def METHOD_NAME():
    """Raise if the axis is not unique"""
    df = pd.DataFrame({"a": [2, 4, 6], "b": [1, 3, 5], "c": [7, 8, 9]})
    df.columns = ["a", "b", "b"]
    with pytest.raises(AssertionError):
        df.move(source="a", axis=1)