assertThat(expected).hasMessageThat().isEqualTo("expected one element but was: <foo, bar>");
  }

  @GwtIncompatible // Iterators.toArray(Iterator, Class)
  public void testToArrayEmpty() {
    Iterator<String> iterator = Collections.<String>emptyList().iterator();
    String[] array = Iterators.toArray(iterator, String.class);
    assertThat(array).isEmpty();
  }