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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
我要測試的方法包含兩次對改造服務的調用:
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
被注入到該類中,因此我為測試提供了一個模擬的:
val frequency = PublishSubject.create<Presence>()
val heartbeat = PublishSubject.create<Unit>()
val mockPresenceService = mock<PresenceService> {
on { askForFrequency(any()) } doReturn frequency
on { sendHeartbeat() } doReturn heartbeat
}
該檢查askForFrequency
方法是否被調用的測試可以正常工作,但檢查該輪詢請求已發送的測試卻無法正常工作:
@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
}
來自單元測試運行的日志為:
Wanted but not invoked:
presenceService.sendHeartbeat();
However, there was exactly 1 interaction with this mock:
presenceService.askForFrequency(true);
問題是: 如何測試第二個方法( sendHeartbeat
)是否也被調用(可能多次) ?
同時,我發現問題出在第二個平面圖中,因為對此方法的測試正常進行(驗證該方法被調用了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,當我更改對askForFrequency -> map to interval -> map each tick to poll call
的調用askForFrequency -> map to interval -> map each tick to poll call
,測試停止工作,並且模擬僅被調用一次。
默認情況下, Observable.interval()
在計算調度程序上運行,而不是在io調度程序上運行。 這意味着2秒鍾的等待將實時運行,因此您的測試將在調用sendHeartBeat()
之前2秒完成。
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