def METHOD_NAME():
    """Test specific values give expected results"""
    data = np.zeros((2, 2), dtype=np.float32)
    data = np.ma.masked_array(data, [[True, False], [False, False]])
    input_cube = set_up_variable_cube(
        data, name="snow_fraction", units="1", standard_grid_metadata="uk_ens",
    )
    with pytest.raises(
        NotImplementedError, match="SignificantPhaseMask cannot handle masked data"
    ):
        SignificantPhaseMask()(input_cube, "snow")