class StandardJavascriptTest

class StandardJavascriptTest extends WebDriverTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected $profile = 'standard';
  
  /**
   * Tests BigPipe accelerates particular Standard installation profile routes.
   */
  public function testBigPipe() {
    $this->drupalLogin($this->drupalCreateUser([
      'access content',
      'post comments',
      'skip comment approval',
    ]));
    $node = Node::create([
      'type' => 'article',
    ])->setTitle($this->randomMachineName())
      ->setPromoted(TRUE)
      ->setPublished();
    $node->save();
    // Front page: one placeholder, for messages.
    $this->drupalGet('');
    $this->assertBigPipePlaceholderReplacementCount(1);
    // Node page: 2 placeholders:
    // 1. messages
    // 2. comment form
    $this->drupalGet($node->toUrl());
    $this->assertBigPipePlaceholderReplacementCount(2);
  }
  
  /**
   * Asserts the number of BigPipe placeholders that are replaced on the page.
   *
   * @param int $expected_count
   *   The expected number of BigPipe placeholders.
   */
  protected function assertBigPipePlaceholderReplacementCount($expected_count) : void {
    $web_assert = $this->assertSession();
    $web_assert->waitForElement('css', 'script[data-big-pipe-event="stop"]');
    $page = $this->getSession()
      ->getPage();
    $this->assertCount($expected_count, $this->getDrupalSettings()['bigPipePlaceholderIds']);
    $this->assertCount($expected_count, $page->findAll('css', 'script[data-big-pipe-replacement-for-placeholder-with-id]'));
  }

}