private void consistentValuesTest(Matcher<ValidationResult> matcher) {
   assertThat(validator.valuesConsistent(), matcher);
 }
 private void requiredValuesTest(Matcher<ValidationResult> matcher) {
   assertThat(validator.requiredValuesPresent(), matcher);
 }
 @Test
 public void nullQosValuesPresent() {
   assertThat(nullValidator.requiredValuesPresent(), isValid());
 }
 @Test
 public void nullQosValuesConsistent() {
   assertThat(nullValidator.valuesConsistent(), isValid());
 }