public void testEquals_abstractClass() {
    tester.testEquals(AnAbstractClass.class);
  }

  public void testEquals_enum() {
    tester.testEquals(OneConstantEnum.class);
  }

  public void testBadEquals() throws Exception {
    try {
      tester.testEquals(BadEquals.class);
    } catch (AssertionError expected) {
      assertThat(expected).hasMessageThat().contains("create(null)");
      return;
    }