我正在尝试对使用 Kotlin 协程制作的演示者进行单元测试,这也是我第一次使用 Mockito
每当我尝试运行单元测试时,它第一次尝试在协程中对我的视图执行任何操作时都会收到以下错误
Exception in thread "main @coroutine#1 @coroutine#2" java.lang.NullPointerException
at .signin.SignInPresenter$subscribe$1.doResume(SignInPresenter.kt:45)
at kotlin.coroutines.experimental.jvm.internal.CoroutineImpl.resume(CoroutineImpl.kt:54)
at kotlinx.coroutines.experimental.DispatchedKt.resumeCancellable(Dispatched.kt:208)
at kotlinx.coroutines.experimental.intrinsics.CancellableKt.startCoroutineCancellable(Cancellable.kt:35)
at kotlinx.coroutines.experimental.CoroutineStart.invoke(CoroutineStart.kt:111)
at kotlinx.coroutines.experimental.AbstractCoroutine.start(AbstractCoroutine.kt:161)
at kotlinx.coroutines.experimental.BuildersKt.launch(Builders.kt:68)
at kotlinx.coroutines.experimental.BuildersKt.launch$default(Builders.kt:61)
at .signin.SignInPresenter.subscribe(SignInPresenter.kt:42)
这是我的演示者的相关部分,错误中引用的行是view.showSigninPanel
class SignInPresenter(
private val view: SignInContract.View,
private val userRepo: ParseAuthController,
private val contextPool: CoroutineContextProvider
) : SignInContract.Presenter {
private val coroutineJobs: MutableList<Job> = mutableListOf()
override fun subscribe() {
view.loadBackgroundImage()
view.setUpSignInPanel()
view.setUpKeyboardListener()
coroutineJobs.add(launch(contextPool.Main) {
if (!userRepo.isAuthenticated()) {
view.showSignInPanel()
subscribeToLoginValidation()
subscribeToPaswordEmailValidation()
} else {
view.launchMainActivity()
}
})
}
呼叫userRepo.isAuthenticated()
是暂停呼叫
根据本文,我正在将测试协程上下文传递给我的演示者
https://android.jlelse.eu/mastering-coroutines-android-unit-tests-8bc0d082bf15
class TestContextProvider : CoroutineContextProvider() {
override val Main: CoroutineContext = Unconfined
override val IO: CoroutineContext = Unconfined
}
这是我目前的单元测试
class SignInPresenterTest {
private lateinit var view: SignInContract.View
private lateinit var presenter: SignInPresenter
private lateinit var parseAuthController: ParseAuthController
@Before
fun setUp() {
view = mock(SignInContract.View::class.java)
parseAuthController = mock(ParseAuthController::class.java)
presenter = SignInPresenter(
view,
parseAuthController,
TestContextProvider()
)
}
@After
fun tearDown() {
presenter.dispose()
}
@Test
fun subscribeNotAuthenticatedShowSignInPanel() {
runBlocking {
val expectedResult = false
`when`(parseAuthController.isAuthenticated()).thenReturn(expectedResult)
presenter.subscribe()
}
verify(view).showSignInPanel()
}
}
更新:我一直在做一些额外的测试,看起来如果我在我的演示者中删除暂停调用if (!userRepo.isAuthenticated())
它不会崩溃,我可以验证是否有东西在 Mockito 上运行,但这不是一个实际的解决方案.. .但是那个挂起电话的东西会引起问题吗?