class FormAjaxSubscriberTest

class FormAjaxSubscriberTest extends UnitTestCase {
  
  /**
   * @var \Drupal\Core\Form\EventSubscriber\FormAjaxSubscriber
   */
  protected $subscriber;
  
  /**
   * @var \Drupal\Core\Form\FormAjaxResponseBuilderInterface|\PHPUnit\Framework\MockObject\MockObject
   */
  protected $formAjaxResponseBuilder;
  
  /**
   * @var \Symfony\Component\HttpKernel\HttpKernelInterface|\PHPUnit\Framework\MockObject\MockObject
   */
  protected $httpKernel;
  
  /**
   * The mocked string translation.
   *
   * @var \Drupal\Core\StringTranslation\TranslationInterface|\PHPUnit\Framework\MockObject\MockObject
   */
  protected $stringTranslation;
  
  /**
   * The mocked messenger.
   *
   * @var \Drupal\Core\Messenger\MessengerInterface|\PHPUnit\Framework\MockObject\MockObject
   */
  protected $messenger;
  
  /**
   * The event used to derive the response.
   *
   * @var \Symfony\Component\HttpKernel\Event\ExceptionEvent
   */
  protected $event = NULL;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->httpKernel = $this->createMock('Symfony\\Component\\HttpKernel\\HttpKernelInterface');
    $this->formAjaxResponseBuilder = $this->createMock('Drupal\\Core\\Form\\FormAjaxResponseBuilderInterface');
    $this->stringTranslation = $this->getStringTranslationStub();
    $this->messenger = $this->createMock(MessengerInterface::class);
    $this->subscriber = new FormAjaxSubscriber($this->formAjaxResponseBuilder, $this->stringTranslation, $this->messenger);
  }
  
  /**
   * @covers ::onException
   */
  public function testOnException() : void {
    $form = [
      '#type' => 'form',
      '#build_id' => 'the_build_id',
    ];
    $expected_form = $form + [
      '#build_id_old' => 'the_build_id',
    ];
    $form_state = new FormState();
    $exception = new FormAjaxException($form, $form_state);
    $request = new Request([], [
      'form_build_id' => 'the_build_id',
    ]);
    $commands = [];
    $response = new Response('');
    $this->formAjaxResponseBuilder
      ->expects($this->once())
      ->method('buildResponse')
      ->with($request, $expected_form, $form_state, $commands)
      ->willReturn($response);
    $this->assertResponseFromException($request, $exception, $response);
    $this->assertTrue($this->event
      ->isAllowingCustomResponseCode());
    $this->assertSame(200, $this->event
      ->getResponse()
      ->getStatusCode());
  }
  
  /**
   * @covers ::onException
   */
  public function testOnExceptionNewBuildId() : void {
    $form = [
      '#type' => 'form',
      '#build_id' => 'the_build_id',
    ];
    $expected_form = $form + [
      '#build_id_old' => 'a_new_build_id',
    ];
    $form_state = new FormState();
    $exception = new FormAjaxException($form, $form_state);
    $request = new Request([], [
      'form_build_id' => 'a_new_build_id',
    ]);
    $commands = [];
    $response = new Response('');
    $this->formAjaxResponseBuilder
      ->expects($this->once())
      ->method('buildResponse')
      ->with($request, $expected_form, $form_state, $commands)
      ->willReturn($response);
    $this->assertResponseFromException($request, $exception, $response);
    $this->assertTrue($this->event
      ->isAllowingCustomResponseCode());
    $this->assertSame(200, $this->event
      ->getResponse()
      ->getStatusCode());
  }
  
  /**
   * @covers ::onException
   */
  public function testOnExceptionOtherClass() : void {
    $request = new Request();
    $exception = new \Exception();
    $this->formAjaxResponseBuilder
      ->expects($this->never())
      ->method('buildResponse');
    $this->assertResponseFromException($request, $exception, NULL);
  }
  
  /**
   * @covers ::onException
   */
  public function testOnExceptionResponseBuilderException() : void {
    $form = [
      '#type' => 'form',
      '#build_id' => 'the_build_id',
    ];
    $expected_form = $form + [
      '#build_id_old' => 'the_build_id',
    ];
    $form_state = new FormState();
    $exception = new FormAjaxException($form, $form_state);
    $request = new Request([], [
      'form_build_id' => 'the_build_id',
    ]);
    $commands = [];
    $expected_exception = new HttpException(500, 'The specified #ajax callback is empty or not callable.');
    $this->formAjaxResponseBuilder
      ->expects($this->once())
      ->method('buildResponse')
      ->with($request, $expected_form, $form_state, $commands)
      ->willThrowException($expected_exception);
    $this->assertResponseFromException($request, $exception, NULL);
    $this->assertSame($expected_exception, $this->event
      ->getThrowable());
  }
  
