assertEquals(Optional.of("fallback"), Optional.absent().or(Optional.of("fallback")));
  }

  @SuppressWarnings("OptionalOfRedundantMethod") // Unit tests for Optional
  public void testOrNull_present() {
    assertThat(Optional.of("a").orNull()).isEqualTo("a");
  }

  public void testOrNull_absent() {
    assertThat(Optional.absent().orNull()).isNull();
  }

  public void testAsSet_present() {