List<Integer> list5 = newArrayList(10);
    FluentIterable<Integer> result = FluentIterable.concat(list1, list2, list3, list4, list5);
    assertEquals(asList(1, 4, 7, 8, 9, 10), newArrayList(result));
    assertThat(result.toString()).isEqualTo("[1, 4, 7, 8, 9, 10]");
  }

  public void testConcatNullPointerException() {
    List<Integer> list1 = newArrayList(1);
    List<Integer> list2 = newArrayList(4);

    List<Integer> list5 = newArrayList(10);
    Iterable<Integer> result = Iterables.concat(list1, list2, list3, list4, list5);
    assertEquals(asList(1, 4, 7, 8, 9, 10), newArrayList(result));
    assertThat(result.toString()).isEqualTo("[1, 4, 7, 8, 9, 10]");
  }

  public void testConcatNullPointerException() {
    List<Integer> list1 = newArrayList(1);
    List<Integer> list2 = newArrayList(4);

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