore[reportUnknownMemberType]

-        yield mock
-
-# We import the class under test after setting up the patch context if needed,
-# or ensure patches target the correct import location.
-from argenta.app.autocompleter.entity import (AutoCompleter,
-                                              _get_history_items,
-                                              _is_command_exist)
+    return mock  # pyright: ignore[reportReturnType, reportUnknownVariableType]


-class TestAutoCompleter:
-    """Test suite for the AutoCompleter class."""
-    HISTORY_FILE = "test_history.txt"
-    COMMANDS = ["start", "stop", "status"]
-
-    def test_initialization(self):
-        """Tests that the constructor correctly assigns attributes."""
-        completer = AutoCompleter(history_filename=self.HISTORY_FILE, autocomplete_button="tab")
-        assert completer.history_filename == self.HISTORY_FILE
-        assert completer.autocomplete_button == "tab"
-
-    def test_initial_setup_if_history_file_does_not_exist(self, fs, mock_readline):
-        """Tests initial setup creates history from commands when the history file is absent."""
-        # Ensure the file does not exist in the fake filesystem.
-        if os.path.exists(self.HISTORY_FILE):
-            os.remove(self.HISTORY_FILE)
-
-        completer = AutoCompleter(history_filename=self.HISTORY_FILE)
-        completer.initial_setup(self.COMMANDS)
-
-        mock_readline.read_history_file.assert_not_called()
-        expected_calls = [call(cmd) for cmd in self.COMMANDS]
-        mock_readline.add_history.assert_has_calls(expected_calls, any_order=True)
-        assert mock_readline.add_history.call_count == len(self.COMMANDS)
-
-        mock_readline.set_completer.assert_called_with(completer._complete)
-        mock_readline.parse_and_bind.assert_called_with("tab: complete")
-
-    def test_initial_setup_if_history_file_exists(self, fs, mock_readline):
-        """Tests initial setup reads from an existing history file."""
-        fs.create_file(self.HISTORY_FILE, contents="previous_command\n")
-
-        completer = AutoCompleter(history_filename=self.HISTORY_FILE)
-        completer.initial_setup(self.COMMANDS)
-
-        mock_readline.read_history_file.assert_called_once_with(self.HISTORY_FILE)
-        mock_readline.add_history.assert_not_called()
-        mock_readline.set_completer.assert_called_once()
-        mock_readline.parse_and_bind.assert_called_once()
-
-    def test_initial_setup_with_no_history_filename(self, mock_readline):
-        """Tests initial setup when no history filename is provided."""
-        completer = AutoCompleter(history_filename=None)
-        completer.initial_setup(self.COMMANDS)
-
-        mock_readline.read_history_file.assert_not_called()
-        expected_calls = [call(cmd) for cmd in self.COMMANDS]
-        mock_readline.add_history.assert_has_calls(expected_calls, any_order=True)
-
-    def test_exit_setup_writes_and_filters_history(self, fs, mock_readline):
-        """Tests that exit_setup writes a filtered and unique history to the file."""
-        # 1. Populate the mock readline history.
-        mock_readline.add_history.side_effect(None) # Temporarily disable side effect to just record calls
-        mock_readline.add_history("start server")
-        mock_readline.add_history("stop client")
-        mock_readline.add_history("invalid command")
-        mock_readline.add_history("start server")  # Add a duplicate.
-
-        # 2. Simulate the state of the history file after readline.write_history_file would have run.
-        raw_history_content = "\n".join(["start server", "stop client", "invalid command", "start server"])
-        fs.create_file(self.HISTORY_FILE, contents=raw_history_content)
-
-        # 3. Call the method under test.
-        completer = AutoCompleter(history_filename=self.HISTORY_FILE)
-        completer.exit_setup(all_commands=["start", "stop"], ignore_command_register=False)
-
-        # 4. Assert that readline's write function was called.
-        mock_readline.write_history_file.assert_called_once_with(self.HISTORY_FILE)
-
-        # 5. Assert the file was correctly re-written with filtered and unique content.
-        with open(self.HISTORY_FILE, "r") as f:
-            content = f.read()
-            lines = sorted(content.strip().split("\n"))
-            assert lines == ["start server", "stop client"]
-
-    def test_exit_setup_with_no_history_filename(self, mock_readline):
-        """Tests that exit_setup does nothing if no filename is provided."""
-        completer = AutoCompleter(history_filename=None)
-        completer.exit_setup(all_commands=self.COMMANDS, ignore_command_register=False)
-        mock_readline.write_history_file.assert_not_called()
-
-    def test_complete_with_no_matches(self, mock_readline):
-        """Tests the _complete method when there are no matching history items."""
-        for cmd in ["start", "stop"]:
-            mock_readline.add_history(cmd)
-
-        completer = AutoCompleter()
-        assert completer._complete("run", 0) is None
-        assert completer._complete("run", 1) is None
-
-    def test_complete_with_one_match(self, mock_readline):
-        """Tests the _complete method when there is exactly one match."""
-        mock_readline.add_history("start server")
-        mock_readline.add_history("stop server")
-
-        completer = AutoCompleter()
-        assert completer._complete("start", 0) == "start server"
-        assert completer._complete("start", 1) is None  # Subsequent states yield no matches
-
-    def test_complete_with_multiple_matches(self, mock_readline):
-        """Tests _complete with multiple matches that share a common prefix."""
-        mock_readline.add_history("status client")
-        mock_readline.add_history("status server")
-        mock_readline.add_history("stop")
-
-        completer = AutoCompleter()
-
-        # On state 0, it should insert the common prefix via readline and return None.
-        result = completer._complete("stat", 0)
-        assert result is None
-        mock_readline.insert_text.assert_called_once_with("us ")  # Completes "stat" to "status "
-        mock_readline.redisplay.assert_called_once()
-
-        # On subsequent states, it should do nothing.
-        mock_readline.reset_mock()
-        result_state_1 = completer._complete("stat", 1)
-        assert result_state_1 is None
-        mock_readline.insert_text.assert_not_called()
+# ============================================================================
+# Tests for AutoCompleter initialization
+# ============================================================================


-class TestHelperFunctions:
-    """Test suite for helper functions in the autocompleter module."""
+def test_autocompleter_initializes_with_history_file_and_button() -> None:
+    completer: AutoCompleter = AutoCompleter(history_filename=HISTORY_FILE, autocomplete_button="tab")
+    assert completer.history_filename == HISTORY_FILE
+    assert completer.autocomplete_button == "tab"

-    def test_is_command_exist(self):
-        """Tests the _is_command_exist helper function."""
-        existing = ["start", "stop", "status"]

-        # Case-sensitive check
-        assert _is_command_exist("start", existing, ignore_command_register=False) is True
-        assert _is_command_exist("START", existing, ignore_command_register=False) is False
-        assert _is_command_exist("unknown", existing, ignore_command_register=False) is False
+# ============================================================================
+# Tests for initial setup
+# ============================================================================

-        # Case-insensitive check
-        assert _is_command_exist("start", existing, ignore_command_register=True) is True
-        assert _is_command_exist("START", existing, ignore_command_register=True) is True
-        assert _is_command_exist("unknown", existing, ignore_command_register=True) is False

-    def test_get_history_items(self, mock_readline):
-        """Tests the _get_history_items helper function."""
-        assert _get_history_items() == []
+def test_initial_setup_creates_history_when_file_does_not_exist(fs: FakeFilesystem, mock_readline: Any) -> None:
+    if os.path.exists(HISTORY_FILE):
+        os.remove(HISTORY_FILE)

-        mock_readline.add_history("first item")
-        mock_readline.add_history("second item")
+    completer: AutoCompleter = AutoCompleter(history_filename=HISTORY_FILE)
+    completer.initial_setup(COMMANDS)

