Testing async tasks with robolectric

Question

Do you know how to implement unit testing for AsyncTasks using Robolectric ? Any pointers will be appreciated.

Answer 1

Call execute(...) on the task, then to wait for the result call Robolectric.runBackgroundTasks()/Robolectric.flushBackgroundThreadScheduler() then you can assert.

@Test public void test() {     //create task     MyAsyncTask asyncTask = new MyAsyncTask();      //start task     asyncTask.execute(...);      //wait for task code     // Robolectric.runBackgroundTasks(); (pre 3.0)     Robolectric.flushBackgroundThreadScheduler(); //from 3.0      //can run asserts on result now     assert...(asyncTask.get()); } 

Answer 2

With Robolectric 2.4 this is now in ShadowApplication:

ShadowApplication.runBackgroundTasks();