feat(tests): ship widget test fixtures importable by plugin repositories

tests/unit_tests/test_testing_utils.py

@@ -1,5 +1,7 @@
+import sys
 from unittest.mock import MagicMock
 
+from bec_widgets.tests.testable_qtimer import TestableQTimer
 from bec_widgets.widgets.services.bec_status_box.bec_status_box import BECServiceStatusMixin
 
 
@@ -8,3 +10,16 @@ def test_qtimer_uses_testable_qtimer():
     assert service_status._service_update_timer.__class__.__name__ != "QTimer"
     assert service_status._service_update_timer.__class__.__name__ == "TestableQTimer"
     service_status.cleanup()
+
+
+def test_no_module_binds_the_unpatched_qtimer():
+    """bec_widgets.tests.fixtures must patch QTimer before anything imports it by name."""
+    unpatched_qtimer = TestableQTimer.__bases__[0]
+    bound = [
+        name
+        for name, module in list(sys.modules.items())
+        if name.startswith(("bec_widgets", "bec_qthemes"))
+        and name != "bec_widgets.tests.testable_qtimer"
+        and getattr(module, "QTimer", None) is unpatched_qtimer
+    ]
+    assert bound == []