def METHOD_NAME(self):
    stretch_1 = SqrtStretch() + SqrtStretch()
    stretch_2 = PowerStretch(0.25)
    stretch_3 = PowerStretch(4.0)
    np.testing.assert_allclose(stretch_1(DATA), stretch_2(DATA))
    np.testing.assert_allclose(stretch_1.inverse(DATA), stretch_3(DATA))