class BigPipeTest in Drupal 9

Same name and namespace in other branches

8 core/modules/big_pipe/tests/src/Functional/BigPipeTest.php \Drupal\Tests\big_pipe\Functional\BigPipeTest

Tests BigPipe's no-JS detection & response delivery (with and without JS).

Covers:

@group big_pipe

Hierarchy

class \Drupal\Tests\BrowserTestBase extends \PHPUnit\Framework\TestCase uses \Symfony\Bridge\PhpUnit\ExpectDeprecationTrait, FunctionalTestSetupTrait, TestSetupTrait, AssertLegacyTrait, BlockCreationTrait, ConfigTestTrait, ExtensionListTestTrait, ContentTypeCreationTrait, NodeCreationTrait, PhpUnitCompatibilityTrait, RandomGeneratorTrait, TestRequirementsTrait, PhpUnitWarnings, UiHelperTrait, UserCreationTrait, XdebugRequestTrait
- class \Drupal\Tests\big_pipe\Functional\BigPipeTest

Expanded class hierarchy of BigPipeTest

File

core/modules/big_pipe/tests/src/Functional/BigPipeTest.php, line 28

Namespace

Drupal\Tests\big_pipe\Functional

View source

class BigPipeTest extends BrowserTestBase {

  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'big_pipe',
    'big_pipe_test',
    'dblog',
  ];

  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'classy';

  /**
   * {@inheritdoc}
   */
  protected $dumpHeaders = TRUE;

  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();

    // Ignore the <meta> refresh that big_pipe.module sets. It causes a redirect
    // to a page that sets another cookie, which causes BrowserTestBase to lose
    // the session cookie. To avoid this problem, tests should first call
    // drupalGet() and then call checkForMetaRefresh() manually, and then reset
    // $this->maximumMetaRefreshCount and $this->metaRefreshCount.
    // @see doMetaRefresh()
    $this->maximumMetaRefreshCount = 0;
  }

  /**
   * Performs a single <meta> refresh explicitly.
   *
   * This test disables the automatic <meta> refresh checking, each time it is
   * desired that this runs, a test case must explicitly call this.
   *
   * @see setUp()
   */
  protected function performMetaRefresh() {
    $this->maximumMetaRefreshCount = 1;
    $this
      ->checkForMetaRefresh();
    $this->maximumMetaRefreshCount = 0;
    $this->metaRefreshCount = 0;
  }

  /**
   * Tests BigPipe's no-JS detection.
   *
   * Covers:
   * - big_pipe_page_attachments()
   * - \Drupal\big_pipe\Controller\BigPipeController
   */
  public function testNoJsDetection() {
    $no_js_to_js_markup = '<script>document.cookie = "' . BigPipeStrategy::NOJS_COOKIE . '=1; path=/; expires=Thu, 01 Jan 1970 00:00:00 GMT"</script>';

    // 1. No session (anonymous).
    $this
      ->drupalGet(Url::fromRoute('<front>'));
    $this
      ->assertSessionCookieExists(FALSE);
    $this
      ->assertBigPipeNoJsCookieExists(FALSE);
    $this
      ->assertSession()
      ->responseNotContains('<noscript><meta http-equiv="Refresh" content="0; URL=');
    $this
      ->assertSession()
      ->responseNotContains($no_js_to_js_markup);

    // 2. Session (authenticated).
    $this
      ->drupalLogin($this->rootUser);
    $this
      ->assertSessionCookieExists(TRUE);
    $this
      ->assertBigPipeNoJsCookieExists(FALSE);
    $this
      ->assertSession()
      ->responseContains('<noscript><meta http-equiv="Refresh" content="0; URL=' . base_path() . 'big_pipe/no-js?destination=' . UrlHelper::encodePath(base_path() . 'user/1?check_logged_in=1') . '" />' . "\n" . '</noscript>');
    $this
      ->assertSession()
      ->responseNotContains($no_js_to_js_markup);
    $this
      ->assertBigPipeNoJsMetaRefreshRedirect();
    $this
      ->assertBigPipeNoJsCookieExists(TRUE);
    $this
      ->assertSession()
      ->responseNotContains('<noscript><meta http-equiv="Refresh" content="0; URL=');
    $this
      ->assertSession()
      ->responseContains($no_js_to_js_markup);
    $this
      ->drupalLogout();

    // Close the prior connection and remove the collected state.
    $this
      ->getSession()
      ->reset();

    // 3. Session (anonymous).
    $this
      ->drupalGet(Url::fromRoute('user.login', [], [
      'query' => [
        'trigger_session' => 1,
      ],
    ]));
    $this
      ->drupalGet(Url::fromRoute('user.login'));
    $this
      ->assertSessionCookieExists(TRUE);
    $this
      ->assertBigPipeNoJsCookieExists(FALSE);
    $this
      ->assertSession()
      ->responseContains('<noscript><meta http-equiv="Refresh" content="0; URL=' . base_path() . 'big_pipe/no-js?destination=' . base_path() . 'user/login" />' . "\n" . '</noscript>');
    $this
      ->assertSession()
      ->responseNotContains($no_js_to_js_markup);
    $this
      ->assertBigPipeNoJsMetaRefreshRedirect();
    $this
      ->assertBigPipeNoJsCookieExists(TRUE);
    $this
      ->assertSession()
      ->responseNotContains('<noscript><meta http-equiv="Refresh" content="0; URL=');
    $this
      ->assertSession()
      ->responseContains($no_js_to_js_markup);

    // Close the prior connection and remove the collected state.
    $this
      ->getSession()
      ->reset();

    // Edge case: route with '_no_big_pipe' option.
    $this
      ->drupalGet(Url::fromRoute('no_big_pipe'));
    $this
      ->assertSessionCookieExists(FALSE);
    $this
      ->assertBigPipeNoJsCookieExists(FALSE);
    $this
      ->assertSession()
      ->responseNotContains('<noscript><meta http-equiv="Refresh" content="0; URL=');
    $this
      ->assertSession()
      ->responseNotContains($no_js_to_js_markup);
    $this
      ->drupalLogin($this->rootUser);
    $this
      ->drupalGet(Url::fromRoute('no_big_pipe'));
    $this
      ->assertSessionCookieExists(TRUE);
    $this
      ->assertBigPipeNoJsCookieExists(FALSE);
    $this
      ->assertSession()
      ->responseNotContains('<noscript><meta http-equiv="Refresh" content="0; URL=');
    $this
      ->assertSession()
      ->responseNotContains($no_js_to_js_markup);
  }

