def METHOD_NAME(self):
    """Test :func:`colour.models.oklab.Oklab_to_XYZ` definition."""
    np.testing.assert_allclose(
        Oklab_to_XYZ(np.array([0.51634019, 0.15469500, 0.06289579])),
        np.array([0.20654008, 0.12197225, 0.05136952]),
        rtol=0.000001,
        atol=0.000001,
    )
    np.testing.assert_allclose(
        Oklab_to_XYZ(np.array([0.59910746, -0.11139207, 0.07508465])),
        np.array([0.14222010, 0.23042768, 0.10495772]),
        rtol=0.000001,
        atol=0.000001,
    )
    np.testing.assert_allclose(
        Oklab_to_XYZ(np.array([1.00121561, 0.00899591, -0.00535107])),
        np.array([0.96907232, 1.00000000, 1.12179215]),
        rtol=0.000001,
        atol=0.000001,
    )