* overkill when nearly all Streams are produced using well-tested JDK calls. So, we cheat and
   * just test that the toArray() contents are as expected.
   */
  public void testStream_nonCollection() {
    assertThat(stream(FluentIterable.of())).isEmpty();
    assertThat(stream(FluentIterable.of("a"))).containsExactly("a");
    assertThat(stream(FluentIterable.of(1, 2, 3)).filter(n -> n > 1)).containsExactly(2, 3);