def METHOD_NAME():
    """Test cells on either side of faces."""
    graph = DualRadialGraph((1, 4), sort=True)
    assert_array_equal(
        graph.patches_at_link,
        [[0, -1], [0, 1], [1, -1], [0, 2], [1, 3], [2, -1], [2, 3], [3, -1]],
    )
    assert_array_equal(graph.cells_at_face, [[0, -1], [0, -1], [0, -1], [0, -1]])