Learn Spring for Android Application Development

Coroutine testing

The runBlocking coroutine builder can be used for testing. This creates a coroutine that uses a current thread. The test within the JUnit framework may look as follows:

class ExampleUnitTest {    @Test    fun comicLoading() = runBlocking {        val image = async { loadImage() }.await()        assertNotNull(image)    }}

This snippet loads an image using the async coroutine builder, and checks that the image is not null. The source code of the runBlocking function looks as follows:

@Throws(InterruptedException::class)public fun <T> runBlocking(context: CoroutineContext = EmptyCoroutineContext, block: suspend CoroutineScope.() -> T): T {    val currentThread = Thread.currentThread()    val contextInterceptor = context[ContinuationInterceptor]    val privateEventLoop ...