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tests/test_lock_overlay.py

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+import pytest
+from PySide6.QtCore import QEvent
+from PySide6.QtWidgets import QWidget
+from bouquin.lock_overlay import LockOverlay
+
+
+@pytest.mark.gui
+def test_lock_overlay_reacts_to_theme(qtbot):
+    host = QWidget()
+    qtbot.addWidget(host)
+    host.show()
+
+    ol = LockOverlay(host, on_unlock=lambda: None)
+    qtbot.addWidget(ol)
+    ol.show()
+
+    ev = QEvent(QEvent.Type.PaletteChange)
+    ol.changeEvent(ev)