-        assert _get_history_items() == ["first item", "second item"]
+    mock_readline.read_history_file.assert_not_called()
+    assert mock_readline.add_history.call_count == len(COMMANDS)
+
+    mock_readline.set_completer.assert_called_with(completer._complete)
+    mock_readline.parse_and_bind.assert_called_with("tab: complete")
+
+
+def test_initial_setup_reads_existing_history_file(fs: FakeFilesystem, mock_readline: Any) -> None:
+    fs.create_file(HISTORY_FILE, contents="previous_command\n")  # pyright: ignore[reportUnknownMemberType]
+
+    completer: AutoCompleter = AutoCompleter(history_filename=HISTORY_FILE)
+    completer.initial_setup(COMMANDS)
+
+    mock_readline.read_history_file.assert_called_once_with(HISTORY_FILE)
+    mock_readline.add_history.assert_not_called()
+    mock_readline.set_completer.assert_called_once()
+    mock_readline.parse_and_bind.assert_called_once()
+
+
+def test_initial_setup_works_without_history_filename(mock_readline: Any) -> None:
+    completer: AutoCompleter = AutoCompleter(history_filename=None)
+    completer.initial_setup(COMMANDS)
+
+    mock_readline.read_history_file.assert_not_called()
+    assert mock_readline.add_history.call_count == len(COMMANDS)
+
+
+# ============================================================================
+# Tests for exit setup and history filtering
+# ============================================================================
+
+
+def test_exit_setup_writes_and_filters_duplicate_commands(fs: FakeFilesystem, mock_readline: Any) -> None:
+    mock_readline.add_history.side_effect = None
+    mock_readline.add_history("start server")
+    mock_readline.add_history("stop client")
+    mock_readline.add_history("invalid command")
+    mock_readline.add_history("start server")
+
+    raw_history_content: str = "\n".join(["start server", "stop client", "invalid command", "start server"])
+    fs.create_file(HISTORY_FILE, contents=raw_history_content)  # pyright: ignore[reportUnknownMemberType]
+
+    completer: AutoCompleter = AutoCompleter(history_filename=HISTORY_FILE)
+    completer.exit_setup(all_commands=["start", "stop"], ignore_command_register=False)
+
+    mock_readline.write_history_file.assert_called_once_with(HISTORY_FILE)
+
+    with open(HISTORY_FILE) as f:
+        content: str = f.read()
+        lines: list[str] = sorted(content.strip().split("\n"))
+        assert lines == ["start server", "stop client"]
+
+
+def test_exit_setup_skips_writing_when_no_history_filename(mock_readline: Any) -> None:
+    completer: AutoCompleter = AutoCompleter(history_filename=None)
+    completer.exit_setup(all_commands=COMMANDS, ignore_command_register=False)
+    mock_readline.write_history_file.assert_not_called()
+
+
+# ============================================================================
+# Tests for autocomplete functionality
+# ============================================================================
+
+
+def test_complete_returns_none_when_no_matches_found(mock_readline: Any) -> None:
+    cmd: str
+    for cmd in ["start", "stop"]:
+        mock_readline.add_history(cmd)
+
+    completer: AutoCompleter = AutoCompleter()
+    assert completer._complete("run", 0) is None
+    assert completer._complete("run", 1) is None
+
+
+def test_complete_returns_single_match(mock_readline: Any) -> None:
+    mock_readline.add_history("start server")
+    mock_readline.add_history("stop server")
+
+    completer: AutoCompleter = AutoCompleter()
+    assert completer._complete("start", 0) == "start server"
+    assert completer._complete("start", 1) is None
+
+
+def test_complete_inserts_common_prefix_for_multiple_matches(mock_readline: Any) -> None:
+    mock_readline.add_history("status client")
+    mock_readline.add_history("status server")
+    mock_readline.add_history("stop")
+
+    completer: AutoCompleter = AutoCompleter()
+
+    result: str | None = completer._complete("stat", 0)
+    assert result is None
+    mock_readline.insert_text.assert_called_once_with("us ")
+    mock_readline.redisplay.assert_called_once()
+
+    mock_readline.reset_mock()
+    result_state_1: str | None = completer._complete("stat", 1)
+    assert result_state_1 is None
+    mock_readline.insert_text.assert_not_called()
+
+
+# ============================================================================
+# Tests for helper functions
+# ============================================================================
+
+
+def test_is_command_exist_checks_case_sensitive_when_enabled() -> None:
+    existing: list[str] = ["start", "stop", "status"]
+
+    assert _is_command_exist("start", existing, ignore_command_register=False) is True
+    assert _is_command_exist("START", existing, ignore_command_register=False) is False
+    assert _is_command_exist("unknown", existing, ignore_command_register=False) is False
+
+
+def test_is_command_exist_checks_case_insensitive_when_enabled() -> None:
+    existing: list[str] = ["start", "stop", "status"]
+
+    assert _is_command_exist("start", existing, ignore_command_register=True) is True
+    assert _is_command_exist("START", existing, ignore_command_register=True) is True
+    assert _is_command_exist("unknown", existing, ignore_command_register=True) is False
+
+
+def test_get_history_items_returns_empty_list_initially(mock_readline: Any) -> None:
+    assert _get_history_items() == []
+
+
+def test_get_history_items_returns_all_added_items(mock_readline: Any) -> None:
+    mock_readline.add_history("first item")
+    mock_readline.add_history("second item")
+
+    assert _get_history_items() == ["first item", "second item"]
@@ -1,63 +1,114 @@
 import re
-import unittest

-from argenta.command.exceptions import (EmptyInputCommandException,
-                                        RepeatedInputFlagsException,
-                                        UnprocessedInputFlagException)
+import pytest
+
+from argenta.command.exceptions import (
+    EmptyInputCommandException,
+    RepeatedInputFlagsException,
+    UnprocessedInputFlagException,
+)
 from argenta.command.flag import Flag, InputFlag
 from argenta.command.flag.flags import Flags
 from argenta.command.flag.models import PossibleValues, ValidationStatus
 from argenta.command.models import Command, InputCommand


-class TestInputCommand(unittest.TestCase):
-    def test_parse_correct_raw_command(self):
-        self.assertEqual(InputCommand.parse('ssh --host 192.168.0.3').trigger, 'ssh')
+# ============================================================================
+# Tests for InputCommand parsing - successful cases
+# ============================================================================

-    def test_parse_raw_command_without_flag_name_with_value(self):
-        with self.assertRaises(UnprocessedInputFlagException):
-            InputCommand.parse('ssh 192.168.0.3')

-    def test_parse_raw_command_with_repeated_flag_name(self):
-        with self.assertRaises(RepeatedInputFlagsException):
-            InputCommand.parse('ssh --host 192.168.0.3 --host 172.198.0.43')
+def test_parse_extracts_trigger_from_command_with_flags() -> None:
+    assert InputCommand.parse('ssh --host 192.168.0.3').trigger == 'ssh'

-    def test_parse_empty_raw_command(self):
-        with self.assertRaises(EmptyInputCommandException):
-            InputCommand.parse('')

-    def test_validate_invalid_input_flag1(self):
-        command = Command('some', flags=Flag('test'))
-        self.assertEqual(command.validate_input_flag(InputFlag('test', input_value='', status=None)), ValidationStatus.INVALID)
+def test_parse_returns_input_command_instance() -> None:
+    cmd = InputCommand.parse('ssh --host 192.168.0.3')
+    assert isinstance(cmd, InputCommand)

-    def test_validate_valid_input_flag2(self):
-        command = Command('some', flags=Flags([Flag('test'), Flag('more')]))
-        self.assertEqual(command.validate_input_flag(InputFlag('more', input_value='random-value', status=None)), ValidationStatus.VALID)

-    def test_validate_undefined_input_flag1(self):
-        command = Command('some', flags=Flag('test'))
-        self.assertEqual(command.validate_input_flag(InputFlag('more', input_value='', status=None)), ValidationStatus.UNDEFINED)
+def test_parse_handles_triple_prefix_flags() -> None:
+    assert InputCommand.parse(
+        'ssh ---host 192.168.0.0'
+    ).input_flags.get_flag_by_name('host') == \
+    InputFlag('host', input_value='192.168.0.0', prefix='---')

-    def test_validate_undefined_input_flag2(self):
-        command = Command('some', flags=Flags([Flag('test'), Flag('more')]))
-        self.assertEqual(command.validate_input_flag(InputFlag('case', input_value='', status=None)), ValidationStatus.UNDEFINED)

-    def test_validate_undefined_input_flag3(self):
-        command = Command('some')
-        self.assertEqual(command.validate_input_flag(InputFlag('case', input_value='', status=None)), ValidationStatus.UNDEFINED)
+# ============================================================================
+# Tests for InputCommand parsing - error cases
+# ============================================================================

-    def test_invalid_input_flag1(self):
-        command = Command('some', flags=Flag('test', possible_values=PossibleValues.NEITHER))
-        self.assertEqual(command.validate_input_flag(InputFlag('test', input_value='example', status=None)), ValidationStatus.INVALID)

-    def test_invalid_input_flag2(self):
-        command = Command('some', flags=Flag('test', possible_values=['some', 'case']))
-        self.assertEqual(command.validate_input_flag(InputFlag('test', input_value='slay', status=None)), ValidationStatus.INVALID)
+def test_parse_raises_error_for_value_without_flag_name() -> None:
+    with pytest.raises(UnprocessedInputFlagException):
+        InputCommand.parse('ssh 192.168.0.3')

-    def test_invalid_input_flag3(self):
-        command = Command('some', flags=Flag('test', possible_values=re.compile(r'^ex\d{, 2}op$')))
-        self.assertEqual(command.validate_input_flag(InputFlag('test', input_value='example', status=None)), ValidationStatus.INVALID)

