String[] array = Iterables.toArray(iterable, String.class);
    assertThat(array).isEmpty();
  }

  @GwtIncompatible // Iterables.toArray(Iterable, Class)
  public void testToArraySingleton() {
    Iterable<String> iterable = singletonList("a");
    String[] array = Iterables.toArray(iterable, String.class);
    assertThat(array).isEqualTo(new String[] {"a"});
  }