refactor(tests): Add strict type hints to fifth batch of test files

tests/conftest.py

@@ -5,6 +5,7 @@ import requests
 import os
 import signal
 import sys
+from typing import Generator
 import os
 
 # Ensure project root is in path
@@ -14,14 +15,14 @@ from api_hook_client import ApiHookClient
 import ai_client
 
 @pytest.fixture(autouse=True)
-def reset_ai_client() -> None:
+def reset_ai_client() -> Generator[None, None, None]:
  """Reset ai_client global state between every test to prevent state pollution."""
  ai_client.reset_session()
  # Default to a safe model
  ai_client.set_provider("gemini", "gemini-2.5-flash-lite")
  yield
 
-def kill_process_tree(pid):
+def kill_process_tree(pid: int | None) -> None:
  """Robustly kills a process and all its children."""
  if pid is None:
   return
@@ -41,7 +42,7 @@ def kill_process_tree(pid):
   print(f"[Fixture] Error killing process tree {pid}: {e}")
 
 @pytest.fixture(scope="session")
-def live_gui() -> None:
+def live_gui() -> Generator[tuple[subprocess.Popen, str], None, None]:
  """
     Session-scoped fixture that starts gui_2.py with --enable-test-hooks.
     """

tests/test_agent_tools_wiring.py

@@ -8,14 +8,11 @@ sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
 
 from ai_client import set_agent_tools, _build_anthropic_tools
 
-def test_set_agent_tools():
-# Correct usage: pass a dict
+def test_set_agent_tools() -> None:
  agent_tools = {"read_file": True, "list_directory": False}
  set_agent_tools(agent_tools)
 
-def test_build_anthropic_tools_conversion():
-# _build_anthropic_tools takes no arguments and uses the global _agent_tools
-# We set a tool to True and check if it appears in the output
+def test_build_anthropic_tools_conversion() -> None:
  set_agent_tools({"read_file": True})
  anthropic_tools = _build_anthropic_tools()
  tool_names = [t["name"] for t in anthropic_tools]

tests/test_gui2_events.py

@@ -1,11 +1,12 @@
 import pytest
 from unittest.mock import MagicMock, patch
+from typing import Generator
 from gui_2 import App
 import ai_client
 from events import EventEmitter
 
 @pytest.fixture
-def app_instance() -> None:
+def app_instance() -> Generator[type[App], None, None]:
  """
     Fixture to create an instance of the gui_2.App class for testing.
     It mocks functions that would render a window or block execution.
@@ -25,7 +26,7 @@ def app_instance() -> None:
  ):
   yield App
 
-def test_app_subscribes_to_events(app_instance):
+def test_app_subscribes_to_events(app_instance: type[App]) -> None:
  """
     This test checks that the App's __init__ method subscribes the necessary
     event handlers to the ai_client.events emitter.

tests/test_gui2_mcp.py

@@ -1,11 +1,12 @@
 import pytest
 from unittest.mock import patch, MagicMock
+from typing import Generator
 from gui_2 import App
 import ai_client
 from events import EventEmitter
 
 @pytest.fixture
-def app_instance() -> None:
+def app_instance() -> Generator[App, None, None]:
  if not hasattr(ai_client, 'events') or ai_client.events is None:
   ai_client.events = EventEmitter()
  with (
@@ -21,7 +22,7 @@ def app_instance() -> None:
  ):
   yield App()
 
-def test_mcp_tool_call_is_dispatched(app_instance):
+def test_mcp_tool_call_is_dispatched(app_instance: App) -> None:
  """
     This test verifies that when the AI returns a tool call for an MCP function,
     the ai_client correctly dispatches it to mcp_client.

tests/test_gui2_performance.py

@@ -11,7 +11,7 @@ from api_hook_client import ApiHookClient
 # Session-wide storage for comparing metrics across parameterized fixture runs
 _shared_metrics = {}
 
-def test_performance_benchmarking(live_gui):
+def test_performance_benchmarking(live_gui: tuple) -> None:
  """
     Collects performance metrics for the current GUI script (parameterized as gui.py and gui_2.py).
     """

tests/test_gui_async_events.py

@@ -5,7 +5,7 @@ from gui_2 import App
 from events import UserRequestEvent
 
 @pytest.fixture
-def mock_gui():
+def mock_gui() -> App:
  with (
   patch('gui_2.load_config', return_value={
     "ai": {"provider": "gemini", "model": "model-1"},
@@ -22,8 +22,7 @@ def mock_gui():
   gui = App()
   return gui
 
-def test_handle_generate_send_pushes_event(mock_gui):
-# Mock _do_generate to return sample data
+def test_handle_generate_send_pushes_event(mock_gui: App) -> None:
  mock_gui._do_generate = MagicMock(return_value=(
    "full_md", "path", [], "stable_md", "disc_text"
   ))

tests/test_gui_events.py

@@ -1,13 +1,14 @@
 
 import pytest
 from unittest.mock import MagicMock, patch
+from typing import Generator
 import dearpygui.dearpygui as dpg
 import gui_legacy
 from gui_legacy import App
 import ai_client
 
 @pytest.fixture
-def app_instance() -> None:
+def app_instance() -> Generator[App, None, None]:
  """
     Fixture to create an instance of the App class for testing.
     It creates a real DPG context but mocks functions that would
@@ -33,8 +34,7 @@ def app_instance() -> None:
   yield app
  dpg.destroy_context()
 
-def test_gui_updates_on_event(app_instance):
-# Patch dependencies for the test
+def test_gui_updates_on_event(app_instance: App) -> None:
  with patch('dearpygui.dearpygui.set_value') as mock_set_value, \
  patch('dearpygui.dearpygui.does_item_exist', return_value=True), \
  patch('dearpygui.dearpygui.configure_item'), \