-    def test_isinstance_parse_correct_raw_command(self):
-        cmd = InputCommand.parse('ssh --host 192.168.0.3')
-        self.assertIsInstance(cmd, InputCommand)
+def test_parse_raises_error_for_repeated_flag_names() -> None:
+    with pytest.raises(RepeatedInputFlagsException):
+        InputCommand.parse('ssh --host 192.168.0.3 --host 172.198.0.43')
+
+
+def test_parse_raises_error_for_unprocessed_entity_after_flags() -> None:
+    with pytest.raises(UnprocessedInputFlagException):
+        InputCommand.parse('ssh --host 192.168.0.3 9977')
+
+
+def test_parse_raises_error_for_empty_command() -> None:
+    with pytest.raises(EmptyInputCommandException):
+        InputCommand.parse('')
+
+
+# ============================================================================
+# Tests for flag validation - valid flags
+# ============================================================================
+
+
+def test_validate_input_flag_returns_valid_for_registered_flag() -> None:
+    command = Command('some', flags=Flags([Flag('test'), Flag('more')]))
+    assert command.validate_input_flag(InputFlag('more', input_value='random-value', status=None)) == ValidationStatus.VALID
+
+
+# ============================================================================
+# Tests for flag validation - invalid flags
+# ============================================================================
+
+
+def test_validate_input_flag_returns_invalid_for_flag_with_empty_value() -> None:
+    command = Command('some', flags=Flag('test'))
+    assert command.validate_input_flag(InputFlag('test', input_value='', status=None)) == ValidationStatus.INVALID
+
+
+def test_validate_input_flag_returns_invalid_when_value_provided_for_neither_flag() -> None:
+    command = Command('some', flags=Flag('test', possible_values=PossibleValues.NEITHER))
+    assert command.validate_input_flag(InputFlag('test', input_value='example', status=None)) == ValidationStatus.INVALID
+
+
+def test_validate_input_flag_returns_invalid_when_value_not_in_allowed_list() -> None:
+    command = Command('some', flags=Flag('test', possible_values=['some', 'case']))
+    assert command.validate_input_flag(InputFlag('test', input_value='slay', status=None)) == ValidationStatus.INVALID
+
+
+def test_validate_input_flag_returns_invalid_when_value_does_not_match_regex() -> None:
+    command = Command('some', flags=Flag('test', possible_values=re.compile(r'^ex\d{1,2}op$')))
+    assert command.validate_input_flag(InputFlag('test', input_value='example', status=None)) == ValidationStatus.INVALID
+
+
+# ============================================================================
+# Tests for flag validation - undefined flags
+# ============================================================================
+
+
+def test_validate_input_flag_returns_undefined_for_unregistered_flag_name() -> None:
+    command = Command('some', flags=Flag('test'))
+    assert command.validate_input_flag(InputFlag('more', input_value='', status=None)) == ValidationStatus.UNDEFINED
+
+
+def test_validate_input_flag_returns_undefined_for_unregistered_flag_in_multiple_flags() -> None:
+    command = Command('some', flags=Flags([Flag('test'), Flag('more')]))
+    assert command.validate_input_flag(InputFlag('case', input_value='', status=None)) == ValidationStatus.UNDEFINED
+
+
+def test_validate_input_flag_returns_undefined_when_command_has_no_flags() -> None:
+    command = Command('some')
+    assert command.validate_input_flag(InputFlag('case', input_value='', status=None)) == ValidationStatus.UNDEFINED
@@ -0,0 +1,120 @@
+from typing import Generator
+
+import pytest
+from dishka import Container, make_container
+
+from argenta import App, DataBridge, Router
+from argenta.di.integration import (
+    FromDishka,
+    _auto_inject_handlers,
+    _get_container_from_response,
+    setup_dishka,
+)
+from argenta.di.providers import SystemProvider
+from argenta.orchestrator.argparser import ArgParser, ArgSpace
+from argenta.response import ResponseStatus
+from argenta.response.entity import Response
+
+
+# ============================================================================
+# Fixtures
+# ============================================================================
+
+
+@pytest.fixture
+def argparser() -> ArgParser:
+    return ArgParser(processed_args=[])
+
+
+@pytest.fixture
+def container(argparser: ArgParser) -> Generator[Container, None, None]:
+    container = make_container(SystemProvider(), context={ArgParser: argparser})
+    yield container
+    container.close()
+
+
+# ============================================================================
+# Tests for container retrieval from response
+# ============================================================================
+
+
+def test_get_container_from_response_extracts_container_from_first_response_arg(container: Container) -> None:
+    Response.patch_by_container(container)
+    response = Response(ResponseStatus.ALL_FLAGS_VALID)
+    assert _get_container_from_response((response,), {}) == container
+
+
+def test_get_container_from_response_extracts_container_from_second_response_arg(container: Container) -> None:
+    Response.patch_by_container(container)
+    response = Response(ResponseStatus.ALL_FLAGS_VALID)
+    assert _get_container_from_response((object(), response,), {}) == container
+
+
+def test_get_container_from_response_raises_error_when_container_not_patched() -> None:
+    delattr(Response, '__dishka_container__')
+    response = Response(ResponseStatus.ALL_FLAGS_VALID)
+    with pytest.raises(RuntimeError):
+        _get_container_from_response((response,), {})
+
+
+def test_get_container_from_response_raises_error_when_no_response_in_args(container: Container) -> None:
+    Response.patch_by_container(container)
+    with pytest.raises(RuntimeError):
+        _get_container_from_response((), {})
+
+
+# ============================================================================
+# Tests for dishka setup
+# ============================================================================
+
+
+def test_setup_dishka_with_auto_inject_enabled(container: Container) -> None:
+    app = App()
+    router = Router()
+    
+    @router.command('command')
+    def handler(_res: Response, data_bridge: FromDishka[DataBridge]) -> None:
+        print(data_bridge)
+        
+    app.include_router(router)
+    
+    assert setup_dishka(app, container, auto_inject=True) is None
+
+
+def test_setup_dishka_with_auto_inject_disabled(container: Container) -> None:
+    app = App()
+    assert setup_dishka(app, container, auto_inject=False) is None
+
+
+# ============================================================================
+# Tests for auto injection
+# ============================================================================
+
+
+def test_auto_inject_handlers_injects_dependencies_into_handlers(container: Container) -> None:
+    Response.patch_by_container(container)
+    
+    app = App()
+    router = Router()
+    
+    @router.command('command')
+    def handler(_res: Response, data_bridge: FromDishka[DataBridge]) -> None:
+        print(data_bridge)
+        
+    app.include_router(router)
+        
+    _auto_inject_handlers(app)
+    _auto_inject_handlers(app)  # check idempotency
+
+
+# ============================================================================
+# Tests for container dependency resolution
+# ============================================================================F
+
+
+def test_container_resolves_argspace_dependency(container: Container) -> None:
+    assert isinstance(container.get(ArgSpace), ArgSpace)
+
+
+def test_container_resolves_databridge_dependency(container: Container) -> None:
+    assert isinstance(container.get(DataBridge), DataBridge)
@@ -1,21 +1,61 @@
-import unittest
-
 from argenta.app.dividing_line import DynamicDividingLine, StaticDividingLine


-class TestDividingLine(unittest.TestCase):
-    def test_get_static_dividing_line_full_line(self):
-        line = StaticDividingLine('-')
-        self.assertEqual(line.get_full_static_line(is_override=True).count('-'), 25)
+# ============================================================================
+# Tests for StaticDividingLine - full line generation
+# ============================================================================

-    def test_get_dynamic_dividing_line_full_line(self):
-        line = DynamicDividingLine()
-        self.assertEqual(line.get_full_dynamic_line(length=20, is_override=True).count('-'), 20)

-    def test_get_dividing_line_unit_part(self):
-        line = StaticDividingLine('')
-        self.assertEqual(line.get_unit_part(), ' ')
+def test_static_dividing_line_generates_default_length_with_override() -> None:
+    line = StaticDividingLine('-')
+    assert line.get_full_static_line(is_override=True).count('-') == 25

-    def test_get_dividing_line2_unit_part(self):
-        line = StaticDividingLine('+-0987654321!@#$%^&*()_')
-        self.assertEqual(line.get_unit_part(), '+')
+
+def test_static_dividing_line_generates_custom_length_with_formatting() -> None:
+    line = StaticDividingLine('-', length=5)
+    assert line.get_full_static_line(is_override=False) == '\n[dim]-----[/dim]\n'
+
+
+# ============================================================================
+# Tests for StaticDividingLine - unit part extraction
+# ============================================================================
+
+
+def test_static_dividing_line_returns_space_for_empty_unit() -> None:
+    line = StaticDividingLine('')
+    assert line.get_unit_part() == ' '
+
+
+def test_static_dividing_line_returns_first_character_as_unit() -> None:
+    line = StaticDividingLine('+-0987654321!@#$%^&*()_')
+    assert line.get_unit_part() == '+'
+
+
+# ============================================================================
+# Tests for DynamicDividingLine - full line generation
+# ============================================================================
+
+
+def test_dynamic_dividing_line_generates_line_with_specified_length_and_override() -> None:
+    line = DynamicDividingLine()
+    assert line.get_full_dynamic_line(length=20, is_override=True).count('-') == 20
+
+
+def test_dynamic_dividing_line_generates_line_with_specified_length_and_formatting() -> None:
+    line = DynamicDividingLine()
+    assert line.get_full_dynamic_line(length=5, is_override=False) == '\n[dim]-----[/dim]\n'
+
+
+# ============================================================================
+# Tests for DynamicDividingLine - unit part extraction
+# ============================================================================
+
+
+def test_dynamic_dividing_line_returns_space_for_empty_unit() -> None:
+    line = DynamicDividingLine('')
+    assert line.get_unit_part() == ' '
+
+
+def test_dynamic_dividing_line_returns_first_character_as_unit() -> None:
+    line = DynamicDividingLine('45n352834528&^%@&*T$G')
+    assert line.get_unit_part() == '4'
@@ -1,129 +1,314 @@
 import re
-import unittest
+
+import pytest

 from argenta.command.flag import Flag, InputFlag, PossibleValues
 from argenta.command.flag.flags import Flags, InputFlags


