BigPipe example

class ManyPlaceholderTest extends UnitTestCase {

  /** * @covers \Drupal\big_pipe\Render\BigPipe::sendNoJsPlaceholders */
  public function testManyNoJsPlaceHolders() {
    $session = $this->prophesize(SessionInterface::class);
    $session->start()->willReturn(TRUE);
    $session->save()->shouldBeCalled();
    $bigpipe = new BigPipe(
      $this->prophesize(RendererInterface::class)->reveal(),
      $session->reveal(),
      $this->prophesize(RequestStack::class)->reveal(),
      $this->prophesize(HttpKernelInterface::class)->reveal(),
      $this->prophesize(EventDispatcherInterface::class)->reveal(),
      $this->prophesize(ConfigFactoryInterface::class)->reveal()
    );
    $response = new BigPipeResponse(new HtmlResponse());

    // Add many placeholders.     $many_placeholders = [];