}

  private static boolean intersect(Set<?> a, Set<?> b) {
    return !disjoint(a, b);
  }

  private static Method extractMethod(Test test) {
    if (test instanceof AbstractTester) {
      AbstractTester<?> tester = (AbstractTester<?>) test;
      return getMethod(tester.getClass(), tester.getTestMethodName());
    } else if (test instanceof TestCase) {
      TestCase testCase = (TestCase) test;

  }

  private static boolean intersect(Set<?> a, Set<?> b) {
    return !disjoint(a, b);
  }

  private static Method extractMethod(Test test) {
    if (test instanceof AbstractTester) {
      AbstractTester<?> tester = (AbstractTester<?>) test;
      return getMethod(tester.getClass(), tester.getTestMethodName());
    } else if (test instanceof TestCase) {
      TestCase testCase = (TestCase) test;

      return emptySet();
    }
  }

  @SuppressWarnings("rawtypes") // class literals
  @Override
  protected List<Class<? extends AbstractTester>> getTesters() {
    List<Class<? extends AbstractTester>> testers = copyToList(super.getTesters());
    testers.add(CollectionSerializationEqualTester.class);
    testers.add(MultisetAddTester.class);
    testers.add(MultisetContainsTester.class);

      return emptySet();
    }
  }

  @SuppressWarnings("rawtypes") // class literals
  @Override
  protected List<Class<? extends AbstractTester>> getTesters() {
    List<Class<? extends AbstractTester>> testers = copyToList(super.getTesters());
    testers.add(CollectionSerializationEqualTester.class);
    testers.add(MultisetAddTester.class);
    testers.add(MultisetContainsTester.class);

      suite.addTest(subSuite);
    }
    return suite;
  }

  @SuppressWarnings("rawtypes") // class literals
  @Override
  protected List<Class<? extends AbstractTester>> getTesters() {
    List<Class<? extends AbstractTester>> testers = copyToList(super.getTesters());
    testers.add(MultisetNavigationTester.class);
    return testers;
  }

  @Override
  TestSuite createElementSetTestSuite(

    return new MapTestSuiteBuilder<K, V>().usingGenerator(generator);
  }

  @SuppressWarnings("rawtypes") // class literals
  @Override
  protected List<Class<? extends AbstractTester>> getTesters() {
    return Arrays.<Class<? extends AbstractTester>>asList(
        MapClearTester.class,
        MapContainsKeyTester.class,
        MapContainsValueTester.class,
        MapCreationTester.class,
        MapEntrySetTester.class,

  }

  // Class parameters must be raw.
  @SuppressWarnings("rawtypes") // class literals
  @Override
  protected List<Class<? extends AbstractTester>> getTesters() {
    return ImmutableList.<Class<? extends AbstractTester>>of(
        MultimapAsMapGetTester.class,
        MultimapAsMapTester.class,
        MultimapSizeTester.class,
        MultimapClearTester.class,