.addEqualityGroup(Optional.of(Long.valueOf(42)), reserialize(Optional.of(Long.valueOf(42))))
        .testEquals();
  }

  public void testToString_absent() {
    assertThat(Optional.absent().toString()).isEqualTo("Optional.absent()");
  }

  public void testToString_present() {
    assertThat(Optional.of("training").toString()).isEqualTo("Optional.of(training)");