        desired_nodes = np.array([
            [4.0, 0.0, 0.0],
            [0.0, 4.0, 0.0],
            [0.0, 0.0, 0.0],
            [0.0, 0.0, 4.0],
            [2.0, 0.0, 2.0],
            [0.0, 2.0, 2.0],
            [0.0, 0.0, 2.0],
        ])
        np.testing.assert_almost_equal(