Espresso Idling Resource Example

final IdlingResource.ResourceCallback[] resourceCallbacks = new IdlingResource.ResourceCallback[1];
jobManager.addCallback(new JobManagerCallbackAdapter() {
    @Override
    public void onJobAdded(@NonNull Job job) {
        jobCount.incrementAndGet();
    }

    @Override
    public void onDone(@NonNull Job job) {
        if (jobCount.decrementAndGet() == 0 && resourceCallbacks[0] != null) {
            resourceCallbacks[0].onTransitionToIdle();
        }
    }
});
Espresso.registerIdlingResources(new IdlingResource() {
    @Override
    public String getName() {
        return "job-manager";
    }

    @Override
    public boolean isIdleNow() {
        return jobCount.get() == 0;
    }

    @Override
    public void registerIdleTransitionCallback(ResourceCallback callback) {
        resourceCallbacks[0] = callback;
    }
});