如何在单元测试中处理模拟的RxJava2可观察抛出异常
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过去几周我一直在使用MVP在Android中在Kotlin做TDD.事情进展顺利.
我使用Mockito来模拟类,但我似乎无法克服如何实现我想要运行的测试之一.
以下是我的测试:
>调用api,接收数据列表,然后显示列表. loadAllPlacesTest()
>调用api,接收空数据,然后显示列表. loadEmptyPlacesTest()
>调用api,路上会发生一些异常,然后显示错误信息. loadExceptionPlacesTest()
我成功地测试了#1和#2.问题在于#3,我不确定如何在代码中进行测试.
RestApiInterface.kt
interface RestApiInterface {
@GET(RestApiManager.PLACES_URL)
fun getPlacesPagedObservable(
@Header("header_access_token") accessToken: String?,
@Query("page") page: Int?
): Observable<PlacesWrapper>
}
RestApiManager.kt
实现接口的manager类如下所示:
open class RestApiManager: RestApiInterface{
var api: RestApiInterface
internal set
internal var retrofit: Retrofit
init {
val logging = HttpLoggingInterceptor()
// set your desired log level
logging.setLevel(HttpLoggingInterceptor.Level.BODY)
val client = okhttp3.OkHttpClient().newBuilder()
.readTimeout(60, TimeUnit.SECONDS)
.connectTimeout(60, TimeUnit.SECONDS)
.addInterceptor(LoggingInterceptor())
.build()
retrofit = Retrofit.Builder()
.baseUrl(BASE_URL)
.client(client)
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())//very important for RXJAVA and retrofit
.build()
api = retrofit.create(RestApiInterface::class.java)
}
override fun getPlacesPagedObservable(accessToken: String?, page: Int?): Observable<PlacesWrapper> {
//return throw Exception("sorry2")
return api.getPlacesPagedObservable(
accessToken,
page)
}
}
}
这是我的单元测试:
class PlacesPresenterImplTest : AndroidTest(){
lateinit var presenter:PlacesPresenterImpl
lateinit var view:PlacesView
lateinit var apiManager:RestApiManager
//lateinit var apiManager:RestApiManager
val EXCEPTION_MESSAGE1 = "SORRY"
val MANY_PLACES = Arrays.asList(PlaceItem(), PlaceItem());
var EXCEPTION_PLACES = Arrays.asList(PlaceItem(), PlaceItem());
val manyPlacesWrapper = PlacesWrapper(MANY_PLACES)
var exceptionPlacesWrapper = PlacesWrapper(EXCEPTION_PLACES)
val emptyPlacesWrapper = PlacesWrapper(Collections.emptyList())
@After
fun clear(){
RxJavaPlugins.reset()
}
@Before
fun init(){
//MOCKS THE subscribeOn(Schedulers.io()) to use the same thread the test is being run on
//Schedulers.trampoline() runs the test in the same thread used by the test
RxJavaPlugins.setIoSchedulerHandler { t -> Schedulers.trampoline() }
view = Mockito.mock<PlacesView>(PlacesView::class.java)
apiManager = Mockito.mock(RestApiManager::class.java)
presenter = PlacesPresenterImpl(view,context(), Bundle(), Schedulers.trampoline())
presenter.apiManager = apiManager
//exceptionPlacesWrapper = throw Exception(EXCEPTION_MESSAGE1);
}
@Test
fun loadAllPlacesTest() {
Mockito.`when`(apiManager.getPlacesPagedObservable(Mockito.anyString(), Mockito.anyInt())).thenReturn(Observable.just(manyPlacesWrapper))
presenter.__populate()
Mockito.verify(view, Mockito.atLeastOnce()).__showLoading()
Mockito.verify(view, Mockito.atLeastOnce())._showList()
Mockito.verify(view).__hideLoading()
Mockito.verify(view).__showFullScreenMessage(Mockito.anyString())
}
@Test
fun loadEmptyPlacesTest() {
Mockito.`when`(apiManager.getPlacesPagedObservable(Mockito.anyString(), Mockito.anyInt())).thenReturn(Observable.just(emptyPlacesWrapper))
presenter.__populate()
Mockito.verify(view, Mockito.atLeastOnce()).__showLoading()
Mockito.verify(view, Mockito.atLeastOnce())._showList()
Mockito.verify(view).__hideLoading()
Mockito.verify(view).__showFullScreenMessage(Mockito.anyString())
}
@Test
fun loadExceptionPlacesTest() {
Mockito.`when`(apiManager.getPlacesPagedObservable(Mockito.anyString(), Mockito.anyInt())).thenThrow(Exception(EXCEPTION_MESSAGE1))
presenter.__populate()
Mockito.verify(view, Mockito.atLeastOnce()).__showLoading()
Mockito.verify(view, Mockito.never())._showList()
Mockito.verify(view).__hideLoading()
Mockito.verify(view).__showFullScreenMessage(EXCEPTION_MESSAGE1)
}
}
PlacesPresenterImpl.kt
这是主持人.
