def METHOD_NAME(self) -> None:
    self.merger.merge(self.data)
    self.merger.merge(self.config)
    self.merger.merge(Style({"title": {"backgroundColor": "#A0A0A0"}}))
    self.assertEqual(
        json.dumps(
            {
                "data": {"records": [["Rock", "Hard", 96]]},
                "config": {"channels": {"label": {"attach": ["Popularity"]}}},
                "style": {"title": {"backgroundColor": "#A0A0A0"}},
            }
        ),
        self.merger.dump(),
    )