Traverser<Character> traverser = Traverser.forTree(CYCLIC_GRAPH_CONTAINING_TREE);

    assertEqualCharNodes(traverser.depthFirstPostOrder('a'), "cdba");
    assertEqualCharNodes(traverser.depthFirstPostOrder('b'), "cdb");
    assertEqualCharNodes(traverser.depthFirstPostOrder('d'), "d");
  }

  @Test
  public void forTree_depthFirstPostOrderIterable_cyclicGraphContainingTree() throws Exception {

    Traverser<Character> traverser = Traverser.forTree(CYCLIC_GRAPH_CONTAINING_TREE);

    assertEqualCharNodes(traverser.depthFirstPostOrder('a'), "cdba");
    assertEqualCharNodes(traverser.depthFirstPostOrder('b'), "cdb");
    assertEqualCharNodes(traverser.depthFirstPostOrder('d'), "d");
  }

  @Test
  public void forTree_depthFirstPostOrderIterable_cyclicGraphContainingTree() throws Exception {

                "93fee46b-2715-4abd-877a-4197eb8601aa",
                "0379da36-84ee-4d06-9388-83d3aa6536b5",
                "4bb2c7a8-cf68-4ca5-8024-72dc93506da9",
                "9dcc4cd1-34d2-4499-8dab-3ef8bca9680d",
                "ea53d552-83ab-4f7d-852d-98951201083d",
                "0bc420d2-4089-468b-bc54-0a4e2835feed",
                "318d2433-fe40-4f28-9f3a-4e3d66d9b5fb",

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