* ConcurrentHashMap} support for {@code entrySet().add()}</a>.
   */
  @J2ktIncompatible
  @GwtIncompatible // reflection
  public static Method getAddAllUnsupportedNonePresentMethod() {
    return getMethod(CollectionAddAllTester.class, "testAddAll_unsupportedNonePresent");
  }

  /**
   * Returns the {@link Method} instance for {@link #testAddAll_unsupportedSomePresent()} so that