def METHOD_NAME(self) -> None:
    self.merger.merge(Keyframe(Style(None)))
    self.merger.merge(Keyframe(Style(None), duration=0))
    self.merger.merge(Keyframe(Style(None)))
    self.assertEqual(
        self.merger.dump(),
        json.dumps(
            [
                {"target": {"style": None}},
                {"target": {"style": None}, "options": {"duration": 0}},
                {"target": {"style": None}},
            ]
        ),
    )