| Server IP : 134.29.175.74 / Your IP : 216.73.216.160 Web Server : nginx/1.10.2 System : Windows NT CST-WEBSERVER 10.0 build 19045 (Windows 10) i586 User : Administrator ( 0) PHP Version : 7.1.0 Disable Function : NONE MySQL : OFF | cURL : ON | WGET : OFF | Perl : OFF | Python : OFF | Sudo : OFF | Pkexec : OFF Directory : C:/nginx/html/Student/JimMartinson/Lab12/drupal/core/modules/big_pipe/src/Tests/ |
Upload File : |
<?php
namespace Drupal\big_pipe\Tests;
use Drupal\big_pipe\Render\Placeholder\BigPipeStrategy;
use Drupal\big_pipe\Render\BigPipe;
use Drupal\Component\Serialization\Json;
use Drupal\Component\Utility\Html;
use Drupal\Core\Logger\RfcLogLevel;
use Drupal\Core\Url;
use Drupal\simpletest\WebTestBase;
/**
* Tests BigPipe's no-JS detection & response delivery (with and without JS).
*
* Covers:
* - big_pipe_page_attachments()
* - \Drupal\big_pipe\Controller\BigPipeController
* - \Drupal\big_pipe\EventSubscriber\HtmlResponseBigPipeSubscriber
* - \Drupal\big_pipe\Render\BigPipe
*
* @group big_pipe
*/
class BigPipeTest extends WebTestBase {
/**
* Modules to enable.
*
* @var array
*/
public static $modules = ['big_pipe', 'big_pipe_test', 'dblog'];
/**
* {@inheritdoc}
*/
protected $dumpHeaders = TRUE;
/**
* {@inheritdoc}
*/
protected function setUp() {
parent::setUp();
// Ignore the <meta> refresh that big_pipe.module sets. It causes a redirect
// to a page that sets another cookie, which causes WebTestBase 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->assertNoRaw('<noscript><meta http-equiv="Refresh" content="0; URL=');
$this->assertNoRaw($no_js_to_js_markup);
// 2. Session (authenticated).
$this->drupalLogin($this->rootUser);
$this->assertSessionCookieExists(TRUE);
$this->assertBigPipeNoJsCookieExists(FALSE);
$this->assertRaw('<noscript><meta http-equiv="Refresh" content="0; URL=' . base_path() . 'big_pipe/no-js?destination=' . base_path() . 'user/1" />' . "\n" . '</noscript>');
$this->assertNoRaw($no_js_to_js_markup);
$this->assertBigPipeNoJsMetaRefreshRedirect();
$this->assertBigPipeNoJsCookieExists(TRUE);
$this->assertNoRaw('<noscript><meta http-equiv="Refresh" content="0; URL=');
$this->assertRaw($no_js_to_js_markup);
$this->drupalLogout();
// Close the prior connection and remove the collected state.
$this->curlClose();
$this->curlCookies = [];
$this->cookies = [];
// 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->assertRaw('<noscript><meta http-equiv="Refresh" content="0; URL=' . base_path() . 'big_pipe/no-js?destination=' . base_path() . 'user/login" />' . "\n" . '</noscript>');
$this->assertNoRaw($no_js_to_js_markup);
$this->assertBigPipeNoJsMetaRefreshRedirect();
$this->assertBigPipeNoJsCookieExists(TRUE);
$this->assertNoRaw('<noscript><meta http-equiv="Refresh" content="0; URL=');
$this->assertRaw($no_js_to_js_markup);
// Close the prior connection and remove the collected state.
$this->curlClose();
$this->curlCookies = [];
$this->cookies = [];
// Edge case: route with '_no_big_pipe' option.