  /**
   * Tests BigPipe-delivered HTML responses when JavaScript is enabled.
   *
   * Covers:
   * - \Drupal\big_pipe\EventSubscriber\HtmlResponseBigPipeSubscriber
   * - \Drupal\big_pipe\Render\BigPipe
   * - \Drupal\big_pipe\Render\BigPipe::sendPlaceholders()
   *
   * @see \Drupal\big_pipe_test\BigPipePlaceholderTestCases
   */
  public function testBigPipe() {

    // Simulate production.
    $this
      ->config('system.logging')
      ->set('error_level', ERROR_REPORTING_HIDE)
      ->save();
    $this
      ->drupalLogin($this->rootUser);
    $this
      ->assertSessionCookieExists(TRUE);
    $this
      ->assertBigPipeNoJsCookieExists(FALSE);
    $connection = Database::getConnection();
    $log_count = $connection
      ->select('watchdog')
      ->countQuery()
      ->execute()
      ->fetchField();

    // By not calling performMetaRefresh() here, we simulate JavaScript being
    // enabled, because as far as the BigPipe module is concerned, JavaScript is
    // enabled in the browser as long as the BigPipe no-JS cookie is *not* set.
    // @see setUp()
    // @see performMetaRefresh()
    $this
      ->drupalGet(Url::fromRoute('big_pipe_test'));
    $this
      ->assertBigPipeResponseHeadersPresent();
    $this
      ->assertSession()
      ->responseHeaderNotContains('X-Drupal-Cache-Tags', 'cache_tag_set_in_lazy_builder');
    $this
      ->setCsrfTokenSeedInTestEnvironment();
    $cases = $this
      ->getTestCases();
    $this
      ->assertBigPipeNoJsPlaceholders([
      $cases['edge_case__invalid_html']->bigPipeNoJsPlaceholder => $cases['edge_case__invalid_html']->embeddedHtmlResponse,
      $cases['html_attribute_value']->bigPipeNoJsPlaceholder => $cases['html_attribute_value']->embeddedHtmlResponse,
      $cases['html_attribute_value_subset']->bigPipeNoJsPlaceholder => $cases['html_attribute_value_subset']->embeddedHtmlResponse,
    ]);
    $this
      ->assertBigPipePlaceholders([
      $cases['html']->bigPipePlaceholderId => Json::encode($cases['html']->embeddedAjaxResponseCommands),
      $cases['edge_case__html_non_lazy_builder']->bigPipePlaceholderId => Json::encode($cases['edge_case__html_non_lazy_builder']->embeddedAjaxResponseCommands),
      $cases['exception__lazy_builder']->bigPipePlaceholderId => NULL,
      $cases['exception__embedded_response']->bigPipePlaceholderId => NULL,
    ], [
      0 => $cases['edge_case__html_non_lazy_builder']->bigPipePlaceholderId,
      // The 'html' case contains the 'status messages' placeholder, which is
      // always rendered last.
      1 => $cases['html']->bigPipePlaceholderId,
    ]);
    $this
      ->assertSession()
      ->responseContains('</body>');

    // Verifying BigPipe assets are present.
    $this
      ->assertFalse(empty($this
      ->getDrupalSettings()), 'drupalSettings present.');
    $this
      ->assertContains('big_pipe/big_pipe', explode(',', $this
      ->getDrupalSettings()['ajaxPageState']['libraries']), 'BigPipe asset library is present.');

    // Verify that the two expected exceptions are logged as errors.
    $this
      ->assertEquals($log_count + 2, (int) $connection
      ->select('watchdog')
      ->countQuery()
      ->execute()
      ->fetchField(), 'Two new watchdog entries.');

    // Using dynamic select queries with the method range() allows contrib
    // database drivers the ability to insert their own limit and offset
    // functionality.
    $records = $connection
      ->select('watchdog', 'w')
      ->fields('w')
      ->orderBy('wid', 'DESC')
      ->range(0, 2)
      ->execute()
      ->fetchAll();
    $this
      ->assertEquals(RfcLogLevel::ERROR, $records[0]->severity);
    $this
      ->assertStringContainsString('Oh noes!', (string) unserialize($records[0]->variables)['@message']);
    $this
      ->assertEquals(RfcLogLevel::ERROR, $records[1]->severity);
    $this
      ->assertStringContainsString('You are not allowed to say llamas are not cool!', (string) unserialize($records[1]->variables)['@message']);

    // Verify that 4xx responses work fine. (4xx responses are handled by
    // subrequests to a route pointing to a controller with the desired output.)
    $this
      ->drupalGet(Url::fromUri('base:non-existing-path'));

    // Simulate development.
    // Verifying BigPipe provides useful error output when an error occurs
    // while rendering a placeholder if verbose error logging is enabled.
    $this
      ->config('system.logging')
      ->set('error_level', ERROR_REPORTING_DISPLAY_VERBOSE)
      ->save();
    $this
      ->drupalGet(Url::fromRoute('big_pipe_test'));

    // The 'edge_case__html_exception' case throws an exception.
    $this
      ->assertSession()
      ->pageTextContains('The website encountered an unexpected error. Please try again later');
    $this
      ->assertSession()
      ->pageTextContains('You are not allowed to say llamas are not cool!');

    // Check that stop signal and closing body tag are absent.
    $this
      ->assertSession()
      ->responseNotContains(BigPipe::STOP_SIGNAL);
    $this
      ->assertSession()
      ->responseNotContains('</body>');

    // The exception is expected. Do not interpret it as a test failure.
    unlink($this->root . '/' . $this->siteDirectory . '/error.log');
  }

  /**
   * Tests BigPipe-delivered HTML responses when JavaScript is disabled.
   *
   * Covers:
   * - \Drupal\big_pipe\EventSubscriber\HtmlResponseBigPipeSubscriber
   * - \Drupal\big_pipe\Render\BigPipe
   * - \Drupal\big_pipe\Render\BigPipe::sendNoJsPlaceholders()
   *
   * @see \Drupal\big_pipe_test\BigPipePlaceholderTestCases
   */
  public function testBigPipeNoJs() {

    // Simulate production.
    $this
      ->config('system.logging')
      ->set('error_level', ERROR_REPORTING_HIDE)
      ->save();
    $this
      ->drupalLogin($this->rootUser);
    $this
      ->assertSessionCookieExists(TRUE);
    $this
      ->assertBigPipeNoJsCookieExists(FALSE);