-class TestFlag(unittest.TestCase):
-    def test_get_string_entity(self):
-        self.assertEqual(Flag(name='test').string_entity,
-                         '--test')
-
-    def test_get_string_entity2(self):
-        self.assertEqual(Flag(name='test',
-                              prefix='---').string_entity,
-                         '---test')
-
-    def test_get_flag_name(self):
-        self.assertEqual(Flag(name='test').name,
-                         'test')
-
-    def test_get_flag_prefix(self):
-        self.assertEqual(Flag(name='test').prefix,
-                         '--')
-
-    def test_get_flag_prefix2(self):
-        self.assertEqual(Flag(name='test',
-                              prefix='--').prefix,
-                         '--')
-
-    def test_get_flag_value_without_set(self):
-        self.assertEqual(InputFlag(name='test', input_value='', status=None).input_value,
-            '')
-
-    def test_get_flag_value_with_set(self):
-        flag = InputFlag(name='test', input_value='example', status=None)
-        self.assertEqual(flag.input_value, 'example')
-
-    def test_validate_incorrect_flag_value_with_list_of_possible_flag_values(self):
-        flag = Flag(name='test', possible_values=['1', '2', '3'])
-        self.assertEqual(flag.validate_input_flag_value('bad value'), False)
-
-    def test_validate_correct_flag_value_with_list_of_possible_flag_values(self):
-        flag = Flag(name='test', possible_values=['1', '2', '3'])
-        self.assertEqual(flag.validate_input_flag_value('1'), True)
-
-    def test_validate_incorrect_flag_value_with_pattern_of_possible_flag_values(self):
-        flag = Flag(name='test', possible_values=re.compile(r'192.168.\d+.\d+'))
-        self.assertEqual(flag.validate_input_flag_value('152.123.9.8'), False)
-
-    def test_validate_correct_flag_value_with_pattern_of_possible_flag_values(self):
-        flag = Flag(name='test', possible_values=re.compile(r'192.168.\d+.\d+'))
-        self.assertEqual(flag.validate_input_flag_value('192.168.9.8'), True)
-
-    def test_validate_correct_empty_flag_value_without_possible_flag_values(self):
-        flag = Flag(name='test', possible_values=PossibleValues.NEITHER)
-        self.assertEqual(flag.validate_input_flag_value(''), True)
-
-    def test_validate_correct_empty_flag_value_with_possible_flag_values(self):
-        flag = Flag(name='test', possible_values=PossibleValues.NEITHER)
-        self.assertEqual(flag.validate_input_flag_value(''), True)
-
-    def test_validate_incorrect_random_flag_value_without_possible_flag_values(self):
-        flag = Flag(name='test', possible_values=PossibleValues.NEITHER)
-        self.assertEqual(flag.validate_input_flag_value('random value'), False)
-
-    def test_validate_correct_random_flag_value_with_possible_flag_values(self):
-        flag = Flag(name='test', possible_values=PossibleValues.ALL)
-        self.assertEqual(flag.validate_input_flag_value('random value'), True)
-
-    def test_get_input_flag1(self):
-        flag = InputFlag(name='test', input_value='', status=None)
-        input_flags = InputFlags([flag])
-        self.assertEqual(input_flags.get_flag_by_name('test'), flag)
-
-    def test_get_input_flag2(self):
-        flag = InputFlag(name='test', input_value='', status=None)
-        flag2 = InputFlag(name='some', input_value='', status=None)
-        input_flags = InputFlags([flag, flag2])
-        self.assertEqual(input_flags.get_flag_by_name('some'), flag2)
-
-    def test_get_undefined_input_flag(self):
-        flag = InputFlag(name='test', input_value='', status=None)
-        flag2 = InputFlag(name='some', input_value='', status=None)
-        input_flags = InputFlags([flag, flag2])
-        self.assertEqual(input_flags.get_flag_by_name('case'), None)
-
-    def test_get_flags(self):
-        flags = Flags()
-        list_of_flags = [
-            Flag('test1'),
-            Flag('test2'),
-            Flag('test3'),
-        ]
-        flags.add_flags(list_of_flags)
-        self.assertEqual(flags.flags,
-                         list_of_flags)
-
-    def test_add_flag(self):
-        flags = Flags()
-        flags.add_flag(Flag('test'))
-        self.assertEqual(len(flags.flags), 1)
-
-    def test_add_flags(self):
-        flags = Flags()
-        flags.add_flags([Flag('test'), Flag('test2')])
-        self.assertEqual(len(flags.flags), 2)
+# ============================================================================
+# Tests for Flag - basic properties
+# ============================================================================


+def test_flag_string_entity_with_default_prefix() -> None:
+    assert Flag(name='test').string_entity == '--test'


+def test_flag_string_entity_with_custom_prefix() -> None:
+    assert Flag(name='test', prefix='---').string_entity == '---test'


+def test_flag_name_property() -> None:
+    assert Flag(name='test').name == 'test'


+def test_flag_prefix_property_default() -> None:
+    assert Flag(name='test').prefix == '--'


+def test_flag_prefix_property_custom() -> None:
+    assert Flag(name='test', prefix='--').prefix == '--'


+# ============================================================================
+# Tests for Flag - string representations
+# ============================================================================


+def test_flag_str_representation() -> None:
+    flag = Flag('two')
+    assert str(flag) == '--two'


+def test_flag_repr_representation() -> None:
+    flag = Flag('two')
+    assert repr(flag) == 'Flag<name=two, prefix=-->'


+def test_flag_equality_with_non_flag_raises_error() -> None:
+    flag = Flag('two')
+    not_flag = object()
+    with pytest.raises(NotImplementedError):
+        flag == not_flag  # pyright: ignore[reportUnusedExpression]


+# ============================================================================
+# Tests for Flag - value validation with list of possible values
+# ============================================================================


