def METHOD_NAME(self):
    """
    Test :func:`colour.models.rgb.hanbury2003.RGB_to_IHLS` 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))))
    RGB_to_IHLS(cases)