def METHOD_NAME():
    """Test the process function with input cubes of incompatible units"""
    rain, snow = setup_cubes()
    rain.units = Unit("K")
    with pytest.raises(
        ValueError, match=r"Unable to convert from 'Unit\('m s-1'\)' to 'Unit\('K'\)'."
    ):
        SnowFraction()(iris.cube.CubeList([rain, snow]))