Fenos\Notifynder\Contracts\NotifynderSender::extend PHP Method

    public function extend($name, $extendSender);

 /** @test */
 function it_send_with_an_custom_sender()
 {
     $this->senders->extend('sendCustom', function ($notification, $app) {
         return new CustomDefaultSender($notification, $app->make('notifynder'));
     });
     $category_name = 'my.category';
     $this->createCategory(['name' => $category_name]);
     $singleNotification = $this->builder->category($category_name)->to(1)->from(2)->url('www.notifynder.io')->toArray();
     $this->senders->sendCustom($singleNotification);
     $this->assertCount(1, Notification::all());
 }