suite.addTest(testsForHashMapNullKeysForbidden());
    suite.addTest(testsForHashMapNullValuesForbidden());
    suite.addTest(testsForSetUpTearDown());
    return suite;
  }

  private abstract static class WrappedHashMapGenerator extends TestStringMapGenerator {
    @Override
    protected final Map<String, String> create(Entry<String, String>[] entries) {
      HashMap<String, String> map = new HashMap<>();