Illuminate\Support\Facades\Facade::setFacadeApplication PHP Method

    public static function setFacadeApplication($app)
    {
        static::$app = $app;
    }

 /**
  * Bootstrap the test environemnt:
  * - Create an application instance and register it within itself.
  * - Register the package service provider with the app.
  * - Set the APP facade.
  *
  * @return void
  */
 public function setUp()
 {
     $app = new Application();
     $app->instance('app', $app);
     $app->register('Ideil\\LaravelFileOre\\LaravelFileOreServiceProvider');
     Facade::setFacadeApplication($app);
 }