def METHOD_NAME(cls):
    """What happens if we use an un-supported keyword?"""
    mdl = cls()
    mdl._use_caching = False
    if cls == models.LineBroad:
        mdl.vsini = 1e6
    # Not guaranteed to produce interesting results
    x = [10, 12, 13, 15]
    y1 = mdl(x)
    y2 = mdl(x, not_an_argument=True)
    assert y2 == pytest.approx(y1)