class PlacesPresenterImpl
constructor(var view: PlacesView, var context: Context, var savedInstanceState:Bundle?, var mainThread: Scheduler)
: BasePresenter(), BasePresenterInterface, PlacesPresenterInterface {
lateinit var apiManager:RestApiInterface
var placeListRequest: Disposable? = null
override fun __firstInit() {
apiManager = RestApiManager()
}
override fun __init(context: Context, savedInstanceState: Bundle, view: BaseView?) {
this.view = view as PlacesView
if (__isFirstTimeLoad())
__firstInit()
}
override fun __destroy() {
placeListRequest?.dispose()
}
override fun __populate() {
_callPlacesApi()
}
override fun _callPlacesApi() {
view.__showLoading()
apiManager.getPlacesPagedObservable("", 0)
.subscribeOn(Schedulers.io())
.observeOn(mainThread)
.subscribe (object : DisposableObserver<PlacesWrapper>() {
override fun onNext(placesWrapper: PlacesWrapper) {
placesWrapper?.let {
val size = placesWrapper.place?.size
view.__hideLoading()
view._showList()
System.out.println("Great I found " + size + " records of places.")
view.__showFullScreenMessage("Great I found " + size + " records of places.")
}
System.out.println("onNext()")
}
override fun one rror(e: Throwable) {
System.out.println("onError()")
//e.printStackTrace()
view.__hideLoading()
if (ExceptionsUtil.isNoNetworkException(e)){
view.__showFullScreenMessage("So sad, can not connect to network to get place list.")
}else{
view.__showFullScreenMessage("Oops, something went wrong. ["+e.localizedMessage+"]")
}
this.dispose()
}
override fun onComplete() {
this.dispose()
//System.out.printf("onComplete()")
}
})
}
private fun _getEventCompletionObserver(): DisposableObserver<String> {
return object : DisposableObserver<String>() {
override fun onNext(taskType: String) {
//_log(String.format("onNext %s task", taskType))
}
override fun one rror(e: Throwable) {
//_log(String.format("Dang a task timeout"))
//Timber.e(e, "Timeout Demo exception")
}
override fun onComplete() {
//_log(String.format("task was completed"))
}
}
}}
loadExceptionPlacesTest()的问题/问题
>我不确定为什么代码不会转到Presenter的onError().
如果我错了,请纠正我,但这就是我的想法:
>
a – `apiManager.getPlacesPagedObservable(“”,0)`observable本身抛出一个异常,这就是为什么`.subscribe()`不能发生/继续,并且观察者的方法不会被调用,
>
b – 当observable中的操作遇到类似JSONException的异常时,它只会转到onError()
>对于loadExceptionPlacesTest(),我认为上面的1b是让演示者的onError()调用并使测试通过的方法.它是否正确?如果是在测试中如何做到这一点.如果不是,你们可以指出我错过了什么或做错了吗?
解决方法:
我将把它留在这里以供将来参考,并且能够详细说明,即使我已在评论中回答.
您要完成的是将流放入onError流中.不幸的是,通过嘲笑它:
Mockito.`when`(apiManager.getPlacesPagedObservable(
Mockito.anyString(), Mockito.anyInt()))
.thenThrow(Exception(EXCEPTION_MESSAGE1))
你实际上是在告诉Mockito以一种只调用apiManager.getPlacesPagedObservable(anystring,anystring)的方式来设置你的模拟应该抛出一个异常.
确实,在Rx流中抛出异常将导致整个流停止并以onError方法结束.但是,这正是您正在使用的方法的问题.抛出异常时,您不在流中.
相反,你要做的是告诉Mockito,一旦你调用apiManager.getPlacesPagedObservable(anystring,anystring),你想要返回一个最终会出现在onError中的流.使用Observable.error()可以很容易地实现这一点:
Mockito.`when`(apiManager.getPlacesPagedObservable(
Mockito.a??nyString(), Mockito.anyInt()))
.thenReturn(Observable.error(
Exception(EXCEPTION_MESSAGE1)))
(你可能需要在这里添加一些类型信息Observable.error(),你可能还需要使用别的东西而不是可观察的 – 单一的,可完成的等等)
上面的模拟将告诉Mockito设置你的模拟返回一个可以在订阅时出错的observable.这将反过来将您的订阅者直接置于具有指定异常的onError流中.
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