[英]kotlin and ArgumentCaptor - IllegalStateException
我在通過 ArgumentCaptor 捕獲 Class 參數時遇到問題。 我的測試類如下所示:
@RunWith(RobolectricGradleTestRunner::class)
@Config(sdk = intArrayOf(21), constants = BuildConfig::class)
class MyViewModelTest {
@Mock
lateinit var activityHandlerMock: IActivityHandler;
@Captor
lateinit var classCaptor: ArgumentCaptor<Class<BaseActivity>>
@Captor
lateinit var booleanCaptor: ArgumentCaptor<Boolean>
private var objectUnderTest: MyViewModel? = null
@Before
fun setUp() {
initMocks(this)
...
objectUnderTest = MyViewModel(...)
}
@Test
fun thatNavigatesToAddListScreenOnAddClicked(){
//given
//when
objectUnderTest?.addNewList()
//then
verify(activityHandlerMock).navigateTo(classCaptor.capture(), booleanCaptor.capture())
var clazz = classCaptor.value
assertNotNull(clazz);
assertFalse(booleanCaptor.value);
}
}
當我運行測試時,拋出以下異常:
java.lang.IllegalStateException: classCaptor.capture() 不能為 null
是否可以在 kotlin 中使用參數捕獲器?
========== 更新 1:
科特林:1.0.0-beta-4584
Mockito:1.10.19
機器人電子:3.0
========== 更新 2:
堆棧跟蹤:
java.lang.IllegalStateException: classCaptor.capture() must not be null
at com.example.view.model.ShoplistsViewModelTest.thatNavigatesToAddListScreenOnAddClicked(ShoplistsViewModelTest.kt:92)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:251)
at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:188)
at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:54)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.robolectric.RobolectricTestRunner$1.evaluate(RobolectricTestRunner.java:152)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
從這個博客
“讓匹配器與 Kotlin 一起工作可能是一個問題。如果你有一個用 kotlin 編寫的方法不接受可空參數,那么我們無法使用 Mockito.any() 匹配它。這是因為它可以返回 void,這是不可分配給不可為空的參數。如果匹配的方法是用 Java 編寫的,那么我認為它會起作用,因為所有 Java 對象都是隱式可為空的。”
需要一個將ArgumentCaptor.capture()
作為可為空類型返回的包裝函數。
將以下內容作為輔助方法添加到您的測試中
fun <T> capture(argumentCaptor: ArgumentCaptor<T>): T = argumentCaptor.capture()
請參閱 Android Architecture repo 中 Google 提供的MockitoKotlinHelpers.kt以供參考。 capture
函數提供了一種方便的方法來調用ArgumentCaptor.capture()
。 稱呼
verify(activityHandlerMock).navigateTo(capture(classCaptor), capture(booleanCaptor))
更新:如果上述解決方案對您不起作用,請在下面的評論中查看 Roberto Leinardi 的解決方案。
classCaptor.capture()
的返回值為空,但IActivityHandler#navigateTo(Class, Boolean)
的簽名不允許空參數。
mockito-kotlin庫提供了支持功能來解決這個問題。
代碼應該是:
@Captor
lateinit var classCaptor: ArgumentCaptor<Class<BaseActivity>>
@Captor
lateinit var booleanCaptor: ArgumentCaptor<Boolean>
...
@Test
fun thatNavigatesToAddListScreenOnAddClicked(){
//given
//when
objectUnderTest?.addNewList()
//then
verify(activityHandlerMock).navigateTo(
com.nhaarman.mockitokotlin2.capture<Class<BaseActivity>>(classCaptor.capture()),
com.nhaarman.mockitokotlin2.capture<Boolean>(booleanCaptor.capture())
)
var clazzValue = classCaptor.value
assertNotNull(clazzValue);
val booleanValue = booleanCaptor.value
assertFalse(booleanValue);
}
或者
var classCaptor = com.nhaarman.mockitokotlin2.argumentCaptor<Class<BaseActivity>>()
var booleanCaptor = com.nhaarman.mockitokotlin2.argumentCaptor<Boolean>()
...
