kotlin和ArgumentCaptor - IllegalStateException

时间：2016-01-13 18:07:55

标签： android robolectric kotlin

我有通过ArgumentCaptor捕获Class参数的问题。我的测试类看起来像这样：

@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);
    }
}

当我运行测试时，抛出以下异常：
java.lang.IllegalStateException：classCaptor.capture（）不能为null
是否可以在kotlin中使用参数捕获者？

====== 更新1：
Kotlin：1.0.0-beta-4584
Mockito：1.10.19
Robolectric：3.0

====== 更新2：
 堆栈跟踪：

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)

8 个答案:

答案 0 :(得分：27)

对于某些人来说，谷歌在Android架构回购中提供了一个文件MockitoKotlinHelpers.kt。它提供了一种方便的方式来调用捕获..只需调用 verify(activityHandlerMock).navigateTo(capture(classCaptor), capture(booleanCaptor))

答案 1 :(得分：26)

classCaptor.capture()的返回值为null，但IActivityHandler#navigateTo(Class, Boolean)的签名不允许空参数。

mockito-kotlin库提供了解决此问题的支持功能。

答案 2 :(得分：4)

如CoolMind in the comment所述，您首先需要为Kotlin-Mockito添加gradle导入，然后转移所有导入以使用此库。您的导入现在将如下所示：

import { Component, TemplateRef } from '@angular/core';
import { BsModalService } from 'ngx-bootstrap/modal';
import { BsModalRef } from 'ngx-bootstrap/modal/bs-modal-ref.service';


@Component({
    selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent{
  modalRef: BsModalRef;

  config = {
    backdrop: true,
    ignoreBackdropClick: true
  };

  constructor(private modalService: BsModalService) {}
  person:any={}
  openModal(template: TemplateRef<any>) {
    this.modalRef = this.modalService.show(template, this.config);
  }

  openModalWithComponent() {

    this.modalRef = this.modalService.show(ModalContentComponent);
    this.modalRef.content.title = 'Modal with component';

  }
}

/* This is a component which we pass in modal*/

@Component({
  selector: 'modal-content',
  template: `
    <div class="modal-header">
      <h4 class="modal-title pull-left">{{title}}</h4>

    </div>
    <div class="modal-body">
    <input type="text" placeholder="Last Name">

    </div>
    <div class="modal-footer">
      <button type="button" class="btn btn-primary" >Save Last Name</button>
    </div>
  `
})
export class ModalContentComponent {
  title: string;
  constructor(private modalService: BsModalService) {}
}

然后您的测试课程将是这样的：

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

答案 3 :(得分：3)

根据this solution我的解决方案：

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())

答案 4 :(得分：3)

使用kotlin-mockito https://mvnrepository.com/artifact/com.nhaarman/mockito-kotlin/1.5.0作为依赖项和示例代码，如下所示：

   argumentCaptor<Hotel>().apply {
            verify(hotelSaveService).save(capture())

            assertThat(allValues.size).isEqualTo(1)
            assertThat(firstValue.name).isEqualTo("Hilton Hotel")
            assertThat(firstValue.totalRoomCount).isEqualTo(10000L)
            assertThat(firstValue.freeRoomCount).isEqualTo(5000L)

        }

答案 5 :(得分：0)

在kotlin-Mockito图书馆没有帮助之后来到这里。 我用反射创建了一个解决方案。 它是一个提取先前提供给模拟对象的参数的函数：

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

使用方法： （假设我已经模拟了我的存储库并测试了一个viewModel。在使用MenuObject对象调用viewModel的“update（）”方法之后，我想确保MenuObject实际上调用了存储库的“updateMenuObject（）”方法：

viewModel.update(menuObjectToUpdate)
val arg = getTheArgOfUsedFunctionInMockObject(mockedRepo, mockedRepo::updateMenuObject, MenuObject::class.java)
assertEquals(menuObjectToUpdate, arg)

答案 6 :(得分：0)

您可以为参数捕获器写一个包装器

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
    }
}

答案 7 :(得分：0)

另一种方法：

/**
 * 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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