public void testPutAllEmptyCollectionOnAbsentKey() {
    assertFalse(multimap().putAll(k3(), Collections.<V>emptyList()));
    expectUnchanged();
  }

  @MapFeature.Require(SUPPORTS_PUT)
  public void testPutAllEmptyIterableOnAbsentKey() {
    Iterable<V> iterable =
        new Iterable<V>() {
          @Override
          public Iterator<V> iterator() {
            return ImmutableSet.<V>of().iterator();
          }
        };