diff --git a/argenta/app/entity.py b/argenta/app/entity.py
index b9c5e98..a43dbb6 100644
--- a/argenta/app/entity.py
+++ b/argenta/app/entity.py
@@ -50,7 +50,7 @@ class App:
         self._invalid_input_flags_handler: Callable[[str], None] = lambda raw_command: print_func(f'Incorrect flag syntax: "{raw_command}"')
         self._repeated_input_flags_handler: Callable[[str], None] = lambda raw_command: print_func(f'Repeated input flags: "{raw_command}"')
         self._empty_input_command_handler: Callable[[], None] = lambda: print_func(f'Empty input command')
-        self._unknown_command_handler: Callable[[Command], None] = lambda command: print_func(f"Unknown command: {command.get_string_entity()}")
+        self._unknown_command_handler: Callable[[Command], None] = lambda command: print_func(f"Unknown command: {command.get_trigger()}")
 
 
     def start_polling(self) -> None:
@@ -100,7 +100,9 @@ class App:
                     self.print_func(self.prompt)
                 continue
 
-            self._check_command_for_exit_command(input_command.get_trigger())
+            is_exit = self._is_exit_command(input_command.get_trigger())
+            if is_exit:
+                return
 
             self.print_func(self.line_separate)
             is_unknown_command: bool = self._check_is_command_unknown(input_command)
@@ -212,15 +214,16 @@ class App:
                         raise RepeatedCommandInDifferentRoutersException()
 
 
-    def _check_command_for_exit_command(self, command: str):
+    def _is_exit_command(self, command: str):
         if command.lower() == self.exit_command.lower():
             if self.ignore_exit_command_register:
                 self.print_func(self.farewell_message)
-                exit(0)
+                return True
             else:
                 if command == self.exit_command:
                     self.print_func(self.farewell_message)
-                    exit(0)
+                    return True
+        return False
 
 
     def _check_is_command_unknown(self, command: Command):
diff --git a/argenta/command/flag/entity.py b/argenta/command/flag/entity.py
index d59e824..bd598a0 100644
--- a/argenta/command/flag/entity.py
+++ b/argenta/command/flag/entity.py
@@ -28,8 +28,8 @@ class Flag:
         self._flag_value = value
 
     def validate_input_flag_value(self, input_flag_value: str | None):
-        if input_flag_value is None:
-            if self.possible_flag_values is False:
+        if self.possible_flag_values is False:
+            if input_flag_value is None:
                 return True
             else:
                 return False
diff --git a/mock/local_test.py b/mock/local_test.py
index 3f2b16e..a648f2f 100644
--- a/mock/local_test.py
+++ b/mock/local_test.py
@@ -1,3 +1,38 @@
-from typing import cast, Literal
+import _io
+from io import StringIO
+from unittest.mock import patch, MagicMock
+import io
+from argenta.app import App
+from argenta.command import Command
+from argenta.router import Router
+
+
+def run_shell():
+    router = Router()
+
+    @router.command(Command('test'))
+    def test():
+        print('loh ibanu')
+
+    app = App()
+    app.include_router(router)
+
+    app.start_polling()
+
+
+@patch("builtins.input", side_effect=["test", "q"])
+@patch("sys.stdout", new_callable=io.StringIO)
+def test_run_shell_output(mock_stdout: _io.StringIO, magick_mock: MagicMock):
+    run_shell()
+    output = mock_stdout.getvalue()
+
+    assert "loh ibanu" in output
+    return magick_mock
+
+
+res = test_run_shell_output()
+print(res)
+print(type(res))
+
+print("✅ Тест вывода пройден!")
 
-print(cast(Literal['-', '--', '---'], '----'))
\ No newline at end of file
diff --git a/tests/system_tests/__init__.py b/tests/system_tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/system_tests/test_system.py b/tests/system_tests/test_system.py
new file mode 100644
index 0000000..2e9a859
--- /dev/null
+++ b/tests/system_tests/test_system.py
@@ -0,0 +1,30 @@
+import _io
+from unittest.mock import patch, MagicMock
+import unittest
+import io
+
+from argenta.app import App
+from argenta.command import Command
+from argenta.router import Router
+
+
+
+class TestSystem(unittest.TestCase):
+    @patch("builtins.input", side_effect=["test", "q"])
+    @patch("sys.stdout", new_callable=io.StringIO)
+    def test_run_shell_output(self, mock_stdout: _io.StringIO, magick_mock: MagicMock):
+        router = Router()
+
+        @router.command(Command('test'))
+        def test():
+            print('test command')
+
+        app = App()
+        app.include_router(router)
+        app.start_polling()
+
+        output = mock_stdout.getvalue()
+
+        self.assertIn('test command', output)
+
+
diff --git a/tests/unit_tests/__init__.py b/tests/unit_tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_app.py b/tests/unit_tests/test_app.py
similarity index 100%
rename from tests/test_app.py
rename to tests/unit_tests/test_app.py
diff --git a/tests/test_command.py b/tests/unit_tests/test_command.py
similarity index 100%
rename from tests/test_command.py
rename to tests/unit_tests/test_command.py
diff --git a/tests/test_flag.py b/tests/unit_tests/test_flag.py
similarity index 100%
rename from tests/test_flag.py
rename to tests/unit_tests/test_flag.py
diff --git a/tests/test_flagsgroup.py b/tests/unit_tests/test_flagsgroup.py
similarity index 100%
rename from tests/test_flagsgroup.py
rename to tests/unit_tests/test_flagsgroup.py
diff --git a/tests/test_router.py b/tests/unit_tests/test_router.py
similarity index 100%
rename from tests/test_router.py
rename to tests/unit_tests/test_router.py