@Override
    public void addTaskExecutionGraphListener(TaskExecutionGraphListener listener) {
        graphListeners.add(
            decorateListener("TaskExecutionGraph.addTaskExecutionGraphListener", listener)
        );
    }

    private TaskExecutionGraphListener decorateListener(String registrationPoint, TaskExecutionGraphListener listener) {
        return listenerBuildOperationDecorator.decorate(
            registrationPoint,

        def id
        def decoratedListener

        when:
        context.apply(Stub(UserCodeSource)) {
            id = it
            decoratedListener = decorator.decorateUnknownListener('foo', listener) as ComboListener
        }

        then:
        !decoratedListener.is(listener)

        when:
        decoratedListener.settingsEvaluated(settingsEvaluatedArg)

        then: