waitsForAsyncCallback().callbackLater { }
    }

    def "can check that an action blocks until an asynchronous action is finished"() {
        Runnable action = Mock()
        def operation = waitsForAsyncActionToComplete()
        def latch = new CountDownLatch(1)

        when:
        operation.start {
            start { action.run() }
            latch.await()
        }
        finished()

        return new WaitForAsyncCallback(this)
    }

    /**
     * Creates a new action which waits until an async. action is complete.
     */
    WaitForAsyncAction waitsForAsyncActionToComplete() {
        return new WaitForAsyncAction(this)
    }

    /**
     * Returns a composite participant, which you can use to perform atomic operations on.
     *