}

          @Override
          public Collection<Boolean> values() {
            return new StandardValues();
          }
        };
    callAllPublicMethods(new TypeToken<Collection<Boolean>>() {}, forward.values());

    // These are the methods specified by StandardValues
    verify(map, atLeast(0)).clear();
    verify(map, atLeast(0)).containsValue(any());
    verify(map, atLeast(0)).isEmpty();