+def test_flag_validates_value_in_allowed_list() -> None:
+    flag = Flag(name='test', possible_values=['1', '2', '3'])
+    assert flag.validate_input_flag_value('1') is True
+
+
+def test_flag_rejects_value_not_in_allowed_list() -> None:
+    flag = Flag(name='test', possible_values=['1', '2', '3'])
+    assert flag.validate_input_flag_value('bad value') is False
+
+
+# ============================================================================
+# Tests for Flag - value validation with regex pattern
+# ============================================================================
+
+
+def test_flag_validates_value_matching_regex_pattern() -> None:
+    flag = Flag(name='test', possible_values=re.compile(r'192.168.\d+.\d+'))
+    assert flag.validate_input_flag_value('192.168.9.8') is True
+
+
+def test_flag_rejects_value_not_matching_regex_pattern() -> None:
+    flag = Flag(name='test', possible_values=re.compile(r'192.168.\d+.\d+'))
+    assert flag.validate_input_flag_value('152.123.9.8') is False
+
+
+# ============================================================================
+# Tests for Flag - value validation with NEITHER and ALL
+# ============================================================================
+
+
+def test_flag_validates_empty_value_when_neither_allowed() -> None:
+    flag = Flag(name='test', possible_values=PossibleValues.NEITHER)
+    assert flag.validate_input_flag_value('') is True
+
+
+def test_flag_rejects_non_empty_value_when_neither_allowed() -> None:
+    flag = Flag(name='test', possible_values=PossibleValues.NEITHER)
+    assert flag.validate_input_flag_value('random value') is False
+
+
+def test_flag_validates_any_value_when_all_allowed() -> None:
+    flag = Flag(name='test', possible_values=PossibleValues.ALL)
+    assert flag.validate_input_flag_value('random value') is True
+
+
+# ============================================================================
+# Tests for InputFlag - basic properties
+# ============================================================================
+
+
+def test_input_flag_stores_empty_value() -> None:
+    assert InputFlag(name='test', input_value='', status=None).input_value == ''
+
+
+def test_input_flag_stores_provided_value() -> None:
+    flag = InputFlag(name='test', input_value='example', status=None)
+    assert flag.input_value == 'example'
+
+
+# ============================================================================
+# Tests for InputFlag - string representations
+# ============================================================================
+
+
+def test_input_flag_str_representation() -> None:
+    flag = InputFlag('two', input_value='value')
+    assert str(flag) == '--two value'
+
+
+def test_input_flag_repr_representation() -> None:
+    flag = InputFlag('two', input_value='some_value')
+    assert repr(flag) == 'InputFlag<name=two, prefix=--, value=some_value, status=None>'
+
+
+def test_input_flag_equality_with_non_flag_raises_error() -> None:
+    flag = InputFlag('two', input_value='')
+    not_flag = object()
+    with pytest.raises(NotImplementedError):
+        flag == not_flag  # pyright: ignore[reportUnusedExpression]
+
+
+# ============================================================================
+# Tests for InputFlags collection - retrieval
+# ============================================================================
+
+
+def test_input_flags_get_by_name_finds_single_flag() -> None:
+    flag = InputFlag(name='test', input_value='', status=None)
+    input_flags = InputFlags([flag])
+    assert input_flags.get_flag_by_name('test') == flag
+
+
+def test_input_flags_get_by_name_finds_flag_in_multiple() -> None:
+    flag = InputFlag(name='test', input_value='', status=None)
+    flag2 = InputFlag(name='some', input_value='', status=None)
+    input_flags = InputFlags([flag, flag2])
+    assert input_flags.get_flag_by_name('some') == flag2
+
+
+def test_input_flags_get_by_name_returns_none_for_missing_flag() -> None:
+    flag = InputFlag(name='test', input_value='', status=None)
+    flag2 = InputFlag(name='some', input_value='', status=None)
+    input_flags = InputFlags([flag, flag2])
+    assert input_flags.get_flag_by_name('case') is None
+
+
+# ============================================================================
+# Tests for InputFlags collection - equality and containment
+# ============================================================================
+
+
+def test_input_flags_not_equal_when_different_length() -> None:
+    flags = InputFlags([InputFlag('some', input_value='')])
+    flags2 = InputFlags([
+        InputFlag('some', input_value=''), 
+        InputFlag('some2', input_value='')
+    ])
+    assert flags != flags2
+
+
+def test_input_flags_not_equal_to_non_input_flags() -> None:
+    flags = InputFlags([InputFlag('some', input_value='')])
+    not_flags = object()
+    assert flags != not_flags
+
+
+def test_input_flags_contains_existing_flag() -> None:
+    flag = InputFlag('some', input_value='')
+    flags = InputFlags([flag])
+    assert flag in flags
+
+
+def test_input_flags_does_not_contain_missing_flag() -> None:
+    flags = InputFlags([InputFlag('some', input_value='')])
+    flag = InputFlag('nonexists', input_value='')
+    assert flag not in flags
+
+
+def test_input_flags_contains_raises_error_for_non_flag() -> None:
+    flags = InputFlags([InputFlag('some', input_value='')])
+    not_flag = object
+    with pytest.raises(TypeError):
+        not_flag in flags  # pyright: ignore[reportUnusedExpression]
+
+
+# ============================================================================
+# Tests for Flags collection - adding flags
+# ============================================================================
+
+
+def test_flags_add_single_flag() -> None:
+    flags = Flags()
+    flags.add_flag(Flag('test'))
+    assert len(flags.flags) == 1
+
+
+def test_flags_add_multiple_flags() -> None:
+    flags = Flags()
+    flags.add_flags([Flag('test'), Flag('test2')])
+    assert len(flags.flags) == 2
+
+
+def test_flags_stores_added_flags() -> None:
+    flags = Flags()
+    list_of_flags = [
+        Flag('test1'),
+        Flag('test2'),
+        Flag('test3'),
+    ]
+    flags.add_flags(list_of_flags)
+    assert flags.flags == list_of_flags
+
+
+# ============================================================================
+# Tests for Flags collection - retrieval
+# ============================================================================
+
+
+def test_flags_get_by_name_finds_flag() -> None:
+    flags = Flags([Flag('some')])
+    assert flags.get_flag_by_name('some') == Flag('some')
+
+
+# ============================================================================
+# Tests for Flags collection - equality and containment
+# ============================================================================
+
+
+def test_flags_equal_when_same_flags() -> None:
+    flags = Flags([Flag('some')])
+    flags2 = Flags([Flag('some')])
+    assert flags == flags2
+
+
+def test_flags_not_equal_when_different_flags() -> None:
+    flags = Flags([Flag('some')])
+    flags2 = Flags([Flag('other')])
+    assert flags != flags2
+
+
+def test_flags_not_equal_when_different_length() -> None:
+    flags = Flags([Flag('some')])
+    flags2 = Flags([Flag('some'), Flag('other')])
+    assert flags != flags2
+
+
+def test_flags_not_equal_to_non_flags() -> None:
+    flags = Flags([Flag('some')])
+    not_flags = object()
+    assert flags != not_flags
+
+
+def test_flags_contains_existing_flag() -> None:
+    flags = Flags([Flag('some')])
+    flag = Flag('some')
+    assert flag in flags
+
+
+def test_flags_does_not_contain_missing_flag() -> None:
+    flags = Flags([Flag('some')])
+    flag = Flag('nonexists')
+    assert flag not in flags
+
+
+def test_flags_contains_raises_error_for_non_flag() -> None:
+    flags = Flags([Flag('some')])
+    not_flag = object
+    with pytest.raises(TypeError):
+        not_flag in flags  # pyright: ignore[reportUnusedExpression]
+
+
+# ============================================================================
+# Tests for Flags collection - special methods
+# ============================================================================
+
+
+def test_flags_len_returns_count() -> None:
+    flags = Flags([Flag('one'), Flag('two')])
+    assert len(flags) == 2
+
+
+def test_flags_bool_returns_true_when_not_empty() -> None:
+    flags = Flags([Flag('one'), Flag('two')])
+    assert bool(flags)
+
+
+def test_flags_bool_returns_false_when_empty() -> None:
+    flags = Flags([])
+    assert not bool(flags)
+
+
+def test_flags_getitem_returns_flag_at_index() -> None:
+    flags = Flags([Flag('one'), Flag('two')])
+    assert flags[1] == Flag('two')
@@ -0,0 +1,259 @@
+import pytest
+from dishka import Provider
+from pytest_mock import MockerFixture
+
+from argenta import App, Router
+from argenta.command import Command
+from argenta.orchestrator import Orchestrator
+from argenta.orchestrator.argparser import ArgParser
+from argenta.response import Response
+
+
+# ============================================================================
+# Fixtures
+# ============================================================================
+
+
+@pytest.fixture
+def mock_argparser(mocker: MockerFixture) -> ArgParser:
+    """Create a mock ArgParser that doesn't actually parse sys.argv"""
+    argparser = ArgParser(processed_args=[])
+    mocker.patch.object(argparser, '_parse_args')
+    return argparser
+
+
+@pytest.fixture
+def sample_app() -> App:
+    """Create a sample App for testing"""
+    return App(override_system_messages=True)
+
+
+@pytest.fixture
+def sample_router() -> Router:
+    """Create a sample Router with a test command"""
+    router = Router()
+    
+    @router.command(Command('test'))
+    def handler(_res: Response) -> None:
+        print('test command executed')
+    
+    return router
+
+
+# ============================================================================
+# Tests for Orchestrator initialization
+# ============================================================================
+
+
+def test_orchestrator_initializes_with_default_argparser(mocker: MockerFixture) -> None:
+    """Test Orchestrator initialization with default ArgParser"""
+    mocker.patch('sys.argv', ['test_program'])
+    orchestrator = Orchestrator()
+    assert orchestrator._arg_parser is not None
+    assert isinstance(orchestrator._arg_parser, ArgParser)
+
+
+def test_orchestrator_initializes_with_custom_argparser(mock_argparser: ArgParser) -> None:
+    """Test Orchestrator initialization with custom ArgParser"""
+    orchestrator = Orchestrator(arg_parser=mock_argparser)
+    assert orchestrator._arg_parser is mock_argparser
+
+
+def test_orchestrator_initializes_with_custom_providers(mocker: MockerFixture) -> None:
+    """Test Orchestrator initialization with custom providers"""
+    mocker.patch('sys.argv', ['test_program'])
+    custom_provider = Provider()
+    orchestrator = Orchestrator(custom_providers=[custom_provider])
+    assert custom_provider in orchestrator._custom_providers
+
+
+def test_orchestrator_initializes_with_auto_inject_disabled(mocker: MockerFixture) -> None:
+    """Test Orchestrator initialization with auto_inject_handlers disabled"""
+    mocker.patch('sys.argv', ['test_program'])
+    orchestrator = Orchestrator(auto_inject_handlers=False)
+    assert orchestrator._auto_inject_handlers is False
+
+
+def test_orchestrator_initializes_with_auto_inject_enabled(mocker: MockerFixture) -> None:
+    """Test Orchestrator initialization with auto_inject_handlers enabled (default)"""
+    mocker.patch('sys.argv', ['test_program'])
+    orchestrator = Orchestrator()
+    assert orchestrator._auto_inject_handlers is True
+
+
+def test_orchestrator_parses_args_on_initialization(mocker: MockerFixture, mock_argparser: ArgParser) -> None:
+    """Test that Orchestrator calls _parse_args on initialization"""
+    parse_spy = mocker.spy(mock_argparser, '_parse_args')
+    _orchestrator = Orchestrator(arg_parser=mock_argparser)
+    parse_spy.assert_called_once()
+
+
+# ============================================================================
+# Tests for start_polling method
+# ============================================================================
+
+
+def test_start_polling_creates_dishka_container(
+    mocker: MockerFixture, mock_argparser: ArgParser, sample_app: App
+) -> None:
+    """Test that start_polling creates a dishka container"""
+    mock_make_container = mocker.patch('argenta.orchestrator.entity.make_container')
+    _mock_setup_dishka = mocker.patch('argenta.orchestrator.entity.setup_dishka')
+    mocker.patch.object(sample_app, 'run_polling')
+    
+    orchestrator = Orchestrator(arg_parser=mock_argparser)
+    orchestrator.start_polling(sample_app)
+    
+    mock_make_container.assert_called_once()
+    assert mock_make_container.call_args[1]['context'] == {ArgParser: mock_argparser}
+
+
+def test_start_polling_calls_setup_dishka_with_auto_inject_enabled(
+    mocker: MockerFixture, mock_argparser: ArgParser, sample_app: App
+) -> None:
+    """Test that start_polling calls setup_dishka with auto_inject=True"""
+    mock_container = mocker.MagicMock()  # pyright: ignore[reportUnknownMemberType, reportUnknownVariableType]
+    mocker.patch('argenta.orchestrator.entity.make_container', return_value=mock_container)
+    mock_setup_dishka = mocker.patch('argenta.orchestrator.entity.setup_dishka')
+    mocker.patch.object(sample_app, 'run_polling')
+    
+    orchestrator = Orchestrator(arg_parser=mock_argparser, auto_inject_handlers=True)
+    orchestrator.start_polling(sample_app)
+    
+    mock_setup_dishka.assert_called_once_with(sample_app, mock_container, auto_inject=True)
+
+
+def test_start_polling_calls_setup_dishka_with_auto_inject_disabled(
+    mocker: MockerFixture, mock_argparser: ArgParser, sample_app: App
+) -> None:
+    """Test that start_polling calls setup_dishka with auto_inject=False"""
+    mock_container = mocker.MagicMock()  # pyright: ignore[reportUnknownMemberType, reportUnknownVariableType]
+    mocker.patch('argenta.orchestrator.entity.make_container', return_value=mock_container)
+    mock_setup_dishka = mocker.patch('argenta.orchestrator.entity.setup_dishka')
+    mocker.patch.object(sample_app, 'run_polling')
+    
+    orchestrator = Orchestrator(arg_parser=mock_argparser, auto_inject_handlers=False)
+    orchestrator.start_polling(sample_app)
+    
+    mock_setup_dishka.assert_called_once_with(sample_app, mock_container, auto_inject=False)
+
+
+def test_start_polling_calls_app_run_polling(
+    mocker: MockerFixture, mock_argparser: ArgParser, sample_app: App
+) -> None:
+    """Test that start_polling calls app.run_polling()"""
+    mocker.patch('argenta.orchestrator.entity.make_container')
+    mocker.patch('argenta.orchestrator.entity.setup_dishka')
+    mock_run_polling = mocker.patch.object(sample_app, 'run_polling')
+    
+    orchestrator = Orchestrator(arg_parser=mock_argparser)
+    orchestrator.start_polling(sample_app)
+    
+    mock_run_polling.assert_called_once()
+
+
+def test_start_polling_includes_custom_providers_in_container(
+    mocker: MockerFixture, mock_argparser: ArgParser, sample_app: App
+) -> None:
+    """Test that start_polling includes custom providers in container"""
+    custom_provider = Provider()
+    mock_make_container = mocker.patch('argenta.orchestrator.entity.make_container')
+    mocker.patch('argenta.orchestrator.entity.setup_dishka')
+    mocker.patch.object(sample_app, 'run_polling')
+    
+    orchestrator = Orchestrator(arg_parser=mock_argparser, custom_providers=[custom_provider])
+    orchestrator.start_polling(sample_app)
+    
+    # Check that custom_provider was passed to make_container
+    call_args = mock_make_container.call_args[0]
+    assert custom_provider in call_args
+
+
+# ============================================================================
+# Tests for integration with App
+# ============================================================================
+
+
+def test_orchestrator_integrates_with_app_with_router(
+    mocker: MockerFixture, mock_argparser: ArgParser, sample_app: App, sample_router: Router
+) -> None:
+    """Test that Orchestrator properly integrates with App that has routers"""
+    mocker.patch('argenta.orchestrator.entity.make_container')
+    mocker.patch('argenta.orchestrator.entity.setup_dishka')
+    mock_run_polling = mocker.patch.object(sample_app, 'run_polling')
+    
+    sample_app.include_router(sample_router)
+    
+    orchestrator = Orchestrator(arg_parser=mock_argparser)
+    orchestrator.start_polling(sample_app)
+    
+    mock_run_polling.assert_called_once()
+    assert len(sample_app.registered_routers.registered_routers) == 1
+
+
+# ============================================================================
+# Tests for ArgParser integration
+# ============================================================================
+
+
+def test_orchestrator_passes_argparser_to_container_context(
+    mocker: MockerFixture, mock_argparser: ArgParser, sample_app: App
+) -> None:
+    """Test that Orchestrator passes ArgParser instance to container context"""
+    mock_make_container = mocker.patch('argenta.orchestrator.entity.make_container')
+    mocker.patch('argenta.orchestrator.entity.setup_dishka')
+    mocker.patch.object(sample_app, 'run_polling')
+    
+    orchestrator = Orchestrator(arg_parser=mock_argparser)
+    orchestrator.start_polling(sample_app)
+    
+    # Verify that ArgParser was passed in context
+    call_kwargs = mock_make_container.call_args[1]
+    assert 'context' in call_kwargs
+    assert ArgParser in call_kwargs['context']
+    assert call_kwargs['context'][ArgParser] is mock_argparser
+
+
+# ============================================================================
+# Tests for error handling
+# ============================================================================
+
+
+def test_orchestrator_handles_app_run_polling_exception(
+    mocker: MockerFixture, mock_argparser: ArgParser, sample_app: App
+) -> None:
+    """Test that Orchestrator propagates exceptions from app.run_polling()"""
+    mocker.patch('argenta.orchestrator.entity.make_container')
+    mocker.patch('argenta.orchestrator.entity.setup_dishka')
+    mocker.patch.object(sample_app, 'run_polling', side_effect=RuntimeError("Test error"))
+    
+    orchestrator = Orchestrator(arg_parser=mock_argparser)
+    
+    with pytest.raises(RuntimeError, match="Test error"):
+        orchestrator.start_polling(sample_app)
+
+
+# ============================================================================
+# Tests for multiple providers
+# ============================================================================
+
+
+def test_orchestrator_accepts_multiple_custom_providers(
+    mocker: MockerFixture, mock_argparser: ArgParser, sample_app: App
+) -> None:
+    """Test that Orchestrator accepts multiple custom providers"""
+    provider1 = Provider()
+    provider2 = Provider()
+    mock_make_container = mocker.patch('argenta.orchestrator.entity.make_container')
+    mocker.patch('argenta.orchestrator.entity.setup_dishka')
+    mocker.patch.object(sample_app, 'run_polling')
+    
+    orchestrator = Orchestrator(
+        arg_parser=mock_argparser,
+        custom_providers=[provider1, provider2]
+    )
+    orchestrator.start_polling(sample_app)
+    
+    call_args = mock_make_container.call_args[0]
+    assert provider1 in call_args
+    assert provider2 in call_args
@@ -1,103 +1,144 @@
-import unittest
 from datetime import date, datetime

