def METHOD_NAME():
    """Test faces around corners."""
    y = [0, 1, 3, 0, 1, 3, 0, 1, 3]
    x = [3, 3, 3, 4, 4, 4, 6, 6, 6]
    graph = DualStructuredQuadGraph((y, x), shape=(3, 3))
    assert_array_equal(
        graph.faces_at_corner,
        [[0, 1, -1, -1], [-1, 2, 0, -1], [3, -1, -1, 1], [-1, -1, 3, 2]],
    )