originMetadataSerializer.write(encoder, execution.getOriginMetadata());

        hashCodeSerializer.write(encoder, execution.getCacheKey());
        implementationSnapshotSerializer.write(encoder, execution.getImplementation());
        ImmutableList<ImplementationSnapshot> additionalImplementations = execution.getAdditionalImplementations();
        encoder.writeSmallInt(additionalImplementations.size());

        Class<?> workType = workClass.get();
        TypeValidationContext workValidationContext = validationContext.forType(workType, true);
        validateImplementation(workValidationContext, beforeExecutionState.getImplementation(), "Implementation of ", work);
        beforeExecutionState.getAdditionalImplementations()

    def cacheKey = TestHashCodes.hashCodeFrom(1234)

    def originMetadata = Mock(OriginMetadata)
    def beforeExecutionState = Stub(BeforeExecutionState) {
        getImplementation() >> ImplementationSnapshot.of("Test", TestHashCodes.hashCodeFrom(123))
        getAdditionalImplementations() >> ImmutableList.of()
        getInputProperties() >> ImmutableSortedMap.of()

                    String parameterForImplementation = parameter.getImplementation();
                    if ((attributeForImplementation == null || attributeForImplementation.isEmpty())
                            && ((parameterForImplementation != null) && !parameterForImplementation.isEmpty())) {
                        attributes.put("implementation", parameter.getImplementation());
                    }

        vendorProperty.get() >> JvmVendorSpec.IBM

        JavaToolchainSpec spec = Mock(JavaToolchainSpec)
        spec.getLanguageVersion() >> javaLanguageVersionProperty
        spec.getImplementation() >> implementationProperty
        spec.getVendor() >> vendorProperty
        spec.getDisplayName() >> "mock spec"
        spec
    }

    private static String os() {

        Configuration annotationProcessor = configurations.getByName(sourceSet.getAnnotationProcessorConfigurationName());

        implementation.fromDependencyCollector(getDependencies().getImplementation());
        runtimeOnly.fromDependencyCollector(getDependencies().getRuntimeOnly());
        compileOnly.fromDependencyCollector(getDependencies().getCompileOnly());

            @Restricted
            public interface LibraryDependencies extends Dependencies {

                DependencyCollector getApi();

                DependencyCollector getImplementation();

                DependencyCollector getRuntimeOnly();

                DependencyCollector getCompileOnly();

             */
            @SuppressWarnings("UnstableApiUsage")
            @Restricted
            public interface ApplicationDependencies extends Dependencies {
                DependencyCollector getImplementation();
                DependencyCollector getRuntimeOnly();
                DependencyCollector getCompileOnly();
            }
        """

    }
    def previousState = Stub(PreviousExecutionState) {
        getInputProperties() >> ImmutableSortedMap.of()
        getInputFileProperties() >> ImmutableSortedMap.of()
        getImplementation() >> Stub(ClassImplementationSnapshot)

        getOutputFilesProducedByWork() >> ImmutableSortedMap.of()
    }

* Outside of Gradle build scripts, you must explicitly call a getter for the `DependencyCollector` and `add`.
** `dependencies.add("implementation", x)` becomes `getImplementation().add(x)`
* You cannot declare dependencies with the `Map` notation from Kotlin and Java.
Use multi-argument methods instead in Kotlin and Java.