-from argenta.data_bridge import DataBridge
-from argenta.command.flag.models import InputFlag
+import pytest
+
 from argenta.command.flag.flags.models import InputFlags
+from argenta.command.flag.models import InputFlag
+from argenta.data_bridge import DataBridge
 from argenta.response.entity import EMPTY_INPUT_FLAGS, Response
 from argenta.response.status import ResponseStatus


-class TestDataBridge(unittest.TestCase):
-    def setUp(self):
-        """Create a new DataBridge instance for each test"""
-        self.data_bridge = DataBridge()
-
-    def test_update_data_basic(self):
-        """Test basic data update functionality"""
-        test_data = {"key1": "value1", "key2": "value2"}
-        self.data_bridge.update(test_data)
-        self.assertEqual(self.data_bridge.get_all(), test_data)
-
-    def test_update_data_with_datetime(self):
-        """Test updating data with datetime objects"""
-        test_datetime = datetime(2024, 1, 15, 10, 30, 45)
-        test_data = {"created_at": test_datetime, "name": "test"}
-        self.data_bridge.update(test_data)
-
-        result = self.data_bridge.get_all()
-        self.assertEqual(result["created_at"], test_datetime)
-        self.assertEqual(result["name"], "test")
-
-    def test_update_data_multiple_calls(self):
-        """Test multiple update calls merge data"""
-        first_data = {"key1": "value1"}
-        second_data = {"key2": "value2"}
-        self.data_bridge.update(first_data)
-        self.data_bridge.update(second_data)
-        self.assertEqual(len(self.data_bridge.get_all()), 2)
-
-    def test_get_data_empty(self):
-        """Test get_all returns empty dict when no data"""
-        self.assertEqual(self.data_bridge.get_all(), {})
-
-    def test_clear_data(self):
-        """Test clear_all removes all data"""
-        self.data_bridge.update({"key": "value"})
-        self.assertNotEqual(self.data_bridge.get_all(), {})
-        self.data_bridge.clear_all()
-        self.assertEqual(self.data_bridge.get_all(), {})
-
-    def test_delete_from_data(self):
-        """Test delete_by_key removes specific key"""
-        test_data = {"key1": "value1", "key2": "value2"}
-        self.data_bridge.update(test_data)
-        self.data_bridge.delete_by_key("key1")
-        result = self.data_bridge.get_all()
-        self.assertNotIn("key1", result)
-        self.assertIn("key2", result)
-
-    def test_delete_from_data_nonexistent_key(self):
-        """Test delete_by_key with nonexistent key raises KeyError"""
-        with self.assertRaises(KeyError):
-            self.data_bridge.delete_by_key("nonexistent_key")
-
-    def test_get_by_key(self):
-        """Test get_by_key retrieves correct value"""
-        test_data = {"key1": "value1", "key2": date(2024, 1, 1)}
-        self.data_bridge.update(test_data)
-        self.assertEqual(self.data_bridge.get_by_key("key1"), "value1")
-        self.assertEqual(self.data_bridge.get_by_key("key2"), date(2024, 1, 1))
-        self.assertIsNone(self.data_bridge.get_by_key("nonexistent"))
+# ============================================================================
+# Fixtures
+# ============================================================================


-class TestResponse(unittest.TestCase):
-    def test_response_initialization_basic(self):
-        """Test basic Response initialization"""
-        response = Response(ResponseStatus.ALL_FLAGS_VALID)
-        self.assertEqual(response.status, ResponseStatus.ALL_FLAGS_VALID)
-        self.assertEqual(response.input_flags, EMPTY_INPUT_FLAGS)
-
-    def test_response_initialization_with_flags(self):
-        """Test Response initialization with input flags"""
-        input_flags = InputFlags([InputFlag('test', input_value='value', status=None)])
-        response = Response(ResponseStatus.INVALID_VALUE_FLAGS, input_flags)
-        self.assertEqual(response.status, ResponseStatus.INVALID_VALUE_FLAGS)
-        self.assertEqual(response.input_flags, input_flags)
-
-    def test_response_status_types(self):
-        """Test Response with different status types"""
-        statuses = [
-            ResponseStatus.ALL_FLAGS_VALID,
-            ResponseStatus.UNDEFINED_FLAGS,
-            ResponseStatus.INVALID_VALUE_FLAGS,
-            ResponseStatus.UNDEFINED_AND_INVALID_FLAGS
-        ]
-        for status in statuses:
-            with self.subTest(status=status):
-                response = Response(status)
-                self.assertEqual(response.status, status)
+@pytest.fixture
+def data_bridge() -> DataBridge:
+    """Create a new DataBridge instance for each test"""
+    return DataBridge()


