.createTestSuite());

    suite.addTest(testsForFilter());
    suite.addTest(testsForFilterNoNulls());
    suite.addTest(testsForFilterFiltered());

    return suite;
  }

  @J2ktIncompatible
  @GwtIncompatible // suite
  private static Test testsForFilter() {
    return SetTestSuiteBuilder.using(
            new TestStringSetGenerator() {