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);
  }

}