Android AsyncTask testing with Android Test Framework

Question

I have a very simple AsyncTask implementation example and am having problem in testing it using Android JUnit framework.

It works just fine when I instantiate and e

Answer 1

This can be used if you want to test the result from the doInBackground method. Override the onPostExecute method and perform the tests there. To wait for the AsyncTask to complete use CountDownLatch. The latch.await() waits till the countdown runs from 1 (which is set during initialization) to 0 (which is done by the countdown() method).

@RunWith(AndroidJUnit4.class)
public class EndpointsAsyncTaskTest {

    Context context;

    @Test
    public void testVerifyJoke() throws InterruptedException {
        assertTrue(true);
        final CountDownLatch latch = new CountDownLatch(1);
        context = InstrumentationRegistry.getContext();
        EndpointsAsyncTask testTask = new EndpointsAsyncTask() {
            @Override
            protected void onPostExecute(String result) {
                assertNotNull(result);
                if (result != null){
                    assertTrue(result.length() > 0);
                    latch.countDown();
                }
            }
        };
        testTask.execute(context);
        latch.await();
    }