}

  interface A {}

  interface B {}

  public void testEquals() {
    class AB implements A, B {}
    class BA implements B, A {}
    AB ab = new AB();
    BA ba = new BA();
    new EqualsTester()
        .addEqualityGroup(newDelegatingList(LIST1))
        // Actually, this violates List#equals contract.

  }

  interface A {}

  interface B {}

  public void testEquals() {
    class AB implements A, B {}
    class BA implements B, A {}
    AB ab = new AB();
    BA ba = new BA();
    new EqualsTester()
        .addEqualityGroup(newDelegatingList(LIST1))
        // Actually, this violates List#equals contract.

    Iterable<Character> result = Traverser.forGraph(TWO_TREES).depthFirstPostOrder('a');

    assertEqualCharNodes(result, "ba");
  }

  @Test
  public void forGraph_depthFirstPostOrderIterable_twoTrees() {
    assertEqualCharNodes(
        Traverser.forGraph(TWO_TREES).depthFirstPostOrder(charactersOf("a")), "ba");
    assertEqualCharNodes(
        Traverser.forGraph(TWO_TREES).depthFirstPostOrder(charactersOf("ac")), "badc");
  }

    Iterable<Character> result = Traverser.forGraph(TWO_TREES).depthFirstPostOrder('a');

    assertEqualCharNodes(result, "ba");
  }

  @Test
  public void forGraph_depthFirstPostOrderIterable_twoTrees() {
    assertEqualCharNodes(
        Traverser.forGraph(TWO_TREES).depthFirstPostOrder(charactersOf("a")), "ba");
    assertEqualCharNodes(
        Traverser.forGraph(TWO_TREES).depthFirstPostOrder(charactersOf("ac")), "badc");
  }

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