expectThrows(disjoint);
    expectUnchanged();
  }

  // retainAll(superset)

  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testRetainAll_superset() {
    expectReturnsFalse(superset);
    expectUnchanged();
  }

  @CollectionFeature.Require(absent = SUPPORTS_REMOVE)
  public void testRetainAll_supersetUnsupported() {