def test_style_transfer():
    r = visualization._transfer_style({"class": "dashed great"},
                                      {"class": "myclass"})
    assert r["class"] == "myclass dashed"
def test_style_transfer_empty():
    r = visualization._transfer_style({"class": "dashed great"},
                                      {"something": "else"})
    assert r["class"] == "dashed"