IdlingResource Espresso with RxJava

Question

I recently converted my application from using async tasks to rxjava. Now, my espresso tests no longer wait for my data calls to complete due to espresso not having an idling r

Answer 1

Wrote a little integration piece between RxJava Plugins and Espresso. Hope this helps someone else.

https://gist.github.com/digitalbuddha/d886eae1578bca78b9bf

Edit:

There is a much easier way to accomplish this task. Add the following rule to your tests

public class AsyncTaskSchedulerRule implements TestRule {
    final Scheduler asyncTaskScheduler = Schedulers.from(AsyncTask.THREAD_POOL_EXECUTOR);

    @Override
    public Statement apply(Statement base, Description description) {
        return new Statement() {
            @Override
            public void evaluate() throws Throwable {
                RxJavaHooks.setOnIOScheduler(scheduler -> asyncTaskScheduler);
                RxJavaHooks.setOnComputationScheduler(scheduler -> asyncTaskScheduler);
                RxJavaHooks.setOnNewThreadScheduler(scheduler -> asyncTaskScheduler);
                try {
                    base.evaluate();
                } finally {
                    RxJavaHooks.reset();
                }
            }
        };
    }
}