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[英]How can I do unit testing of a method which is making retrofit call inside of AndroidViewModel class?
[英]Unit testing RxJava + Retrofit call inside the method
我要测试的方法包含两次对改造服务的调用:
internal fun poll(): Completable {
return presenceService.askForFrequency(true).toObservable()
.flatMap { it -> Observable.interval(it.frequency, TimeUnit.SECONDS, Schedulers.io()) }
.flatMapCompletable { _ -> presenceService.sendHeartbeat() }
.subscribeOn(Schedulers.io())
.retry()
}
presenceService
被注入到该类中,因此我为测试提供了一个模拟的:
val frequency = PublishSubject.create<Presence>()
val heartbeat = PublishSubject.create<Unit>()
val mockPresenceService = mock<PresenceService> {
on { askForFrequency(any()) } doReturn frequency
on { sendHeartbeat() } doReturn heartbeat
}
该检查askForFrequency
方法是否被调用的测试可以正常工作,但检查该轮询请求已发送的测试却无法正常工作:
@Test
fun presenceService_sentHeartbeat() {
RxJavaPlugins.setIoSchedulerHandler { scheduler }
frequency.onNext(Presence(1)) //polls with 1s interval
heartbeat.onNext(Unit)
presenceMaintainer.onActivityResumed(any())
scheduler.advanceTimeBy(2, TimeUnit.SECONDS)
verify(mockPresenceService).askForFrequency(true) //works correctly
verify(mockPresenceService).sendHeartbeat() //never works
}
来自单元测试运行的日志为:
Wanted but not invoked:
presenceService.sendHeartbeat();
However, there was exactly 1 interaction with this mock:
presenceService.askForFrequency(true);
问题是: 如何测试第二个方法( sendHeartbeat
)是否也被调用(可能多次) ?
同时,我发现问题出在第二个平面图中,因为对此方法的测试正常进行(验证该方法被调用了60次):
internal fun pollTest(): Observable<Presence> {
return Observable.interval(1, TimeUnit.SECONDS, Schedulers.io())
.subscribeOn(Schedulers.io())
.flatMap { it -> presenceService.askForFrequency(true).toObservable() }
}
@Test
fun presenceService_sentHeartbeat() {
frequency.onNext(Presence(1))
val result = arrayListOf<Unit>()
presenceMaintainer.pollTest().subscribe({ t -> result.add(Unit) })
Thread.sleep(60*1000)
println(result.size)
verify(mockPresenceService, Times(60)).askForFrequency(true)
}
但是,当我更改对askForFrequency -> map to interval -> map each tick to poll call
的调用askForFrequency -> map to interval -> map each tick to poll call
,测试停止工作,并且模拟仅被调用一次。
默认情况下, Observable.interval()
在计算调度程序上运行,而不是在io调度程序上运行。 这意味着2秒钟的等待将实时运行,因此您的测试将在调用sendHeartBeat()
之前2秒完成。
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