factory.stop()
            instant.stopped
        }

        then:
        instant.stopped > instant.completed1
        instant.stopped > instant.completed2
    }

    def cannotStopExecutorFromAnExecutorThread() {
        when:
        def executor = factory.create('<display-name>')
        def action = {
            executor.stop()
        }
        executor.execute(action)
        executor.stop()