t.Error(err)
	}
	for _, feature := range features {
		if _, ok := mandatory[feature]; ok {
			mandatory[feature] = true
		}
		if flag, ok := mapping[feature]; ok {
			if !*flag {
				t.Errorf("feature '%v' not detected", feature)
			}
		} else {
			t.Logf("no entry for '%v'", feature)
		}
	}
	for k, v := range mandatory {
		if !v {
			t.Errorf("mandatory feature '%v' not detected", k)
		}
	}

        def fixture = new StaleOutputFixture(buildDir: 'build/outputs', overlappingOutputDir: overlappingOutputDir)
        fixture.createInputs()
        buildScript(fixture.buildScript)

        when:
        succeeds fixture.taskPath, fixture.taskWritingOverlappingOutputs

        then:
        fixture.taskCreatedOutputs()
        fixture.overlappingOutputsAreStillPresent()

        }
        fixture.none(LoadBuildBuildOperationType)
        fixture.none(LoadProjectsBuildOperationType)
        with(fixture.progress(BuildIdentifiedProgressDetails)) {
            size() == 1
            first().details.buildPath == ":"
        }
        with(fixture.progress(ProjectsIdentifiedProgressDetails)) {
            size() == 1
            with(first()) {

   * @return the implied set of features
   */
  public static Set<Feature<?>> impliedFeatures(Set<Feature<?>> features) {
    Set<Feature<?>> impliedSet = new LinkedHashSet<>();
    Queue<Feature<?>> queue = new ArrayDeque<>(features);
    while (!queue.isEmpty()) {
      Feature<?> feature = queue.remove();
      for (Feature<?> implied : feature.getImpliedFeatures()) {
        if (!features.contains(implied) && impliedSet.add(implied)) {

	// initialzation, it can flip the support at runtime.
	Supports(feature storage.Feature) bool
	// CheckClient works with etcd client to recalcualte feature support and cache it internally.
	// All etcd clients should support feature to cause `Supports` return true.
	// If client A supports and client B doesn't support the feature, the `Supports` will
	// first return true at client A initializtion and then return false on client B

        when:
        def feature = createFeature("feature")

        then:
        feature.name == "feature"
        feature.sourceSet == ext.sourceSets.getByName('feature')
        feature.runtimeClasspathConfiguration == project.configurations.getByName('featureRuntimeClasspath')
        feature.compileClasspathConfiguration == project.configurations.getByName('featureCompileClasspath')

        def fixture = scriptChangeSpec.fixtureForProjectDir(file('build-logic'), testDirectory)
        fixture.setup()
        def build = { configurationCacheRunLenient(*fixture.buildArguments) }
        settingsFile << """
            includeBuild 'build-logic'
        """

        when:
        build()

        then:
        outputContains fixture.expectedOutputBeforeChange

		{Name: "aesctr", Feature: &S390X.HasAESCTR},
		{Name: "aesgcm", Feature: &S390X.HasAESGCM},
		{Name: "ghash", Feature: &S390X.HasGHASH},
		{Name: "sha1", Feature: &S390X.HasSHA1},
		{Name: "sha256", Feature: &S390X.HasSHA256},
		{Name: "sha3", Feature: &S390X.HasSHA3},
		{Name: "sha512", Feature: &S390X.HasSHA512},
		{Name: "vx", Feature: &S390X.HasVX},
		{Name: "vxe", Feature: &S390X.HasVXE},
	}
}

# Feature Coverage Reporting

## Overview

The features package defines values that are used to track feature coverage at eng.istio.io

## Labeling a Test

    Set<Feature<?>> features = Sets.<Feature<?>>newHashSet(ExampleBaseFeature.BASE_FEATURE_1);
    assertSame(features, FeatureUtil.addImpliedFeatures(features));
  }

  public void testAddImpliedFeatures_addsImpliedFeatures() throws Exception {
    Set<Feature<?>> features;

    features = Sets.<Feature<?>>newHashSet(ExampleDerivedFeature.DERIVED_FEATURE_1);