public function withoutObservers($observers)
    {
        $observers = is_array($observers) ? $observers : [$observers];

        array_map(function ($observer) {
            $this->app->bind($observer, function () use ($observer) {
                return $this->getMockBuilder($observer)->disableOriginalConstructor()->getMock();
            });
        }, $observers);

        return $this;
    }