    // By calling performMetaRefresh() here, we simulate JavaScript being
    // disabled, because as far as the BigPipe module is concerned, it is
    // enabled in the browser when the BigPipe no-JS cookie is set.
    // @see setUp()
    // @see performMetaRefresh()
    $this
      ->performMetaRefresh();
    $this
      ->assertBigPipeNoJsCookieExists(TRUE);
    $this
      ->drupalGet(Url::fromRoute('big_pipe_test'));
    $this
      ->assertBigPipeResponseHeadersPresent();
    $this
      ->assertSession()
      ->responseHeaderNotContains('X-Drupal-Cache-Tags', 'cache_tag_set_in_lazy_builder');
    $this
      ->setCsrfTokenSeedInTestEnvironment();
    $cases = $this
      ->getTestCases();
    $this
      ->assertBigPipeNoJsPlaceholders([
      $cases['edge_case__invalid_html']->bigPipeNoJsPlaceholder => $cases['edge_case__invalid_html']->embeddedHtmlResponse,
      $cases['html_attribute_value']->bigPipeNoJsPlaceholder => $cases['html_attribute_value']->embeddedHtmlResponse,
      $cases['html_attribute_value_subset']->bigPipeNoJsPlaceholder => $cases['html_attribute_value_subset']->embeddedHtmlResponse,
      $cases['html']->bigPipeNoJsPlaceholder => $cases['html']->embeddedHtmlResponse,
      $cases['edge_case__html_non_lazy_builder']->bigPipeNoJsPlaceholder => $cases['edge_case__html_non_lazy_builder']->embeddedHtmlResponse,
      $cases['exception__lazy_builder']->bigPipePlaceholderId => NULL,
      $cases['exception__embedded_response']->bigPipePlaceholderId => NULL,
    ]);

    // Verifying there are no BigPipe placeholders & replacements.
    $this
      ->assertSession()
      ->responseHeaderEquals('BigPipe-Test-Placeholders', '<none>');

    // Verifying BigPipe start/stop signals are absent.
    $this
      ->assertSession()
      ->responseNotContains(BigPipe::START_SIGNAL);
    $this
      ->assertSession()
      ->responseNotContains(BigPipe::STOP_SIGNAL);

    // Verifying BigPipe assets are absent.
    $this
      ->assertArrayNotHasKey('bigPipePlaceholderIds', $this
      ->getDrupalSettings());
    $this
      ->assertArrayNotHasKey('ajaxPageState', $this
      ->getDrupalSettings());
    $this
      ->assertSession()
      ->responseContains('</body>');

    // Verify that 4xx responses work fine. (4xx responses are handled by
    // subrequests to a route pointing to a controller with the desired output.)
    $this
      ->drupalGet(Url::fromUri('base:non-existing-path'));

    // Simulate development.
    // Verifying BigPipe provides useful error output when an error occurs
    // while rendering a placeholder if verbose error logging is enabled.
    $this
      ->config('system.logging')
      ->set('error_level', ERROR_REPORTING_DISPLAY_VERBOSE)
      ->save();
    $this
      ->drupalGet(Url::fromRoute('big_pipe_test'));

    // The 'edge_case__html_exception' case throws an exception.
    $this
      ->assertSession()
      ->pageTextContains('The website encountered an unexpected error. Please try again later');
    $this
      ->assertSession()
      ->pageTextContains('You are not allowed to say llamas are not cool!');
    $this
      ->assertSession()
      ->responseNotContains('</body>');

    // The exception is expected. Do not interpret it as a test failure.
    unlink($this->root . '/' . $this->siteDirectory . '/error.log');
  }

  /**
   * Tests BigPipe with a multi-occurrence placeholder.
   */
  public function testBigPipeMultiOccurrencePlaceholders() {
    $this
      ->drupalLogin($this->rootUser);
    $this
      ->assertSessionCookieExists(TRUE);
    $this
      ->assertBigPipeNoJsCookieExists(FALSE);

    // By not calling performMetaRefresh() here, we simulate JavaScript being
    // enabled, because as far as the BigPipe module is concerned, JavaScript is
    // enabled in the browser as long as the BigPipe no-JS cookie is *not* set.
    // @see setUp()
    // @see performMetaRefresh()
    $this
      ->drupalGet(Url::fromRoute('big_pipe_test_multi_occurrence'));
    $big_pipe_placeholder_id = 'callback=Drupal%5CCore%5CRender%5CElement%5CStatusMessages%3A%3ArenderMessages&amp;args%5B0%5D&amp;token=_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA';
    $expected_placeholder_replacement = '<script type="application/vnd.drupal-ajax" data-big-pipe-replacement-for-placeholder-with-id="' . $big_pipe_placeholder_id . '">';
    $this
      ->assertSession()
      ->pageTextContains('The count is 1.');
    $this
      ->assertSession()
      ->responseNotContains('The count is 2.');
    $this
      ->assertSession()
      ->responseNotContains('The count is 3.');
    $raw_content = $this
      ->getSession()
      ->getPage()
      ->getContent();
    $this
      ->assertSame(1, substr_count($raw_content, $expected_placeholder_replacement), 'Only one placeholder replacement was found for the duplicate #lazy_builder arrays.');

    // By calling performMetaRefresh() here, we simulate JavaScript being
    // disabled, because as far as the BigPipe module is concerned, it is
    // enabled in the browser when the BigPipe no-JS cookie is set.
    // @see setUp()
    // @see performMetaRefresh()
    $this
      ->performMetaRefresh();
    $this
      ->assertBigPipeNoJsCookieExists(TRUE);
    $this
      ->drupalGet(Url::fromRoute('big_pipe_test_multi_occurrence'));
    $this
      ->assertSession()
      ->pageTextContains('The count is 1.');
    $this
      ->assertSession()
      ->responseNotContains('The count is 2.');
    $this
      ->assertSession()
      ->responseNotContains('The count is 3.');
  }
  protected function assertBigPipeResponseHeadersPresent() {

    // Check that Cache-Control header set to "private".
    $this
      ->assertSession()
      ->responseHeaderContains('Cache-Control', 'private');
    $this
      ->assertSession()
      ->responseHeaderEquals('Surrogate-Control', 'no-store, content="BigPipe/1.0"');
    $this
      ->assertSession()
      ->responseHeaderEquals('X-Accel-Buffering', 'no');
  }

