gistfile1.php

<?php

// inside tests
        $event = \Mockery::mock('Wj\ShiftSymfonyBundle\Event\RequestEvent');
        $event->shouldReceive('getRequest')
            ->atLeast()->once();

// the class
class RequestEvent
{
    /**
     * @var Request
     */
    private $request;

    /**
     * @var Request
     */
    public function __construct($request)
    {
        $this->setRequest($request);
    }

    /**
     * @return Request
     */
    public function getRequest()
    {
        return $this->request;
    }

    protected function setRequest(Request $request)
    {
        $this->request = $request;
    }
}


// ERROR
-- Argument 1 passed to Wj\ShiftSymfonyBundle\Event\RequestEvent::setRequest() must be an instance of S
ymfony\Component\HttpFoundation\Request, null given