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android - JUnit 错误 AssertionError 值计数不同 预期：10 实际 1

问题描述

我正在我的 Android 应用程序中编写一个简单的 JUnit 测试，我正在测试接收到的记录数，但出现错误java.lang.AssertionError: Value counts differ; Expected: 10, Actual: 1 (latch = 0, values = 1, errors = 0, completions = 1)

这是我要测试的内容，它是一个从 API 获取 POSTS 数据的函数。

我的实际也是10，但我不确定我在哪里做错了。

我对此很陌生，请您建议

测试

class PostsRemoteDataSourceTest {



    @Before
    fun init() {
        MockitoAnnotations.initMocks(this)
    }

    @Test
    fun getAllPosts() {
        val postService = mock(PostsService::class.java)
        val postsRemoteDataSource = PostsRemoteDataSource(postService)

        var mList = listOf<PostEntity>()

        Mockito.`when`(postService.getPosts()).thenReturn(Flowable.fromArray(mList))

        val subsciber = postsRemoteDataSource.getAllPosts().test()


        assertEquals(subsciber.assertValueCount(10) , 10)

    }
}

PostRemoteDataSource

    @Singleton
class PostsRemoteDataSource @Inject constructor(
    private val postsService: PostsService
): PostsDataSource {


    override fun getAllPosts(): Flowable<List<PostEntity>> {
        return postsService.getPosts()
            .flatMap { posts ->
                Flowable.fromIterable(posts)
                    .take(10)
                    .toList().toFlowable()
            }
    }


}

邮政服务

interface PostsService {

@GET("/posts")
fun getPosts(): Flowable<List<PostEntity>>

}

这是错误消息


    at io.reactivex.observers.BaseTestConsumer.fail(BaseTestConsumer.java:189)
    at io.reactivex.observers.BaseTestConsumer.assertValueCount(BaseTestConsumer.java:515)
    at com.rao.com.idealarchitecture.data.remote.PostsRemoteDataSourceTest.getAllPosts(PostsRemoteDataSourceTest.kt:38)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    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.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    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$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)```

标签： androidkotlinjunitmockitorx-java

解决方案

assertEquals(subsciber.assertValueCount(10), 10)

我觉得问题出在这行代码上，assertValueCount 本身就是比较检查。在其上添加 assertEquals，使其与 assertValueCount 函数的返回进行比较。

因此，正确的方法是：

subsciber.assertValueCount(10)

请试试这个方法！

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