def METHOD_NAME(self):
    """
    Test :func:`colour.difference.cam02_ucs.delta_E_Luo2006`
    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))))
    delta_E_Luo2006(cases, cases, COEFFICIENTS_UCS_LUO2006["CAM02-LCD"])