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));
    assertEquals("[1, 4, 7, 8, 9, 10]", result.toString());
  }

  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));
    assertEquals("[1, 4, 7, 8, 9, 10]", result.toString());
  }

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

-list>li>a:hover,.users-list>li>a:hover .users-list-name{color:#999}.users-list-date,.users-list-name{display:block}.users-list-name{color:#495057;font-size:.875rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.users-list-date{color:#748290;font-size:12px}.dark-mode .users-list-name{color:#ced4da}.dark-mode .users-list-date{color:#adb5bd}.card-widget{border:0;position:relative}.widget-user .widget-user-header{border-top-left-radius:.25rem;border-top-right-radius:.25rem;height:135px;...

color: #999;\n}\n\n.users-list-name,\n.users-list-date {\n  display: block;\n}\n\n.users-list-name {\n  color: #495057;\n  font-size: 0.875rem;\n  overflow: hidden;\n  text-overflow: ellipsis;\n  white-space: nowrap;\n}\n\n.users-list-date {\n  color: #748290;\n  font-size: 12px;\n}\n\n.dark-mode .users-list-name {\n  color: #ced4da;\n}\n\n.dark-mode .users-list-date {\n  color: #adb5bd;\n}\n\n.card-widget {\n  border: 0;\n  position: relative;\n}\n\n.widget-user .widget-user-header {\n  border-top-left-radius:...