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[英]Making junit test case for interactor/presenter in android(kotlin) using mockito
[英]How to test/mock API with JUnit Mockito in Kotlin
我正在嘗試使用kotlin在Android應用程序中編寫單元測試。 getPosts()
從https://jsonplaceholder.typicode.com/posts
獲取getPosts()
列表
我想比較此計數或您建議的任何其他方式來測試此功能。
我對此很陌生,因此任何建議的更正將非常有幫助
到目前為止,這是我嘗試過的。 您的幫助將不勝感激。
[R
@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()
}
}
}
郵政服務
interface PostsService {
@GET("/posts")
fun getPosts(): Flowable<List<PostEntity>>
}
測試用例
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 allPosts = postsRemoteDataSource.getAllPosts()
//PRETTY SURE THE LINE BELLOW IS WRONG I AM TRYING TO COMPARE THE
//COUNT BUT CANNOT GET appPosts.size as it is Flowable type
assertEquals(allPosts , CoreMatchers.`is`(10))
}
}
更新
@Test
fun getAllPosts() {
val postService = mock(PostsService::class.java)
val postsRemoteDataSource = PostsRemoteDataSource(postService)
var mList = listOf<PostEntity>(
PostEntity(1,1,"Title 1", "Body 1"),
PostEntity(1,1,"Title 1", "Body 1")
)
Mockito.`when`(postService.getPosts()).thenReturn(Flowable.fromArray(mList))
val subsciber = postsRemoteDataSource.getAllPosts().test()
assertEquals(subsciber.assertValueCount(10) , 10)
}
}
運行測試時出現錯誤信息
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:41)
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)
選項1
使用blockingFirst()
通過阻塞調用獲取數據:
val allPosts = postsRemoteDataSource.getAllPosts().blockingFirst()
assertEquals(10, allPosts.size)
請注意,在生產代碼中通常對Flowable
進行阻塞調用被認為是不好的做法,但是在測試中這樣做是安全的,因為被測試的對象由模擬支持。
選項2
通過調用test()
獲得一個TestSubscriber
並對其斷言:
val subscriber = postsRemoteDataSource.getAllPosts().test()
subscriber.assertValueCount(10)
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