def METHOD_NAME(self):
    """
    Test :func:`colour.appearance.nayatani95.XYZ_to_Nayatani95` 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_Nayatani95(
        cases, cases, cases[..., 0], cases[..., 0], cases[..., 0]
    )