assertThat(requirements.getPresentFeatures()).isEmpty();
    assertThat(requirements.getAbsentFeatures()).isEmpty();
  }

  public void testBuildTesterRequirements_class_empty() throws Exception {
    @Require
    class Tester {}

    TesterRequirements requirements = buildTesterRequirements(Tester.class);

    assertThat(requirements.getPresentFeatures()).isEmpty();

  }

  public TesterRequirements(TesterRequirements tr) {
    this(tr.getPresentFeatures(), tr.getAbsentFeatures());
  }

  public TesterRequirements() {
    this(Collections.<Feature<?>>emptySet(), Collections.<Feature<?>>emptySet());
  }

  public final Set<Feature<?>> getPresentFeatures() {
    return presentFeatures;
  }

  public final Set<Feature<?>> getAbsentFeatures() {

    } catch (ConflictingRequirementsException e) {
      throw new RuntimeException(e);
    }
    if (!features.containsAll(requirements.getPresentFeatures())) {
      if (logger.isLoggable(FINER)) {
        Set<Feature<?>> missingFeatures = copyToSet(requirements.getPresentFeatures());
        missingFeatures.removeAll(features);
        logger.finer(
            Platform.format(

      throws ConflictingRequirementsException {
    Set<Feature<?>> presentFeatures = requirements.getPresentFeatures();
    Set<Feature<?>> absentFeatures = requirements.getAbsentFeatures();
    Set<Feature<?>> morePresentFeatures = moreRequirements.getPresentFeatures();
    Set<Feature<?>> moreAbsentFeatures = moreRequirements.getAbsentFeatures();

      throws ConflictingRequirementsException {
    Set<Feature<?>> presentFeatures = requirements.getPresentFeatures();
    Set<Feature<?>> absentFeatures = requirements.getAbsentFeatures();
    Set<Feature<?>> morePresentFeatures = moreRequirements.getPresentFeatures();
    Set<Feature<?>> moreAbsentFeatures = moreRequirements.getAbsentFeatures();