Cannot correctly test a Queued Notification with email

Hi,

I am trying to properly test a Notification via email on a queue so that I can be absolutely clear that one user received it and another type of user did not.

The code works correctly, but I cannot get the test right. I am assuming that the reason is that I don't have a worker on the Queue during testing so the job is never processed and I am not certain how to change that. I have attempted to use the 'assertQueued' method, but no joy. Can anyone give me some suggestions please?

A User reports a Concern and another user is notified: In the Controller

    //Other stuff
    event(new ConcernReported($concern));

In the Listener

    public function handle(ConcernReported $event)
     {
            $dsl->notify(new NotifyDslOfConcern($event->concern, $dsl));
      }

The Notification class sends an email (standard MailMessage).

In my test I have attempted:

/** @test */
    public function notifications_for_new_concerns_only_go_to_dsls_from_that_school()
    {
        Notification::fake();
        Mail::fake();

        $dsl = create(User::class);
        $dslFromOtherSchool = create(User::class);


        $this->actingAs($dsl)
            ->post('/safeguarding/concern/report', [
                'concern' => [
                    'incident_at' => Carbon::now(),
                    'reason' => 'A reason',
                    'details' => 'Some details'
                ]
            ])
            ->assertStatus(200);

    $concern = Concern::first();

    //Assert sent to DSL
         Mail::assertQueued(MailMessage::class, function ($mail) use ($dsl) {
            return $mail->dsl->id === $dsl->id;
        });

        Notification::assertSentTo(
            $dsl,
            NotifyDslOfConcern::class,
            function ($notification) use ($concern) {
                return $notification->concern->id === $concern->id;
            }
        );


    //Assert NOT sent to other user
    Mail::assertNotQueued(...);

    Notification::assertNotSentTo(
            [$dslFromOtherSchool],  NotifyDslOfConcern::class
        );
    }