-if __name__ == '__main__':
-    unittest.main()
+# ============================================================================
+# Tests for DataBridge - basic data operations
+# ============================================================================
+
+
+def test_databridge_update_stores_basic_data(data_bridge: DataBridge) -> None:
+    """Test basic data update functionality"""
+    test_data = {"key1": "value1", "key2": "value2"}
+    data_bridge.update(test_data)
+    assert data_bridge.get_all() == test_data
+
+
+def test_databridge_update_stores_datetime_objects(data_bridge: DataBridge) -> None:
+    """Test updating data with datetime objects"""
+    test_datetime = datetime(2024, 1, 15, 10, 30, 45)
+    test_data = {"created_at": test_datetime, "name": "test"}
+    data_bridge.update(test_data)
+
+    result = data_bridge.get_all()
+    assert result["created_at"] == test_datetime
+    assert result["name"] == "test"
+
+
+def test_databridge_multiple_updates_merge_data(data_bridge: DataBridge) -> None:
+    """Test multiple update calls merge data"""
+    first_data = {"key1": "value1"}
+    second_data = {"key2": "value2"}
+    data_bridge.update(first_data)
+    data_bridge.update(second_data)
+    assert len(data_bridge.get_all()) == 2
+
+
+# ============================================================================
+# Tests for DataBridge - data retrieval
+# ============================================================================
+
+
+def test_databridge_get_all_returns_empty_dict_initially(data_bridge: DataBridge) -> None:
+    """Test get_all returns empty dict when no data"""
+    assert data_bridge.get_all() == {}
+
+
+def test_databridge_get_by_key_retrieves_correct_values(data_bridge: DataBridge) -> None:
+    """Test get_by_key retrieves correct value"""
+    test_data = {"key1": "value1", "key2": date(2024, 1, 1)}
+    data_bridge.update(test_data)
+    assert data_bridge.get_by_key("key1") == "value1"
+    assert data_bridge.get_by_key("key2") == date(2024, 1, 1)
+
+
+def test_databridge_get_by_key_returns_none_for_missing_key(data_bridge: DataBridge) -> None:
+    """Test get_by_key returns None for nonexistent key"""
+    test_data = {"key1": "value1"}
+    data_bridge.update(test_data)
+    assert data_bridge.get_by_key("nonexistent") is None
+
+
+# ============================================================================
+# Tests for DataBridge - data deletion
+# ============================================================================
+
+
+def test_databridge_clear_all_removes_all_data(data_bridge: DataBridge) -> None:
+    """Test clear_all removes all data"""
+    data_bridge.update({"key": "value"})
+    assert data_bridge.get_all() != {}
+    data_bridge.clear_all()
+    assert data_bridge.get_all() == {}
+
+
+def test_databridge_delete_by_key_removes_specific_key(data_bridge: DataBridge) -> None:
+    """Test delete_by_key removes specific key"""
+    test_data = {"key1": "value1", "key2": "value2"}
+    data_bridge.update(test_data)
+    data_bridge.delete_by_key("key1")
+    result = data_bridge.get_all()
+    assert "key1" not in result
+    assert "key2" in result
+
+
+def test_databridge_delete_by_key_raises_error_for_missing_key(data_bridge: DataBridge) -> None:
+    """Test delete_by_key with nonexistent key raises KeyError"""
+    with pytest.raises(KeyError):
+        data_bridge.delete_by_key("nonexistent_key")
+
+
+# ============================================================================
+# Tests for Response - initialization
+# ============================================================================
+
+
+def test_response_initializes_with_status_and_empty_flags() -> None:
+    """Test basic Response initialization"""
+    response = Response(ResponseStatus.ALL_FLAGS_VALID)
+    assert response.status == ResponseStatus.ALL_FLAGS_VALID
+    assert response.input_flags == EMPTY_INPUT_FLAGS
+
+
+def test_response_initializes_with_status_and_input_flags() -> None:
+    """Test Response initialization with input flags"""
+    input_flags = InputFlags([InputFlag('test', input_value='value', status=None)])
+    response = Response(ResponseStatus.INVALID_VALUE_FLAGS, input_flags)
+    assert response.status == ResponseStatus.INVALID_VALUE_FLAGS
+    assert response.input_flags == input_flags
+
+
+# ============================================================================
+# Tests for Response - status types
+# ============================================================================
+
+
+def test_response_accepts_all_status_types() -> None:
+    """Test Response with different status types"""
+    statuses = [
+        ResponseStatus.ALL_FLAGS_VALID,
+        ResponseStatus.UNDEFINED_FLAGS,
+        ResponseStatus.INVALID_VALUE_FLAGS,
+        ResponseStatus.UNDEFINED_AND_INVALID_FLAGS
+    ]
+    for status in statuses:
+        response = Response(status)
+        assert response.status == status
@@ -1,103 +1,208 @@
 import re
-import unittest

-from argenta.command import Command
+import pytest
+from pytest import CaptureFixture
+
+from argenta.command import Command, InputCommand
 from argenta.command.flag import Flag, InputFlag
 from argenta.command.flag.flags import Flags, InputFlags
 from argenta.command.flag.models import PossibleValues, ValidationStatus
 from argenta.response.entity import Response
 from argenta.router import Router
-from argenta.router.entity import _structuring_input_flags, _validate_command, _validate_func_args  # pyright: ignore[reportPrivateUsage]
-from argenta.router.exceptions import (RepeatedFlagNameException,
-                                       RequiredArgumentNotPassedException,
-                                       TriggerContainSpacesException)
+from argenta.router.entity import _structuring_input_flags, _validate_func_args  # pyright: ignore[reportPrivateUsage]
+from argenta.router.exceptions import (
+    RepeatedFlagNameException,
+    RequiredArgumentNotPassedException,
+    TriggerContainSpacesException,
+)


-class TestRouter(unittest.TestCase):
-    def test_register_command_with_spaces_in_trigger(self):
-        with self.assertRaises(TriggerContainSpacesException):
-            _validate_command(Command(trigger='command with spaces'))
+# ============================================================================
+# Tests for command validation
+# ============================================================================

-    def test_register_command_with_repeated_flags(self):
-        with self.assertRaises(RepeatedFlagNameException):
-            _validate_command(Command(trigger='command', flags=Flags([Flag('test'), Flag('test')])))

-    def test_structuring_input_flags1(self):
-        cmd = Command('cmd')
-        input_flags = InputFlags([InputFlag('ssh', input_value=None, status=None)])
-        self.assertEqual(_structuring_input_flags(cmd, input_flags).input_flags, InputFlags([InputFlag('ssh', input_value=None, status=ValidationStatus.UNDEFINED)]))
+def test_validate_command_raises_error_for_trigger_with_spaces() -> None:
+    router = Router()
+    with pytest.raises(TriggerContainSpacesException):
+        router._validate_command(Command(trigger='command with spaces'))

-    def test_structuring_input_flags2(self):
-        cmd = Command('cmd')
-        input_flags = InputFlags([InputFlag('ssh', input_value='some', status=None)])
-        self.assertEqual(_structuring_input_flags(cmd, input_flags).input_flags, InputFlags([InputFlag('ssh', input_value='some', status=ValidationStatus.UNDEFINED)]))

-    def test_structuring_input_flags3(self):
-        cmd = Command('cmd', flags=Flag('port'))
-        input_flags = InputFlags([InputFlag('ssh', input_value='some2', status=None)])
-        self.assertEqual(_structuring_input_flags(cmd, input_flags).input_flags, InputFlags([InputFlag('ssh', input_value='some2', status=ValidationStatus.UNDEFINED)]))
+def test_validate_command_raises_error_for_repeated_flag_names() -> None:
+    router = Router()
+    with pytest.raises(RepeatedFlagNameException):
+        router._validate_command(Command(trigger='command', flags=Flags([Flag('test'), Flag('test')])))

-    def test_structuring_input_flags4(self):
-        command = Command('cmd', flags=Flag('ssh', possible_values=PossibleValues.NEITHER))
-        input_flags = InputFlags([InputFlag('ssh', input_value='some3', status=None)])
-        self.assertEqual(_structuring_input_flags(command, input_flags).input_flags, InputFlags([InputFlag('ssh', input_value='some3', status=ValidationStatus.INVALID)]))

-    def test_structuring_input_flags5(self):
-        command = Command('cmd', flags=Flag('ssh', possible_values=re.compile(r'some[1-5]$')))
-        input_flags = InputFlags([InputFlag('ssh', input_value='some40', status=None)])
-        self.assertEqual(_structuring_input_flags(command, input_flags).input_flags, InputFlags([InputFlag('ssh', input_value='some40', status=ValidationStatus.INVALID)]))
+# ============================================================================
+# Tests for function argument validation
+# ============================================================================

-    def test_structuring_input_flags6(self):
-        command = Command('cmd', flags=Flag('ssh', possible_values=['example']))
-        input_flags = InputFlags([InputFlag('ssh', input_value='example2', status=None)])
-        self.assertEqual(_structuring_input_flags(command, input_flags).input_flags, InputFlags([InputFlag('ssh', input_value='example2', status=ValidationStatus.INVALID)]))

-    def test_structuring_input_flags7(self):
-        command = Command('cmd', flags=Flag('port'))
-        input_flags = InputFlags([InputFlag('port', input_value='some2', status=None)])
-        self.assertEqual(_structuring_input_flags(command, input_flags).input_flags, InputFlags([InputFlag('port', input_value='some2', status=ValidationStatus.VALID)]))
+def test_validate_func_args_raises_error_for_missing_response_parameter() -> None:
+    def handler() -> None:
+        pass
+    with pytest.raises(RequiredArgumentNotPassedException):
+        _validate_func_args(handler)  # pyright: ignore[reportArgumentType]

