public void testGetNext_withDefault_singleton() {
    Iterator<String> iterator = singletonList("foo").iterator();
    assertEquals("foo", Iterators.getNext(iterator, "bar"));
  }

  public void testGetNext_withDefault_empty() {
    Iterator<String> iterator = emptyIterator();
    assertEquals("bar", Iterators.getNext(iterator, "bar"));
  }

  public void testGetNext_withDefault_empty_null() {