}

    @Override
    public boolean isEmpty() {
        return instrumentedSuperTypes.get().isEmpty();
    }

    public Optional<HashCode> getInstrumentedTypesHash() {
        return instrumentedHashCode.get();
    }

    public Optional<HashCode> getUpgradedPropertiesHash() {
        return upgradedPropertiesHashCode.get();
    }

        Hasher hasher = Hashing.defaultFunction().newHasher();
        hasher.putInt(CACHE_FORMAT);
        hasher.putInt(AsmConstants.MAX_SUPPORTED_JAVA_VERSION);
        gradleCoreInstrumentationTypeRegistry.getInstrumentedTypesHash().ifPresent(hasher::putHash);
        gradleCoreInstrumentationTypeRegistry.getUpgradedPropertiesHash().ifPresent(hasher::putHash);
        classpathElementTransformFactory.applyConfigurationTo(hasher);

    def classpathWalker = new ClasspathWalker(TestFiles.fileSystem())
    def gradleCoreInstrumentingRegistry = Stub(GradleCoreInstrumentationTypeRegistry) {
        getInstrumentedTypesHash() >> Optional.empty()
        getUpgradedPropertiesHash() >> Optional.empty()
    }

    def "instrumentation for #factory preserves classes"() {
        given:

        isAgentInstrumentationEnabled() >> false
    }
    def gradleCoreInstrumenting = Stub(GradleCoreInstrumentationTypeRegistry) {
        getInstrumentedTypesHash() >> Optional.empty()
        getUpgradedPropertiesHash() >> Optional.empty()
    }
    def classpathFingerprinter = Stub(ClasspathFingerprinter) {