  /**
   * Asserts expected BigPipe no-JS placeholders are present and replaced.
   *
   * @param array $expected_big_pipe_nojs_placeholders
   *   Keys: BigPipe no-JS placeholder markup. Values: expected replacement
   *   markup.
   */
  protected function assertBigPipeNoJsPlaceholders(array $expected_big_pipe_nojs_placeholders) {
    $this
      ->assertSetsEqual(array_keys($expected_big_pipe_nojs_placeholders), array_map('rawurldecode', explode(' ', $this
      ->getSession()
      ->getResponseHeader('BigPipe-Test-No-Js-Placeholders'))));
    foreach ($expected_big_pipe_nojs_placeholders as $big_pipe_nojs_placeholder => $expected_replacement) {

      // Checking whether the replacement for the BigPipe no-JS placeholder
      // $big_pipe_nojs_placeholder is present.
      $this
        ->assertSession()
        ->responseNotContains($big_pipe_nojs_placeholder);
      if ($expected_replacement !== NULL) {
        $this
          ->assertSession()
          ->responseContains($expected_replacement);
      }
    }
  }

  /**
   * Asserts expected BigPipe placeholders are present and replaced.
   *
   * @param array $expected_big_pipe_placeholders
   *   Keys: BigPipe placeholder IDs. Values: expected AJAX response.
   * @param array $expected_big_pipe_placeholder_stream_order
   *   Keys: BigPipe placeholder IDs. Values: expected AJAX response. Keys are
   *   defined in the order that they are expected to be rendered & streamed.
   */
  protected function assertBigPipePlaceholders(array $expected_big_pipe_placeholders, array $expected_big_pipe_placeholder_stream_order) {
    $this
      ->assertSetsEqual(array_keys($expected_big_pipe_placeholders), explode(' ', $this
      ->getSession()
      ->getResponseHeader('BigPipe-Test-Placeholders')));
    $placeholder_positions = [];
    $placeholder_replacement_positions = [];
    foreach ($expected_big_pipe_placeholders as $big_pipe_placeholder_id => $expected_ajax_response) {

      // Verify expected placeholder.
      $expected_placeholder_html = '<span data-big-pipe-placeholder-id="' . $big_pipe_placeholder_id . '"></span>';
      $this
        ->assertSession()
        ->responseContains($expected_placeholder_html);
      $pos = strpos($this
        ->getSession()
        ->getPage()
        ->getContent(), $expected_placeholder_html);
      $placeholder_positions[$pos] = $big_pipe_placeholder_id;

      // Verify expected placeholder replacement.
      $expected_placeholder_replacement = '<script type="application/vnd.drupal-ajax" data-big-pipe-replacement-for-placeholder-with-id="' . $big_pipe_placeholder_id . '">';
      $result = $this
        ->xpath('//script[@data-big-pipe-replacement-for-placeholder-with-id=:id]', [
        ':id' => Html::decodeEntities($big_pipe_placeholder_id),
      ]);
      if ($expected_ajax_response === NULL) {
        $this
          ->assertCount(0, $result);
        $this
          ->assertSession()
          ->responseNotContains($expected_placeholder_replacement);
        continue;
      }
      $this
        ->assertEquals($expected_ajax_response, trim($result[0]
        ->getText()));
      $this
        ->assertSession()
        ->responseContains($expected_placeholder_replacement);
      $pos = strpos($this
        ->getSession()
        ->getPage()
        ->getContent(), $expected_placeholder_replacement);
      $placeholder_replacement_positions[$pos] = $big_pipe_placeholder_id;
    }
    ksort($placeholder_positions, SORT_NUMERIC);
    $this
      ->assertEquals(array_keys($expected_big_pipe_placeholders), array_values($placeholder_positions));
    $placeholders = array_map(function (NodeElement $element) {
      return $element
        ->getAttribute('data-big-pipe-placeholder-id');
    }, $this
      ->cssSelect('[data-big-pipe-placeholder-id]'));
    $this
      ->assertSameSize($expected_big_pipe_placeholders, array_unique($placeholders));
    $expected_big_pipe_placeholders_with_replacements = [];
    foreach ($expected_big_pipe_placeholder_stream_order as $big_pipe_placeholder_id) {
      $expected_big_pipe_placeholders_with_replacements[$big_pipe_placeholder_id] = $expected_big_pipe_placeholders[$big_pipe_placeholder_id];
    }
    $this
      ->assertEquals($expected_big_pipe_placeholders_with_replacements, array_filter($expected_big_pipe_placeholders));
    $this
      ->assertSetsEqual(array_keys($expected_big_pipe_placeholders_with_replacements), array_values($placeholder_replacement_positions));
    $this
      ->assertSame(count($expected_big_pipe_placeholders_with_replacements), preg_match_all('/' . preg_quote('<script type="application/vnd.drupal-ajax" data-big-pipe-replacement-for-placeholder-with-id="', '/') . '/', $this
      ->getSession()
      ->getPage()
      ->getContent()));

    // Verifying BigPipe start/stop signals.
    $this
      ->assertSession()
      ->responseContains(BigPipe::START_SIGNAL);
    $this
      ->assertSession()
      ->responseContains(BigPipe::STOP_SIGNAL);
    $start_signal_position = strpos($this
      ->getSession()
      ->getPage()
      ->getContent(), BigPipe::START_SIGNAL);
    $stop_signal_position = strpos($this
      ->getSession()
      ->getPage()
      ->getContent(), BigPipe::STOP_SIGNAL);
    $this
      ->assertTrue($start_signal_position < $stop_signal_position, 'BigPipe start signal appears before stop signal.');

    // Verifying BigPipe placeholder replacements and start/stop signals were
    // streamed in the correct order.
    $expected_stream_order = array_keys($expected_big_pipe_placeholders_with_replacements);
    array_unshift($expected_stream_order, BigPipe::START_SIGNAL);
    array_push($expected_stream_order, BigPipe::STOP_SIGNAL);
    $actual_stream_order = $placeholder_replacement_positions + [
      $start_signal_position => BigPipe::START_SIGNAL,
      $stop_signal_position => BigPipe::STOP_SIGNAL,
    ];
    ksort($actual_stream_order, SORT_NUMERIC);
    $this
      ->assertEquals($expected_stream_order, array_values($actual_stream_order));
  }

  /**
   * Ensures CSRF tokens can be generated for the current user's session.
   */
  protected function setCsrfTokenSeedInTestEnvironment() {
    $session_data = $this->container
      ->get('session_handler.write_safe')
      ->read($this
      ->getSession()
      ->getCookie($this
      ->getSessionName()));
    $csrf_token_seed = unserialize(explode('_sf2_meta|', $session_data)[1])['s'];
    $this->container
      ->get('session_manager.metadata_bag')
      ->setCsrfTokenSeed($csrf_token_seed);
  }

