Iterable<Character> result = Traverser.forGraph(graph).breadthFirst('h');

    assertEqualCharNodes(Iterables.limit(result, 2), "hd");
    assertThat(graph.requestedNodes).containsExactly('h', 'h', 'd');

    // Iterate again to see if calculation is done again
    assertEqualCharNodes(Iterables.limit(result, 2), "hd");
    assertThat(graph.requestedNodes).containsExactly('h', 'h', 'h', 'd', 'd');
  }

  @Test

    Iterable<Character> result = Traverser.forGraph(graph).breadthFirst('h');

    assertEqualCharNodes(Iterables.limit(result, 2), "hd");
    assertThat(graph.requestedNodes).containsExactly('h', 'h', 'd');

    // Iterate again to see if calculation is done again
    assertEqualCharNodes(Iterables.limit(result, 2), "hd");
    assertThat(graph.requestedNodes).containsExactly('h', 'h', 'h', 'd', 'd');
  }

  @Test

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