DisposableUtil.add(new TestDisposable("b"));
        assertThat(DisposableUtil.disposables.size(), is(2));
        DisposableUtil.dispose();
        assertThat(count, is(2));
        assertThat(names, is("ba"));
        assertThat(DisposableUtil.disposables.size(), is(0));
    }

    /**
     * @throws Exception
     */
    @Test
    public void test3() throws Exception {

    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");
  }

        verifyNfold(192, "MASSACHVSETTS INSTITVTE OF TECHNOLOGY", "db3b0d8f0b061e603282b308a50841229ad798fab9540c1b");
        verifyNfold(168, "Q", "518a54a215a8452a518a54a215a8452a518a54a215");
        verifyNfold(168, "ba", "fb25d531ae8974499f52fd92ea9857c4ba24cf297e");

        verifyNfold(64, "kerberos", "6b65726265726f73");
        verifyNfold(128, "kerberos", "6b65726265726f737b9b5b2b93132b93");

    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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