  /**
   * @return \Drupal\big_pipe_test\BigPipePlaceholderTestCase[]
   */
  protected function getTestCases($has_session = TRUE) {
    return BigPipePlaceholderTestCases::cases($this->container, $this->rootUser);
  }

  /**
   * Asserts whether arrays A and B are equal, when treated as sets.
   */
  protected function assertSetsEqual(array $a, array $b) {
    return count($a) == count($b) && !array_diff_assoc($a, $b);
  }

  /**
   * Asserts whether a BigPipe no-JS cookie exists or not.
   */
  protected function assertBigPipeNoJsCookieExists($expected) {
    $this
      ->assertCookieExists('big_pipe_nojs', $expected, 'BigPipe no-JS');
  }

  /**
   * Asserts whether a session cookie exists or not.
   */
  protected function assertSessionCookieExists($expected) {
    $this
      ->assertCookieExists($this
      ->getSessionName(), $expected, 'Session');
  }

  /**
   * Asserts whether a cookie exists on the client or not.
   */
  protected function assertCookieExists($cookie_name, $expected, $cookie_label) {
    $this
      ->assertEquals($expected, !empty($this
      ->getSession()
      ->getCookie($cookie_name)), $expected ? "{$cookie_label} cookie exists." : "{$cookie_label} cookie does not exist.");
  }

  /**
   * Calls ::performMetaRefresh() and asserts the responses.
   */
  protected function assertBigPipeNoJsMetaRefreshRedirect() {
    $original_url = $this
      ->getSession()
      ->getCurrentUrl();

    // Disable automatic following of redirects by the HTTP client, so that this
    // test can analyze the response headers of each redirect response.
    $this
      ->getSession()
      ->getDriver()
      ->getClient()
      ->followRedirects(FALSE);
    $this
      ->performMetaRefresh();
    $headers[0] = $this
      ->getSession()
      ->getResponseHeaders();
    $statuses[0] = $this
      ->getSession()
      ->getStatusCode();
    $this
      ->performMetaRefresh();
    $headers[1] = $this
      ->getSession()
      ->getResponseHeaders();
    $statuses[1] = $this
      ->getSession()
      ->getStatusCode();
    $this
      ->getSession()
      ->getDriver()
      ->getClient()
      ->followRedirects(TRUE);
    $this
      ->assertEquals($original_url, $this
      ->getSession()
      ->getCurrentUrl(), 'Redirected back to the original location.');

    // First response: redirect.
    $this
      ->assertEquals(302, $statuses[0], 'The first response was a 302 (redirect).');
    $this
      ->assertStringStartsWith('big_pipe_nojs=1', $headers[0]['Set-Cookie'][0], 'The first response sets the big_pipe_nojs cookie.');
    $this
      ->assertEquals($original_url, $headers[0]['Location'][0], 'The first response redirected back to the original page.');
    $this
      ->assertTrue(empty(array_diff([
      'cookies:big_pipe_nojs',
      'session.exists',
    ], explode(' ', $headers[0]['X-Drupal-Cache-Contexts'][0]))), 'The first response varies by the "cookies:big_pipe_nojs" and "session.exists" cache contexts.');
    $this
      ->assertFalse(isset($headers[0]['Surrogate-Control']), 'The first response has no "Surrogate-Control" header.');

    // Second response: redirect followed.
    $this
      ->assertEquals(200, $statuses[1], 'The second response was a 200.');
    $this
      ->assertTrue(empty(array_diff([
      'cookies:big_pipe_nojs',
      'session.exists',
    ], explode(' ', $headers[0]['X-Drupal-Cache-Contexts'][0]))), 'The first response varies by the "cookies:big_pipe_nojs" and "session.exists" cache contexts.');
    $this
      ->assertEquals('no-store, content="BigPipe/1.0"', $headers[1]['Surrogate-Control'][0], 'The second response has a "Surrogate-Control" header.');

    // Check that the <meta> refresh is absent, only one redirect ever happens.
    $this
      ->assertSession()
      ->responseNotContains('<noscript><meta http-equiv="Refresh" content="0; URL=');
  }

