Tests for Event Listeners sendin email

I'm quite new to testing so any help would be appreciated. First things first, this is my code inside App directory (Laravel 5.5)

// controller
public function store(Request $request)
{    
        $foo = new Foo($request->only([
            'value 1', 
            'value 2', 
            'value 3',
        ]));
        $foo->save();

        event(new FooCreated($foo));

        return redirect()->route('/');
}

// Events/FooCreated
use App\Foo;

class FooCreated
{
    use Dispatchable, InteractsWithSockets, SerializesModels;

    public $foo;

    /**
     * Create a new event instance.
     *
     * @return void
     */
    public function __construct(Foo $foo)
    {
        $this->foo = $foo;
    }
}


// Listeners/

use App\Events\FooCreated;
use App\Mail\FooSendingEmail;

class EmailSendListener
{

    /**
     * Handle the event.
     *
     * @param  EnquiryWasCreated  $event
     * @return void
     */
    public function handle(FooCreated $event)
    {
        \Mail::to($event->foo->email)->send(new FooSendingEmail($event->foo));
    }
}

Now, I'm trying to write some tests for the event and the listener that triggers the email to sent, so I have created a method in unit/ExampleTest.php

public function testEventTriggered(){
    Event::fake();

    $foo = factory(\App\Foo::class)->create();

    Event::assertDispatched(FooEvent::class, function($event) use ($foo){
         return $event->foo->id == $foo->id;
    });
}

// assume similar this applies for emails according to docs https://laravel.com/docs/5.5/mocking#mail-fake

but when I run this test, fails with error The expected [App\Events\FooEvent] event was not dispatched. Failed asserting that false is true.

How can I fix the testfor events to pass and also to test sending email ?

Thanks in advance.

via Chebli Mohamed