Rework radar system

python_app/tests/gui_test_support.py

@@ -1,12 +1,20 @@
 """Construct desktop fixtures without touching a running application's resources."""
 
 from pathlib import Path
+from typing import TypeVar
+from PyQt6.QtWidgets import QWidget
+from python_app.gui.controllers.sections.views import SectionView
+
+_Widget = TypeVar("_Widget", bound=QWidget)
 import json
 import os
 import tempfile
 from unittest import mock
 
+from PyQt6.QtCore import QCoreApplication, QEvent
+
 from python_app.gui.app_window import AppWindow
+from python_app.gui.controllers.web_controller import WebBridge
 
 
 def isolated_window(add_cleanup) -> AppWindow:
@@ -24,6 +32,21 @@ def isolated_window(add_cleanup) -> AppWindow:
     with mock.patch.dict(os.environ, {
         "RADAR_SYSTEM_PROFILE": str(profile), "RADAR_SYSTEM_AUTO_START": "0",
         "RADAR_SYSTEM_AUTO_APPLY_RADAR": "0",
-    }), mock.patch.object(AppWindow, "_init_web_ui"):
+    }), mock.patch.object(WebBridge, "start_server"):
         window = AppWindow(root)
+
+    def destroy_window() -> None:
+        window.close()
+        # Close stops services; Qt must destroy the widget tree before Python GC
+        # can collect the controller callbacks and their graphics objects.
+        window.deleteLater()
+        QCoreApplication.sendPostedEvents(window, QEvent.Type.DeferredDelete)
+
+    add_cleanup(destroy_window)
     return window
+
+
+def widget(view: SectionView, name: str, kind: type[_Widget]) -> _Widget:
+    value = view.fields[name]
+    assert isinstance(value, kind), name
+    return value