public class OpenJdk6MapTests extends TestsForMapsInJavaUtil {
  public static Test suite() {
    return new OpenJdk6MapTests().allTests();
  }

  @Override
  protected Collection<Method> suppressForTreeMapNatural() {
    return asList(
        getPutNullKeyUnsupportedMethod(),
        getPutAllNullKeyUnsupportedMethod(),
        getCreateWithNullKeyUnsupportedMethod(),