}

Members

Name	Modifiers	Type	Description	Overrides
AssertLegacyTrait::assert Deprecated	protected	function
AssertLegacyTrait::assertCacheTag Deprecated	protected	function	Asserts whether an expected cache tag was present in the last response.
AssertLegacyTrait::assertElementNotPresent Deprecated	protected	function	Asserts that the element with the given CSS selector is not present.
AssertLegacyTrait::assertElementPresent Deprecated	protected	function	Asserts that the element with the given CSS selector is present.
AssertLegacyTrait::assertEqual Deprecated	protected	function
AssertLegacyTrait::assertEscaped Deprecated	protected	function	Passes if the raw text IS found escaped on the loaded page, fail otherwise.
AssertLegacyTrait::assertField Deprecated	protected	function	Asserts that a field exists with the given name or ID.
AssertLegacyTrait::assertFieldById Deprecated	protected	function	Asserts that a field exists with the given ID and value.
AssertLegacyTrait::assertFieldByName Deprecated	protected	function	Asserts that a field exists with the given name and value.
AssertLegacyTrait::assertFieldByXPath Deprecated	protected	function	Asserts that a field exists in the current page by the given XPath.
AssertLegacyTrait::assertFieldChecked Deprecated	protected	function	Asserts that a checkbox field in the current page is checked.
AssertLegacyTrait::assertFieldsByValue Deprecated	protected	function	Asserts that a field exists in the current page with a given Xpath result.
AssertLegacyTrait::assertHeader Deprecated	protected	function	Checks that current response header equals value.
AssertLegacyTrait::assertIdentical Deprecated	protected	function
AssertLegacyTrait::assertIdenticalObject Deprecated	protected	function
AssertLegacyTrait::assertLink Deprecated	protected	function	Passes if a link with the specified label is found.
AssertLegacyTrait::assertLinkByHref Deprecated	protected	function	Passes if a link containing a given href (part) is found.
AssertLegacyTrait::assertNoCacheTag Deprecated	protected	function	Asserts whether an expected cache tag was absent in the last response.
AssertLegacyTrait::assertNoEscaped Deprecated	protected	function	Passes if the raw text is not found escaped on the loaded page.
AssertLegacyTrait::assertNoField Deprecated	protected	function	Asserts that a field does NOT exist with the given name or ID.
AssertLegacyTrait::assertNoFieldById Deprecated	protected	function	Asserts that a field does not exist with the given ID and value.
AssertLegacyTrait::assertNoFieldByName Deprecated	protected	function	Asserts that a field does not exist with the given name and value.
AssertLegacyTrait::assertNoFieldByXPath Deprecated	protected	function	Asserts that a field does not exist or its value does not match, by XPath.
AssertLegacyTrait::assertNoFieldChecked Deprecated	protected	function	Asserts that a checkbox field in the current page is not checked.
AssertLegacyTrait::assertNoLink Deprecated	protected	function	Passes if a link with the specified label is not found.
AssertLegacyTrait::assertNoLinkByHref Deprecated	protected	function	Passes if a link containing a given href (part) is not found.
AssertLegacyTrait::assertNoOption Deprecated	protected	function	Asserts that a select option does NOT exist in the current page.
AssertLegacyTrait::assertNoPattern Deprecated	protected	function	Triggers a pass if the Perl regex pattern is not found in the raw content.
AssertLegacyTrait::assertNoRaw Deprecated	protected	function	Passes if the raw text IS not found on the loaded page, fail otherwise.
AssertLegacyTrait::assertNotEqual Deprecated	protected	function
AssertLegacyTrait::assertNoText Deprecated	protected	function	Passes if the page (with HTML stripped) does not contains the text.
AssertLegacyTrait::assertNotIdentical Deprecated	protected	function
AssertLegacyTrait::assertNoUniqueText Deprecated	protected	function	Passes if the text is found MORE THAN ONCE on the text version of the page.
AssertLegacyTrait::assertOption Deprecated	protected	function	Asserts that a select option in the current page exists.
AssertLegacyTrait::assertOptionByText Deprecated	protected	function	Asserts that a select option with the visible text exists.
AssertLegacyTrait::assertOptionSelected Deprecated	protected	function	Asserts that a select option in the current page is checked.
AssertLegacyTrait::assertPattern Deprecated	protected	function	Triggers a pass if the Perl regex pattern is found in the raw content.
AssertLegacyTrait::assertRaw Deprecated	protected	function	Passes if the raw text IS found on the loaded page, fail otherwise.
AssertLegacyTrait::assertResponse Deprecated	protected	function	Asserts the page responds with the specified response code.
AssertLegacyTrait::assertText Deprecated	protected	function	Passes if the page (with HTML stripped) contains the text.
AssertLegacyTrait::assertTextHelper Deprecated	protected	function	Helper for assertText and assertNoText.
AssertLegacyTrait::assertTitle Deprecated	protected	function	Pass if the page title is the given string.
AssertLegacyTrait::assertUniqueText Deprecated	protected	function	Passes if the text is found ONLY ONCE on the text version of the page.
AssertLegacyTrait::assertUrl Deprecated	protected	function	Passes if the internal browser's URL matches the given path.
AssertLegacyTrait::buildXPathQuery Deprecated	protected	function	Builds an XPath query.
AssertLegacyTrait::constructFieldXpath Deprecated	protected	function	Helper: Constructs an XPath for the given set of attributes and value.
AssertLegacyTrait::getAllOptions Deprecated	protected	function	Get all option elements, including nested options, in a select.
AssertLegacyTrait::getRawContent Deprecated	protected	function	Gets the current raw content.
AssertLegacyTrait::pass Deprecated	protected	function
AssertLegacyTrait::verbose Deprecated	protected	function
BigPipeTest::$defaultTheme	protected	property	The theme to install as the default for testing. Overrides BrowserTestBase::$defaultTheme
BigPipeTest::$dumpHeaders	protected	property
BigPipeTest::$modules	protected static	property	Modules to enable. Overrides BrowserTestBase::$modules
BigPipeTest::assertBigPipeNoJsCookieExists	protected	function	Asserts whether a BigPipe no-JS cookie exists or not.
BigPipeTest::assertBigPipeNoJsMetaRefreshRedirect	protected	function	Calls ::performMetaRefresh() and asserts the responses.
BigPipeTest::assertBigPipeNoJsPlaceholders	protected	function	Asserts expected BigPipe no-JS placeholders are present and replaced.
BigPipeTest::assertBigPipePlaceholders	protected	function	Asserts expected BigPipe placeholders are present and replaced.
BigPipeTest::assertBigPipeResponseHeadersPresent	protected	function
BigPipeTest::assertCookieExists	protected	function	Asserts whether a cookie exists on the client or not.
BigPipeTest::assertSessionCookieExists	protected	function	Asserts whether a session cookie exists or not.
BigPipeTest::assertSetsEqual	protected	function	Asserts whether arrays A and B are equal, when treated as sets.
BigPipeTest::getTestCases	protected	function
BigPipeTest::performMetaRefresh	protected	function	Performs a single <meta> refresh explicitly.
BigPipeTest::setCsrfTokenSeedInTestEnvironment	protected	function	Ensures CSRF tokens can be generated for the current user's session.
BigPipeTest::setUp	protected	function	Overrides BrowserTestBase::setUp
BigPipeTest::testBigPipe	public	function	Tests BigPipe-delivered HTML responses when JavaScript is enabled.