-    def test_structuring_input_flags8(self):
-        command = Command('cmd', flags=Flag('port', possible_values=['some2', 'some3']))
-        input_flags = InputFlags([InputFlag('port', input_value='some2', status=None)])
-        self.assertEqual(_structuring_input_flags(command, input_flags).input_flags, InputFlags([InputFlag('port', input_value='some2', status=ValidationStatus.VALID)]))

-    def test_structuring_input_flags9(self):
-        command = Command('cmd', flags=Flag('ssh', possible_values=re.compile(r'more[1-5]$')))
-        input_flags = InputFlags([InputFlag('ssh', input_value='more5', status=None)])
-        self.assertEqual(_structuring_input_flags(command, input_flags).input_flags, InputFlags([InputFlag('ssh', input_value='more5', status=ValidationStatus.VALID)]))
+def test_validate_func_args_prints_warning_for_wrong_type_hint(capsys: CaptureFixture[str]) -> None:
+    class NotResponse:
+        pass

-    def test_structuring_input_flags10(self):
-        command = Command('cmd', flags=Flag('ssh', possible_values=PossibleValues.NEITHER))
-        input_flags = InputFlags([InputFlag('ssh', input_value=None, status=None)])
-        self.assertEqual(_structuring_input_flags(command, input_flags).input_flags, InputFlags([InputFlag('ssh', input_value=None, status=ValidationStatus.VALID)]))
+    def func(_response: NotResponse) -> None:
+        pass

-    def test_validate_incorrect_func_args1(self):
-        def handler():
-            pass
-        with self.assertRaises(RequiredArgumentNotPassedException):
-            _validate_func_args(handler) # pyright: ignore[reportArgumentType]
+    _validate_func_args(func)

-    def test_get_router_aliases(self):
-        router = Router()
-        @router.command(Command('some', aliases=['test', 'case']))
-        def handler(response: Response) -> None: # pyright: ignore[reportUnusedFunction]
-            pass
-        self.assertListEqual(router.aliases, ['test', 'case'])
+    output = capsys.readouterr()

-    def test_get_router_aliases2(self):
-        router = Router()
-        @router.command(Command('some', aliases=['test', 'case']))
-        def handler(response: Response): # pyright: ignore[reportUnusedFunction]
-            pass
-        @router.command(Command('ext', aliases=['more', 'foo']))
-        def handler2(response: Response): # pyright: ignore[reportUnusedFunction]
-            pass
-        self.assertListEqual(router.aliases, ['test', 'case', 'more', 'foo'])
+    assert "WARNING" in output.out

-    def test_get_router_aliases3(self):
-        router = Router()
-        @router.command(Command('some'))
-        def handler(response: Response): # pyright: ignore[reportUnusedFunction]
-            pass
-        self.assertListEqual(router.aliases, [])
+
+def test_validate_func_args_accepts_missing_type_hint(capsys: CaptureFixture[str]) -> None:
+    def func(response) -> None:  # pyright: ignore[reportMissingParameterType, reportUnknownParameterType]
+        pass
+    _validate_func_args(func)  # pyright: ignore[reportUnknownArgumentType]
+    output = capsys.readouterr()
+    assert output.out == ''
+
+
+# ============================================================================
+# Tests for input flag structuring - undefined flags
+# ============================================================================
+
+
+def test_structuring_input_flags_marks_unregistered_flag_as_undefined() -> None:
+    cmd = Command('cmd')
+    input_flags = InputFlags([InputFlag('ssh', input_value='', status=None)])
+    assert _structuring_input_flags(cmd, input_flags).input_flags == InputFlags([InputFlag('ssh', input_value='', status=ValidationStatus.UNDEFINED)])
+
+
+def test_structuring_input_flags_marks_unregistered_flag_with_value_as_undefined() -> None:
+    cmd = Command('cmd')
+    input_flags = InputFlags([InputFlag('ssh', input_value='some', status=None)])
+    assert _structuring_input_flags(cmd, input_flags).input_flags == InputFlags([InputFlag('ssh', input_value='some', status=ValidationStatus.UNDEFINED)])
+
+
+def test_structuring_input_flags_marks_flag_undefined_when_different_flag_registered() -> None:
+    cmd = Command('cmd', flags=Flag('port'))
+    input_flags = InputFlags([InputFlag('ssh', input_value='some2', status=None)])
+    assert _structuring_input_flags(cmd, input_flags).input_flags == InputFlags([InputFlag('ssh', input_value='some2', status=ValidationStatus.UNDEFINED)])
+
+
+# ============================================================================
+# Tests for input flag structuring - invalid flags
+# ============================================================================
+
+
+def test_structuring_input_flags_marks_flag_invalid_when_value_provided_for_neither() -> None:
+    command = Command('cmd', flags=Flag('ssh', possible_values=PossibleValues.NEITHER))
+    input_flags = InputFlags([InputFlag('ssh', input_value='some3', status=None)])
+    assert _structuring_input_flags(command, input_flags).input_flags == InputFlags([InputFlag('ssh', input_value='some3', status=ValidationStatus.INVALID)])
+
+
+def test_structuring_input_flags_marks_flag_invalid_when_value_not_matching_regex() -> None:
+    command = Command('cmd', flags=Flag('ssh', possible_values=re.compile(r'some[1-5]$')))
+    input_flags = InputFlags([InputFlag('ssh', input_value='some40', status=None)])
+    assert _structuring_input_flags(command, input_flags).input_flags == InputFlags([InputFlag('ssh', input_value='some40', status=ValidationStatus.INVALID)])
+
+
+def test_structuring_input_flags_marks_flag_invalid_when_value_not_in_list() -> None:
+    command = Command('cmd', flags=Flag('ssh', possible_values=['example']))
+    input_flags = InputFlags([InputFlag('ssh', input_value='example2', status=None)])
+    assert _structuring_input_flags(command, input_flags).input_flags == InputFlags([InputFlag('ssh', input_value='example2', status=ValidationStatus.INVALID)])
+
+
+# ============================================================================
+# Tests for input flag structuring - valid flags
+# ============================================================================
+
+
+def test_structuring_input_flags_marks_registered_flag_as_valid() -> None:
+    command = Command('cmd', flags=Flag('port'))
+    input_flags = InputFlags([InputFlag('port', input_value='some2', status=None)])
+    assert _structuring_input_flags(command, input_flags).input_flags == InputFlags([InputFlag('port', input_value='some2', status=ValidationStatus.VALID)])
+
+
+def test_structuring_input_flags_marks_flag_valid_when_value_in_list() -> None:
+    command = Command('cmd', flags=Flag('port', possible_values=['some2', 'some3']))
+    input_flags = InputFlags([InputFlag('port', input_value='some2', status=None)])
+    assert _structuring_input_flags(command, input_flags).input_flags == InputFlags([InputFlag('port', input_value='some2', status=ValidationStatus.VALID)])
+
+
+def test_structuring_input_flags_marks_flag_valid_when_value_matches_regex() -> None:
+    command = Command('cmd', flags=Flag('ssh', possible_values=re.compile(r'more[1-5]$')))
+    input_flags = InputFlags([InputFlag('ssh', input_value='more5', status=None)])
+    assert _structuring_input_flags(command, input_flags).input_flags == InputFlags([InputFlag('ssh', input_value='more5', status=ValidationStatus.VALID)])
+
+
+def test_structuring_input_flags_marks_flag_valid_when_empty_value_for_neither() -> None:
+    command = Command('cmd', flags=Flag('ssh', possible_values=PossibleValues.NEITHER))
+    input_flags = InputFlags([InputFlag('ssh', input_value='', status=None)])
+    assert _structuring_input_flags(command, input_flags).input_flags == InputFlags([InputFlag('ssh', input_value='', status=ValidationStatus.VALID)])
+
+
+# ============================================================================
+# Tests for router aliases
+# ============================================================================
+
+
+def test_router_aliases_returns_command_aliases() -> None:
+    router = Router()
+    @router.command(Command('some', aliases={'test', 'case'}))
+    def handler(_response: Response) -> None:
+        pass
+    assert router.aliases == {'test', 'case'}
+
+
+def test_router_aliases_returns_combined_aliases_from_multiple_commands() -> None:
+    router = Router()
+    @router.command(Command('some', aliases={'test', 'case'}))
+    def handler(_response: Response) -> None:
+        pass
+    @router.command(Command('ext', aliases={'more', 'foo'}))
+    def handler2(_response: Response) -> None:
+        pass
+    assert router.aliases == {'test', 'case', 'more', 'foo'}
+
+
+def test_router_aliases_returns_empty_set_when_no_aliases() -> None:
+    router = Router()
+    @router.command(Command('some'))
+    def handler(_response: Response) -> None:
+        pass
+    assert router.aliases == set()
+
+
+# ============================================================================
+# Tests for handler finding and execution
+# ============================================================================
+
+
+def test_finds_appropriate_handler_executes_handler_by_alias(capsys: CaptureFixture[str]) -> None:
+    router = Router()
+
+    @router.command(Command('hello', aliases={'hi'}))
+    def handler(_res: Response) -> None:
+        print("Hello World!")
+
+    router.finds_appropriate_handler(InputCommand('hi'))
+
+    output = capsys.readouterr()
+
+    assert "Hello World!" in output.out
+
+
+def test_finds_appropriate_handler_executes_handler_with_flags_by_alias(capsys: CaptureFixture[str]) -> None:
+    router = Router()
+
+    @router.command(Command('hello', flags=Flag('flag'), aliases={'hi'}))
+    def handler(_res: Response) -> None:
+        print("Hello World!")
+
+    router.finds_appropriate_handler(InputCommand('hi'))
+
+    output = capsys.readouterr()
+
+    assert "Hello World!" in output.out