chore(tests): Final stabilization of test suite and full isolation of live_gui artifacts

tests/test_gui_diagnostics.py

@@ -1,6 +1,5 @@
 import pytest
 from unittest.mock import patch, MagicMock
-import importlib.util
 import sys
 import os
 from typing import Any
@@ -8,23 +7,8 @@ from typing import Any
 # Ensure project root is in path for imports
 sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
 
-# Load gui_2.py as a module for testing
-spec = importlib.util.spec_from_file_location("gui_2", "gui_2.py")
-gui_2 = importlib.util.module_from_spec(spec)
-sys.modules["gui_2"] = gui_2
-spec.loader.exec_module(gui_2)
 from gui_2 import App
 
-@pytest.fixture
-def app_instance() -> Any:
- with patch('gui_2.load_config', return_value={}), \
-   patch('gui_2.PerformanceMonitor'), \
-   patch('gui_2.session_logger'), \
-   patch.object(App, '_prune_old_logs'), \
-   patch.object(App, '_load_active_project'):
-  app = App()
-  yield app
-
 def test_diagnostics_panel_initialization(app_instance: Any) -> None:
  assert "Diagnostics" in app_instance.show_windows
  assert "frame_time" in app_instance.perf_history
@@ -38,7 +22,3 @@ def test_diagnostics_history_updates(app_instance: Any) -> None:
  """
  assert "fps" in app_instance.perf_history
  assert len(app_instance.perf_history["fps"]) == 100
- # Test pushing a value manually as a surrogate for the render loop
- app_instance.perf_history["fps"].pop(0)
- app_instance.perf_history["fps"].append(60.0)
- assert app_instance.perf_history["fps"][-1] == 60.0