Laravel [5.3|5.4] testing dispatch of job within a job

I'm struggling to understand how I could test a dispatch of a job within another job. I'll provide a code sample.

This is my main job class, we can call it father

final class FatherJob implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

/**
 * Create a new job instance.
 */
public function __construct()
{
}

/**
 * Execute the job.
 *
 * @return void
 */
public function handle()
{
    \Log::info("Hello World, I'm the father.");

    dispatch(new ChildJob());
}
}

Then we have the child job

final class ChildJob implements ShouldQueue
{
use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

/**
 * Create a new job instance.
 */
public function __construct()
{
}

/**
 * Execute the job.
 *
 * @return void
 */
public function handle()
{
    \Log::info("I'm the child");
}
}

The test has been set as following

final class JobTest extends TestCase
{
/** @test */
public function it_has_been_dispatched()
{
    $this->expectsJobs(ChildJob::class);
    dispatch(New FatherJob ());
}
}

This test fails, of course that's the whole point of the question, but why?

I've done some digging and I presume that the problem relies on the call withoutJobs() inside expectsJobs(), it seems that withoutJobs() distrupt the current queue thus it doesn't allow to call the rest of the jobs but maybe I am totally off track.

If this logic is intended, how can I create a test suite that allows me to check if the job within a job has been called?

Thank you in advance.

via Chebli Mohamed