]

        when:
        step.execute(work, context)

        then:
        _ * work.visitImplementations(_) >> { UnitOfWork.ImplementationVisitor visitor ->
            visitor.visitImplementation(implementationSnapshot)
            additionalImplementations.each {
                visitor.visitImplementation(it)
            }
        }
        interaction { snapshotState() }

                return "output"
            }

            @Override
            void visitImplementations(UnitOfWork.ImplementationVisitor visitor) {
                visitor.visitImplementation(implementation)
                visitor.visitImplementation(Object)
            }

            @Override
            void visitRegularInputs(UnitOfWork.InputVisitor visitor) {

        }

        @Override
        public void visitImplementation(Class<?> implementation) {
            visitImplementation(ImplementationSnapshot.of(implementation, classLoaderHierarchyHasher));
        }

        @Override
        public void visitImplementation(ImplementationSnapshot implementation) {
            if (this.implementation == null) {

        work.visitImplementations(new UnitOfWork.ImplementationVisitor() {
            @Override
            public void visitImplementation(Class<?> implementation) {
                workClass.set(GeneratedSubclasses.unpack(implementation));
            }

            @Override
            public void visitImplementation(ImplementationSnapshot implementation) {
            }
        });