entry.setValue("bbb");
    assertThat(transformed.entries()).containsExactly(immutableEntry("a", 3));
  }

  @GwtIncompatible // untested
  public void testTransformListValues() {
    ListMultimap<String, Integer> multimap =
        ImmutableListMultimap.of("a", 2, "b", -3, "b", 3, "a", 4, "c", 6);
    Function<Integer, Integer> square =
        new Function<Integer, Integer>() {