How to make MockWebServer work?
<p>I am developing an app using the MVP architecture. I am trying to test the Interactors of my app using MockWebServer. Well, I have this test:</p>

<pre><code>@RunWith(RobolectricTestRunner::class)
@Config(constants = BuildConfig::class, manifest = "src/main/AndroidManifest.xml", packageName = "br.com.simplepass.simplepassnew", sdk = intArrayOf(23))
class LoginInteractorImplTest {

    lateinit var mLoginInteractor : LoginInteractor
    lateinit var mServer: MockWebServer


    @Before
    fun setUp(){
        mLoginInteractor = LoginInteractorImpl()
        mServer = MockWebServer()
        mServer.start()
    }

    @Test
    fun loginTest(){
        mServer.url("http://192.168.0.10:8080/login")

        val testSubscriber = TestSubscriber.create&lt;User&gt;()

        mLoginInteractor.login("31991889992", "lala").subscribe(testSubscriber)
        testSubscriber.assertNoErrors()
//        testSubscriber.assertCompleted()
    }

    @After
    fun tearDown(){
        mServer.shutdown()
    }
}
</code></pre>

<p>But, when I uncomment the assertCompleted on the TestSubscriber, I always get assertionError... I know the TestSubscriber works, because I use it in other tests. </p>

<p>Here is my ApiCall:</p>

<pre><code>@GET("login")
fun login() : Observable&lt;User&gt;
</code></pre>

<p>My NetModule:</p>

<pre><code>@Module
class NetModule(val mBaseUrl: String) {

    @Provides
    @Singleton
    fun provideHttpCache(application: Application): Cache {
        val cacheSize = 10 * 1024 * 1024
        return Cache(application.cacheDir, cacheSize.toLong())

    }

    @Provides
    @Singleton
    fun provideOkhttpClient(cache: Cache) : OkHttpClient {
        val client = OkHttpClient.Builder()

        val interceptor = HttpLoggingInterceptor()
        interceptor.level = HttpLoggingInterceptor.Level.BODY

        client.addInterceptor(interceptor)
        return client.cache(cache).build()
    }

    @Provides
    @Singleton
    fun provideRetrofit(okHttpClient: OkHttpClient): Retrofit {
        return Retrofit.Builder()


          .baseUrl(mBaseUrl)
            .addConverterFactory(GsonConverterFactory.create())
            .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
            .client(okHttpClient)
            .build()
    }
}
</code></pre>

<p>And my base URL (There's no backend server... could be anything):</p>

<pre><code>&lt;string name="api_base_url"&gt;http://192.168.0.12:8080&lt;/string&gt;
</code></pre>

<p>So, What am I missing? This code should be working...</p>

<p>Any help is welcome!</p>

<p><strong>EDIT:</strong></p>

<p>So, I changed the code to this:</p>

<pre><code>mLoginInteractor = LoginInteractorImpl()
        mServer = MockWebServer()

        mServer.enqueue(MockResponse()
                .setResponseCode(200)
                .setBody(Gson().toJson(User(1, "991889992", "Leandro", "123"))))

        mServer.start()

        val client = OkHttpClient.Builder()
        val cacheSize = 10 * 1024 * 1024

        client.cache(Cache(application.cacheDir, cacheSize.toLong())).build()

        mLoginInteractor.setRetrofit(Retrofit.Builder()
                .baseUrl(mServer.url("/"))
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.client(client.cache(Cache(application.cacheDir, cacheSize.toLong())).build())
                .build())
</code></pre>

<p>And this:</p>

<pre><code>val testSubscriber = TestSubscriber.create&lt;User&gt;()

        mLoginInteractor.login("31991889992", "lala").subscribe(testSubscriber)
        testSubscriber.assertNoErrors()
        testSubscriber.assertReceivedOnNext(listOf(User(1, "991889992", "Leandro", "123")))
        testSubscriber.assertCompleted()
</code></pre>

<p>But I still get this error:</p>

<pre><code>Number of items does not match. Provided: 1  Actual: 0.
Provided values: [User(id=1, phoneNumber=991889992, name=Leandro, password=123)]
Actual values: []
</code></pre>