    def test_stop_frame(self):
        """
        Check Frames always request no end to the Scene.
        """
        screen = MagicMock(spec=Screen, colours=8, unicode_aware=False)
        canvas = Canvas(screen, 10, 40, 0, 0)
        form = _TestFrame(canvas, reduce_cpu=True)
        self.assertEqual(form.stop_frame, -1)
Check Frames always request no end to the Scene.
tests/test_widgets.py