allowsNullValues,
          supportsPut,
          supportsRemove,
          supportsClear,
          supportsIteratorRemove);
    }

    @Override
    protected String getKeyNotInPopulatedMap() {
      return "four";
    }

    @Override
    protected Integer getValueNotInPopulatedMap() {
      return 4;
    }
  }

  abstract static class RowTests extends MapTests {

    underlying.put("c", 3);
    return transformValues(
        new UnmodifiableIteratorMap<String, Integer>(underlying), Functions.toStringFunction());
  }

  @Override
  protected String getKeyNotInPopulatedMap() throws UnsupportedOperationException {
    return "z";
  }

  @Override
  protected String getValueNotInPopulatedMap() throws UnsupportedOperationException {
    return "26";
  }