BigPipeTest::testBigPipeMultiOccurrencePlaceholders	public	function	Tests BigPipe with a multi-occurrence placeholder.
BigPipeTest::testBigPipeNoJs	public	function	Tests BigPipe-delivered HTML responses when JavaScript is disabled.
BigPipeTest::testNoJsDetection	public	function	Tests BigPipe's no-JS detection.
BlockCreationTrait::placeBlock	protected	function	Creates a block instance based on default settings. Aliased as: drupalPlaceBlock
BrowserHtmlDebugTrait::$htmlOutputBaseUrl	protected	property	The Base URI to use for links to the output files.
BrowserHtmlDebugTrait::$htmlOutputClassName	protected	property	Class name for HTML output logging.
BrowserHtmlDebugTrait::$htmlOutputCounter	protected	property	Counter for HTML output logging.
BrowserHtmlDebugTrait::$htmlOutputCounterStorage	protected	property	Counter storage for HTML output logging.
BrowserHtmlDebugTrait::$htmlOutputDirectory	protected	property	Directory name for HTML output logging.
BrowserHtmlDebugTrait::$htmlOutputEnabled	protected	property	HTML output output enabled.
BrowserHtmlDebugTrait::$htmlOutputFile	protected	property	The file name to write the list of URLs to.
BrowserHtmlDebugTrait::$htmlOutputTestId	protected	property	HTML output test ID.
BrowserHtmlDebugTrait::formatHtmlOutputHeaders	protected	function	Formats HTTP headers as string for HTML output logging.
BrowserHtmlDebugTrait::getHtmlOutputHeaders	protected	function	Returns headers in HTML output format.	1
BrowserHtmlDebugTrait::getResponseLogHandler	protected	function	Provides a Guzzle middleware handler to log every response received.
BrowserHtmlDebugTrait::htmlOutput	protected	function	Logs a HTML output message in a text file.
BrowserHtmlDebugTrait::initBrowserOutputFile	protected	function	Creates the directory to store browser output.
BrowserTestBase::$baseUrl	protected	property	The base URL.
BrowserTestBase::$configImporter	protected	property	The config importer that can be used in a test.
BrowserTestBase::$customTranslations	protected	property	An array of custom translations suitable for drupal_rewrite_settings().
BrowserTestBase::$databasePrefix	protected	property	The database prefix of this test run.
BrowserTestBase::$mink	protected	property	Mink session manager.
BrowserTestBase::$minkDefaultDriverArgs	protected	property	Mink default driver params.
BrowserTestBase::$minkDefaultDriverClass	protected	property	Mink class for the default driver to use.	1
BrowserTestBase::$originalContainer	protected	property	The original container.
BrowserTestBase::$originalShutdownCallbacks	protected	property	The original array of shutdown function callbacks.
BrowserTestBase::$preserveGlobalState	protected	property
BrowserTestBase::$profile	protected	property	The profile to install as a basis for testing.	39
BrowserTestBase::$root	protected	property	The app root.
BrowserTestBase::$runTestInSeparateProcess	protected	property	Browser tests are run in separate processes to prevent collisions between code that may be loaded by tests.
BrowserTestBase::$timeLimit	protected	property	Time limit in seconds for the test.
BrowserTestBase::$translationFilesDirectory	protected	property	The translation file directory for the test environment.
BrowserTestBase::cleanupEnvironment	protected	function	Clean up the Simpletest environment.
BrowserTestBase::config	protected	function	Configuration accessor for tests. Returns non-overridden configuration.
BrowserTestBase::drupalGetHeader Deprecated	protected	function	Gets the value of an HTTP response header.
BrowserTestBase::filePreDeleteCallback	public static	function	Ensures test files are deletable.
BrowserTestBase::getDefaultDriverInstance	protected	function	Gets an instance of the default Mink driver.
BrowserTestBase::getDrupalSettings	protected	function	Gets the JavaScript drupalSettings variable for the currently-loaded page.	1
BrowserTestBase::getHttpClient	protected	function	Obtain the HTTP client for the system under test.
BrowserTestBase::getMinkDriverArgs	protected	function	Get the Mink driver args from an environment variable, if it is set. Can be overridden in a derived class so it is possible to use a different value for a subset of tests, e.g. the JavaScript tests.	1
BrowserTestBase::getOptions	protected	function	Helper function to get the options of select field.
BrowserTestBase::getSession	public	function	Returns Mink session.
BrowserTestBase::getSessionCookies	protected	function	Get session cookies from current session.
BrowserTestBase::getTestMethodCaller	protected	function	Retrieves the current calling line in the class under test. Overrides BrowserHtmlDebugTrait::getTestMethodCaller
BrowserTestBase::initFrontPage	protected	function	Visits the front page when initializing Mink.	3
BrowserTestBase::initMink	protected	function	Initializes Mink sessions.	1
BrowserTestBase::installDrupal	public	function	Installs Drupal into the Simpletest site.	1
BrowserTestBase::registerSessions	protected	function	Registers additional Mink sessions.
BrowserTestBase::setUpAppRoot	protected	function	Sets up the root application path.
BrowserTestBase::setUpBeforeClass	public static	function		1
BrowserTestBase::tearDown	protected	function		3
BrowserTestBase::translatePostValues	protected	function	Transforms a nested array into a flat array suitable for submitForm().
BrowserTestBase::xpath	protected	function	Performs an xpath search on the contents of the internal browser.
BrowserTestBase::__sleep	public	function	Prevents serializing any properties.
ConfigTestTrait::configImporter	protected	function	Returns a ConfigImporter object to import test configuration.
ConfigTestTrait::copyConfig	protected	function	Copies configuration objects from source storage to target storage.
ContentTypeCreationTrait::createContentType	protected	function	Creates a custom content type based on default settings. Aliased as: drupalCreateContentType	1
ExtensionListTestTrait::getModulePath	protected	function	Gets the path for the specified module.
ExtensionListTestTrait::getThemePath	protected	function	Gets the path for the specified theme.
FunctionalTestSetupTrait::$apcuEnsureUniquePrefix	protected	property	The flag to set 'apcu_ensure_unique_prefix' setting.	1
FunctionalTestSetupTrait::$classLoader	protected	property	The class loader to use for installation and initialization of setup.
FunctionalTestSetupTrait::$rootUser	protected	property	The "#1" admin user.
FunctionalTestSetupTrait::doInstall	protected	function	Execute the non-interactive installer.	1
FunctionalTestSetupTrait::getDatabaseTypes	protected	function	Returns all supported database driver installer objects.
FunctionalTestSetupTrait::initConfig	protected	function	Initialize various configurations post-installation.	1
FunctionalTestSetupTrait::initKernel	protected	function	Initializes the kernel after installation.
FunctionalTestSetupTrait::initSettings	protected	function	Initialize settings created during install.
FunctionalTestSetupTrait::initUserSession	protected	function	Initializes user 1 for the site to be installed.
FunctionalTestSetupTrait::installDefaultThemeFromClassProperty	protected	function	Installs the default theme defined by `static::$defaultTheme` when needed.
FunctionalTestSetupTrait::installModulesFromClassProperty	protected	function	Install modules defined by `static::$modules`.	1
FunctionalTestSetupTrait::installParameters	protected	function	Returns the parameters that will be used when Simpletest installs Drupal.	9
