protected Collection<Method> suppressForConcurrentHashMap() {
    return emptySet();
  }

  protected Collection<Method> suppressForConcurrentSkipListMap() {
    return asList(
        MapEntrySetTester.getSetValueMethod(),
        MapEntrySetTester.getSetValueWithNullValuesAbsentMethod(),
        MapEntrySetTester.getSetValueWithNullValuesPresentMethod(),
        MapEntrySetTester.getIteratorSetValueAndRemove());
  }