verify(activityHandlerMock).navigateTo(
classCaptor.capture(),
booleanCaptor.capture()
)
同樣在 build.gradle 中添加:
testImplementation "com.nhaarman.mockitokotlin2:mockito-kotlin:2.2.0"
使用 kotlin-mockito https://mvnrepository.com/artifact/com.nhaarman/mockito-kotlin/1.5.0作為依賴項和示例代碼,如下所示:
argumentCaptor<Hotel>().apply {
verify(hotelSaveService).save(capture())
assertThat(allValues.size).isEqualTo(1)
assertThat(firstValue.name).isEqualTo("İstanbul Hotel")
assertThat(firstValue.totalRoomCount).isEqualTo(10000L)
assertThat(firstValue.freeRoomCount).isEqualTo(5000L)
}
正如CoolMind 在評論中所述,您首先需要為Kotlin-Mockito添加 gradle 導入,然后轉移所有導入以使用此庫。 您的導入現在看起來像:
import com.nhaarman.mockitokotlin2.argumentCaptor
import com.nhaarman.mockitokotlin2.any
import com.nhaarman.mockitokotlin2.eq
import com.nhaarman.mockitokotlin2.isNull
import com.nhaarman.mockitokotlin2.mock
import com.nhaarman.mockitokotlin2.verify
那么你的測試類將是這樣的:
val mArgumentCaptor = argumentCaptor<SignUpInteractor.Callback>()
@Test
fun signUp_success() {
val customer = Customer().apply {
name = "Test Name"
email = "test@example.com"
phone = "0123444456789"
phoneDdi = "+92"
phoneNumber = ""
countryCode = "92"
password = "123456"
}
mPresenter.signUp(customer)
verify(mView).showProgress()
verify(mInteractor).createAccount(any(), isNull(), mArgumentCaptor.capture())
}
根據這個解決方案,我的解決方案在這里:
fun <T> uninitialized(): T = null as T
//open verificator
val verificator = verify(activityHandlerMock)
//capture (would be same with all matchers)
classCaptor.capture()
booleanCaptor.capture()
//hack
verificator.navigateTo(uninitialized(), uninitialized())
在 kotlin-Mockito 庫沒有幫助之后來到這里。 我使用反射創建了一個解決方案。 它是一個提取先前提供給模擬對象的參數的函數:
fun <T: Any, S> getTheArgOfUsedFunctionInMockObject(mockedObject: Any, function: (T) -> S, clsOfArgument: Class<T>): T{
val argCaptor= ArgumentCaptor.forClass(clsOfArgument)
val ver = verify(mockedObject)
argCaptor.capture()
ver.javaClass.methods.first { it.name == function.reflect()!!.name }.invoke(ver, uninitialized())
return argCaptor.value
}
private fun <T> uninitialized(): T = null as T
用法:(假設我已經模擬了我的存儲庫並測試了一個 viewModel。在使用 MenuObject 對象調用 viewModel 的“update()”方法后,我想確保 MenuObject 實際上調用了存儲庫的“updateMenuObject()”方法:
viewModel.update(menuObjectToUpdate)
val arg = getTheArgOfUsedFunctionInMockObject(mockedRepo, mockedRepo::updateMenuObject, MenuObject::class.java)
assertEquals(menuObjectToUpdate, arg)
您可以在參數捕獲器上編寫包裝器
class CaptorWrapper<T:Any>(private val captor:ArgumentCaptor<T>, private val obj:T){
fun capture():T{
captor.capture()
return obj
}
fun captor():ArgumentCaptor<T>{
return captor
}
}
另一種方法:
/**
* Use instead of ArgumentMatcher.argThat(matcher: ArgumentMatcher<T>)
*/
fun <T> safeArgThat(matcher: ArgumentMatcher<T>): T {
ThreadSafeMockingProgress.mockingProgress().argumentMatcherStorage
.reportMatcher(matcher)
return uninitialized()
}
@Suppress("UNCHECKED_CAST")
private fun <T> uninitialized(): T = null as T
用法:
verify(spiedElement, times(1)).method(
safeArgThat(
CustomMatcher()
)
)
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