MapFeature.ALLOWS_ANY_NULL_QUERIES,
                CollectionFeature.SERIALIZABLE)
            .createTestSuite());

    return suite;
  }

  public void testSerialization_empty() {
    assertSame(
        ImmutableClassToInstanceMap.of(),
        SerializableTester.reserialize(ImmutableClassToInstanceMap.of()));
  }

  public void testCopyOf_map_empty() {