def METHOD_NAME(self):
    """
    Test :func:`colour.models.ragoo2021.XYZ_to_IPT_Ragoo2021` definition
    nan support.
    """
    cases = [-1.0, 0.0, 1.0, -np.inf, np.inf, np.nan]
    cases = np.array(list(set(product(cases, repeat=3))))
    XYZ_to_IPT_Ragoo2021(cases)