class PsrResponseSubscriberTest

class PsrResponseSubscriberTest extends UnitTestCase {
    
    /**
     * The tested path root subscriber.
     *
     * @var \Drupal\Core\EventSubscriber\PsrResponseSubscriber
     */
    protected $psrResponseSubscriber;
    
    /**
     * The tested path root subscriber.
     *
     * @var \Symfony\Bridge\PsrHttpMessage\HttpFoundationFactoryInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $httpFoundationFactoryMock;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        $factory = $this->getMockBuilder('Symfony\\Bridge\\PsrHttpMessage\\HttpFoundationFactoryInterface')
            ->disableOriginalConstructor()
            ->getMock();
        $factory->expects($this->any())
            ->method('createResponse')
            ->willReturn($this->createMock('Symfony\\Component\\HttpFoundation\\Response'));
        $this->httpFoundationFactoryMock = $factory;
        $this->psrResponseSubscriber = new PsrResponseSubscriber($this->httpFoundationFactoryMock);
    }
    
    /**
     * Tests altering and finished event.
     *
     * @covers ::onKernelView
     */
    public function testConvertsControllerResult() {
        $event = $this->createEvent($this->createMock('Psr\\Http\\Message\\ResponseInterface'));
        $this->psrResponseSubscriber
            ->onKernelView($event);
        $this->assertInstanceOf(Response::class, $event->getResponse());
    }
    
    /**
     * Tests altering and finished event.
     *
     * @covers ::onKernelView
     */
    public function testDoesNotConvertControllerResult() {
        $event = $this->createEvent([]);
        $this->psrResponseSubscriber
            ->onKernelView($event);
        $this->assertNull($event->getResponse());
        $event = $this->createEvent(NULL);
        $this->psrResponseSubscriber
            ->onKernelView($event);
        $this->assertNull($event->getResponse());
    }
    
    /**
     * Sets up an event that returns $controllerResult.
     *
     * @param mixed $controller_result
     *   The return Object.
     *
     * @return \Symfony\Component\HttpKernel\Event\ViewEvent
     *   A ViewEvent object to test.
     */
    protected function createEvent($controller_result) {
        return new ViewEvent($this->createMock(HttpKernelInterface::class), $this->createMock(Request::class), HttpKernelInterface::MASTER_REQUEST, $controller_result);
    }

}