EquivalenceTester.of(Equivalence.equals())
        .addEquivalenceGroup(new Integer(42_000_000), 42_000_000)
        .addEquivalenceGroup("a")
        .test();
  }

  public void testIdentityEquivalent() {
    EquivalenceTester.of(Equivalence.identity())
        .addEquivalenceGroup(new Integer(42_000_000))
        .addEquivalenceGroup(new Integer(42_000_000))
        .addEquivalenceGroup("a")
        .test();