  /**
   * @covers ::onException
   */
  public function testOnExceptionBrokenPostRequest() : void {
    $this->formAjaxResponseBuilder
      ->expects($this->never())
      ->method('buildResponse');
    $this->messenger
      ->expects($this->once())
      ->method('addError');
    $this->subscriber = new FormAjaxSubscriber($this->formAjaxResponseBuilder, $this->getStringTranslationStub(), $this->messenger);
    $rendered_output = 'the rendered output';
    // CommandWithAttachedAssetsTrait::getRenderedContent() will call the
    // renderer service via the container.
    $renderer = $this->createMock('Drupal\\Core\\Render\\RendererInterface');
    $renderer->expects($this->once())
      ->method('renderRoot')
      ->with()
      ->willReturnCallback(function (&$elements) use ($rendered_output) {
      $elements['#attached'] = [];
      return $rendered_output;
    });
    $container = new ContainerBuilder();
    $container->set('renderer', $renderer);
    \Drupal::setContainer($container);
    $exception = new BrokenPostRequestException((int) (32 * 1000000.0));
    $request = new Request([
      FormBuilderInterface::AJAX_FORM_REQUEST => TRUE,
    ]);
    $event = new ExceptionEvent($this->httpKernel, $request, HttpKernelInterface::MAIN_REQUEST, $exception);
    $this->subscriber
      ->onException($event);
    $this->assertTrue($event->isAllowingCustomResponseCode());
    $actual_response = $event->getResponse();
    $this->assertInstanceOf('\\Drupal\\Core\\Ajax\\AjaxResponse', $actual_response);
    $this->assertSame(200, $actual_response->getStatusCode());
    $expected_commands[] = [
      'command' => 'insert',
      'method' => 'prepend',
      'selector' => NULL,
      'data' => $rendered_output,
      'settings' => NULL,
    ];
    $this->assertSame($expected_commands, $actual_response->getCommands());
  }
  
  /**
   * @covers ::onException
   * @covers ::getFormAjaxException
   */
  public function testOnExceptionNestedException() : void {
    $form = [
      '#type' => 'form',
      '#build_id' => 'the_build_id',
    ];
    $expected_form = $form + [
      '#build_id_old' => 'the_build_id',
    ];
    $form_state = new FormState();
    $form_exception = new FormAjaxException($form, $form_state);
    $exception = new \Exception('', 0, $form_exception);
    $request = new Request([], [
      'form_build_id' => 'the_build_id',
    ]);
    $commands = [];
    $response = new Response('');
    $this->formAjaxResponseBuilder
      ->expects($this->once())
      ->method('buildResponse')
      ->with($request, $expected_form, $form_state, $commands)
      ->willReturn($response);
    $this->assertResponseFromException($request, $exception, $response);
  }
  
  /**
   * @covers ::getFormAjaxException
   */
  public function testOnExceptionNestedWrongException() : void {
    $nested_exception = new \Exception();
    $exception = new \Exception('', 0, $nested_exception);
    $request = new Request();
    $this->formAjaxResponseBuilder
      ->expects($this->never())
      ->method('buildResponse');
    $this->assertResponseFromException($request, $exception, NULL);
  }
  
  /**
   * Asserts that the expected response is derived from the given exception.
   *
   * @param \Symfony\Component\HttpFoundation\Request $request
   *   The request.
   * @param \Exception $exception
   *   The exception to pass to the event.
   * @param \Symfony\Component\HttpFoundation\Response|null $expected_response
   *   The response expected to be set on the event.
   *
   * @internal
   */
  protected function assertResponseFromException(Request $request, \Exception $exception, ?Response $expected_response) : void {
    $this->event = new ExceptionEvent($this->httpKernel, $request, HttpKernelInterface::MAIN_REQUEST, $exception);
    $this->subscriber
      ->onException($this->event);
    $this->assertSame($expected_response, $this->event
      ->getResponse());
  }

}