Set<File> filesToDelete = new HashSet<>();
        work.visitOutputs(context.getWorkspace(), new UnitOfWork.OutputVisitor() {
            @Override
            public void visitOutputProperty(String propertyName, TreeType type, UnitOfWork.OutputFileValueSupplier value) {
                Streams.stream(value.getFiles())
                    .filter(cleanupRegistry::isOutputOwnedByBuild)

        OutputFileValueSupplier instrumentedOutputValue = OutputFileValueSupplier.fromStatic(instrumentedOutput, fileCollectionFactory.fixed(instrumentedOutput));
        visitor.visitOutputProperty("instrumentedOutput", TreeType.DIRECTORY, instrumentedOutputValue);
    }

    @Override
    public WorkOutput execute(ExecutionRequest executionRequest) {
        File workspace = executionRequest.getWorkspace();

        then:
        result == delegateResult

        _ * work.shouldCleanupStaleOutputs() >> true
        _ * work.visitOutputs(_) { UnitOfWork.OutputVisitor visitor ->
            visitor.visitOutputProperty("output", TreeType.FILE, UnitOfWork.OutputFileValueSupplier.fromStatic(target, TestFiles.fixed(target)))
        }

        _ * cleanupRegistry.isOutputOwnedByBuild(target) >> ownedByBuild

            }

            @Override
            void visitOutputs(File workspace, UnitOfWork.OutputVisitor visitor) {
                outputs.forEach { name, spec ->
                    visitor.visitOutputProperty(name, spec.treeType, UnitOfWork.OutputFileValueSupplier.fromStatic(spec.root, TestFiles.fixed(spec.root)))
                }
            }

            @Override