docs

docs/code_snippets/testing/app_integration_unittest.py

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+import io
+import unittest
+from contextlib import redirect_stdout
+
+from argenta import App, Router, Command, Response
+from argenta.command import InputCommand
+
+
+class TestAppIntegration(unittest.TestCase):
+    def setUp(self) -> None:
+        self.app = App(override_system_messages=True, repeat_command_groups=False)
+        self.router = Router(title="App")
+
+        @self.router.command(Command("HELP", description="Show help"))
+        def help_cmd(response: Response):
+            print("Available commands: HELP")
+        _ = help_cmd  # appease linter: function is registered via decorator
+
+        self.app.include_router(self.router)
+
+    def test_help_command(self):
+        with redirect_stdout(io.StringIO()) as stdout:
+            self.router.finds_appropriate_handler(InputCommand.parse("HELP"))
+        self.assertIn("Available commands:", stdout.getvalue())
+
+