FunctionalTestSetupTrait::prepareEnvironment	protected	function	Prepares the current environment for running the test.	20
FunctionalTestSetupTrait::prepareRequestForGenerator	protected	function	Creates a mock request and sets it on the generator.
FunctionalTestSetupTrait::prepareSettings	protected	function	Prepares site settings and services before installation.	2
FunctionalTestSetupTrait::rebuildAll	protected	function	Resets and rebuilds the environment after setup.
FunctionalTestSetupTrait::rebuildContainer	protected	function	Rebuilds \Drupal::getContainer().
FunctionalTestSetupTrait::resetAll	protected	function	Resets all data structures after having enabled new modules.
FunctionalTestSetupTrait::setContainerParameter	protected	function	Changes parameters in the services.yml file.
FunctionalTestSetupTrait::setupBaseUrl	protected	function	Sets up the base URL based upon the environment variable.
FunctionalTestSetupTrait::writeSettings	protected	function	Rewrites the settings.php file of the test site.	1
NodeCreationTrait::createNode	protected	function	Creates a node based on default settings. Aliased as: drupalCreateNode
NodeCreationTrait::getNodeByTitle	public	function	Get a node from the database based on its title. Aliased as: drupalGetNodeByTitle
PhpUnitWarnings::$deprecationWarnings	private static	property	Deprecation warnings from PHPUnit to raise with @trigger_error().
PhpUnitWarnings::addWarning	public	function	Converts PHPUnit deprecation warnings to E_USER_DEPRECATED.
RandomGeneratorTrait::$randomGenerator	protected	property	The random generator.
RandomGeneratorTrait::getRandomGenerator	protected	function	Gets the random generator for the utility methods.
RandomGeneratorTrait::randomMachineName	protected	function	Generates a unique random string containing letters and numbers.	1
RandomGeneratorTrait::randomObject	public	function	Generates a random PHP object.
RandomGeneratorTrait::randomString	public	function	Generates a pseudo-random string of ASCII characters of codes 32 to 126.
RandomGeneratorTrait::randomStringValidate	public	function	Callback for random string validation.
RefreshVariablesTrait::refreshVariables	protected	function	Refreshes in-memory configuration and state information.	1
SessionTestTrait::$sessionName	protected	property	The name of the session cookie.
SessionTestTrait::generateSessionName	protected	function	Generates a session cookie name.
SessionTestTrait::getSessionName	protected	function	Returns the session name in use on the child site.
StorageCopyTrait::replaceStorageContents	protected static	function	Copy the configuration from one storage to another and remove stale items.
TestRequirementsTrait::checkModuleRequirements	private	function	Checks missing module requirements.
TestRequirementsTrait::checkRequirements	protected	function	Check module requirements for the Drupal use case.	1
TestRequirementsTrait::getDrupalRoot	protected static	function	Returns the Drupal root directory.
TestSetupTrait::$configSchemaCheckerExclusions	protected static	property	An array of config object names that are excluded from schema checking.
TestSetupTrait::$container	protected	property	The dependency injection container used in the test.
TestSetupTrait::$kernel	protected	property	The DrupalKernel instance used in the test.
TestSetupTrait::$originalSite	protected	property	The site directory of the original parent site.
TestSetupTrait::$privateFilesDirectory	protected	property	The private file directory for the test environment.
TestSetupTrait::$publicFilesDirectory	protected	property	The public file directory for the test environment.
TestSetupTrait::$siteDirectory	protected	property	The site directory of this test run.
TestSetupTrait::$strictConfigSchema	protected	property	Set to TRUE to strict check all configuration saved.	1
TestSetupTrait::$tempFilesDirectory	protected	property	The temporary file directory for the test environment.
TestSetupTrait::$testId	protected	property	The test run ID.
TestSetupTrait::changeDatabasePrefix	protected	function	Changes the database connection to the prefixed one.
TestSetupTrait::getConfigSchemaExclusions	protected	function	Gets the config schema exclusions for this test.
TestSetupTrait::getDatabaseConnection	public static	function	Returns the database connection to the site running Simpletest.
TestSetupTrait::prepareDatabasePrefix	protected	function	Generates a database prefix for running tests.	1
UiHelperTrait::$loggedInUser	protected	property	The current user logged in using the Mink controlled browser.
UiHelperTrait::$maximumMetaRefreshCount	protected	property	The number of meta refresh redirects to follow, or NULL if unlimited.
UiHelperTrait::$metaRefreshCount	protected	property	The number of meta refresh redirects followed during ::drupalGet().
UiHelperTrait::assertSession	public	function	Returns WebAssert object.	1
UiHelperTrait::buildUrl	protected	function	Builds an absolute URL from a system path or a URL object.
UiHelperTrait::checkForMetaRefresh	protected	function	Checks for meta refresh tag and if found call drupalGet() recursively.
UiHelperTrait::click	protected	function	Clicks the element with the given CSS selector.
UiHelperTrait::clickLink	protected	function	Follows a link by complete name.
UiHelperTrait::cssSelect	protected	function	Searches elements using a CSS selector in the raw content.
UiHelperTrait::cssSelectToXpath	protected	function	Translates a CSS expression to its XPath equivalent.
UiHelperTrait::drupalGet	protected	function	Retrieves a Drupal path or an absolute path.	2
UiHelperTrait::drupalLogin	protected	function	Logs in a user using the Mink controlled browser.
UiHelperTrait::drupalLogout	protected	function	Logs a user out of the Mink controlled browser and confirms.
UiHelperTrait::drupalPostForm Deprecated	protected	function	Executes a form submission.
UiHelperTrait::drupalUserIsLoggedIn	protected	function	Returns whether a given user account is logged in.
UiHelperTrait::getAbsoluteUrl	protected	function	Takes a path and returns an absolute path.
UiHelperTrait::getTextContent	protected	function	Retrieves the plain-text content from the current page.
UiHelperTrait::getUrl	protected	function	Get the current URL from the browser.
UiHelperTrait::isTestUsingGuzzleClient	protected	function	Determines if test is using DrupalTestBrowser.
UiHelperTrait::prepareRequest	protected	function	Prepare for a request to testing site.	1
UiHelperTrait::submitForm	protected	function	Fills and submits a form.
UserCreationTrait::checkPermissions	protected	function	Checks whether a given list of permission names is valid.
UserCreationTrait::createAdminRole	protected	function	Creates an administrative role.
UserCreationTrait::createRole	protected	function	Creates a role with specified permissions. Aliased as: drupalCreateRole
UserCreationTrait::createUser	protected	function	Create a user with a given set of permissions. Aliased as: drupalCreateUser
UserCreationTrait::grantPermissions	protected	function	Grant permissions to a user role.
UserCreationTrait::setCurrentUser	protected	function	Switch the current logged in user.
UserCreationTrait::setUpCurrentUser	protected	function	Creates a random user account and sets it as current user.
XdebugRequestTrait::extractCookiesFromRequest	protected	function	Adds xdebug cookies, from request setup.

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class BigPipeTest in Drupal 9

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