Can not test suspend function with runBlockingTest

[champChayangkoon]

I'm testing service with runBlockingTest but not work, But if use runBlocking instead runBlockingTest it's work

error when use runBlockingTest
java.lang.IllegalStateException: This job has not completed yet

my code

class ServiceTest {
    @get:Rule
    val mainCoroutineRule = MainCoroutineRule()

    @get:Rule
    val instantExecutorRule = InstantTaskExecutorRule()

    private var mockWebServer = MockWebServer()
    private lateinit var service: Service

    @Before
    fun setup() {
        mockWebServer.start()
        service = Retrofit.Builder()
                .baseUrl(mockWebServer.url("/"))
                .addConverterFactory(GsonConverterFactory.create())
                .build()
                .create(Service::class.java)
    }

    @After
    fun tearDown() {
        mockWebServer.shutdown()
    }

    @Test(expected = HttpException::class)
    fun testService() {
        val mockResponse = MockResponse().setResponseCode(HttpURLConnection.HTTP_BAD_GATEWAY)
        mockWebServer.enqueue(mockResponse)
        mainCoroutineRule.runBlockingTest {
            val response = service.testService()
        }
    }

[jzbrooks]

Probably related: Kotlin/kotlinx.coroutines#1204

[JakeWharton]

Yep, that's it. Can't be fixed by us. We use threads (or, more specifically, OkHttp does) to perform work asynchronously from the caller.