$this->drupalGet(Url::fromRoute('no_big_pipe'));
$this->assertSessionCookieExists(FALSE);
$this->assertBigPipeNoJsCookieExists(FALSE);
$this->assertNoRaw('<noscript><meta http-equiv="Refresh" content="0; URL=');
$this->assertNoRaw($no_js_to_js_markup);
$this->drupalLogin($this->rootUser);
$this->drupalGet(Url::fromRoute('no_big_pipe'));
$this->assertSessionCookieExists(TRUE);
$this->assertBigPipeNoJsCookieExists(FALSE);
$this->assertNoRaw('<noscript><meta http-equiv="Refresh" content="0; URL=');
$this->assertNoRaw($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\Tests\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);
$log_count = db_query('SELECT COUNT(*) FROM {watchdog}')->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->assertNoCacheTag('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->assertRaw('</body>', 'Closing body tag present.');
$this->pass('Verifying BigPipe assets are present…', 'Debug');
$this->assertFalse(empty($this->getDrupalSettings()), 'drupalSettings present.');
$this->assertTrue(in_array('big_pipe/big_pipe', explode(',', $this->getDrupalSettings()['ajaxPageState']['libraries'])), 'BigPipe asset library is present.');
// Verify that the two expected exceptions are logged as errors.
$this->assertEqual($log_count + 2, db_query('SELECT COUNT(*) FROM {watchdog}')->fetchField(), 'Two new watchdog entries.');
$records = db_query('SELECT * FROM {watchdog} ORDER BY wid DESC LIMIT 2')->fetchAll();
$this->assertEqual(RfcLogLevel::ERROR, $records[0]->severity);
$this->assertTrue(FALSE !== strpos((string) unserialize($records[0]->variables)['@message'], 'Oh noes!'));
$this->assertEqual(RfcLogLevel::ERROR, $records[1]->severity);
$this->assertTrue(FALSE !== strpos((string) unserialize($records[1]->variables)['@message'], 'You are not allowed to say llamas are not cool!'));
// 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.
$this->pass('Verifying BigPipe provides useful error output when an error occurs while rendering a placeholder if verbose error logging is enabled.', 'Debug');
$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->assertRaw('The website encountered an unexpected error. Please try again later');
$this->assertRaw('You are not allowed to say llamas are not cool!');
$this->assertNoRaw(BigPipe::STOP_SIGNAL, 'BigPipe stop signal absent: error occurred before then.');
$this->assertNoRaw('</body>', 'Closing body tag absent: error occurred before then.');
// The exception is expected. Do not interpret it as a test failure.
unlink(\Drupal::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\Tests\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->assertNoCacheTag('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,
]);
$this->pass('Verifying there are no BigPipe placeholders & replacements…', 'Debug');
$this->assertEqual('<none>', $this->drupalGetHeader('BigPipe-Test-Placeholders'));
$this->pass('Verifying BigPipe start/stop signals are absent…', 'Debug');
$this->assertNoRaw(BigPipe::START_SIGNAL, 'BigPipe start signal absent.');
$this->assertNoRaw(BigPipe::STOP_SIGNAL, 'BigPipe stop signal absent.');
$this->pass('Verifying BigPipe assets are absent…', 'Debug');
$this->assertTrue(!isset($this->getDrupalSettings()['bigPipePlaceholderIds']) && empty($this->getDrupalSettings()['ajaxPageState']), 'BigPipe drupalSettings and BigPipe asset library absent.');
$this->assertRaw('</body>', 'Closing body tag present.');
// 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.
$this->pass('Verifying BigPipe provides useful error output when an error occurs while rendering a placeholder if verbose error logging is enabled.', 'Debug');
$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->assertRaw('The website encountered an unexpected error. Please try again later');
$this->assertRaw('You are not allowed to say llamas are not cool!');
$this->assertNoRaw('</body>', 'Closing body tag absent: error occurred before then.');
// The exception is expected. Do not interpret it as a test failure.
unlink(\Drupal::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&args[0]&token=_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA';
$expected_placeholder_replacement = '<script type="application/vnd.drupal-ajax" data-big-pipe-replacement-for-placeholder-with-id="' . $big_pipe_placeholder_id . '">';
$this->assertRaw('The count is 1.');
$this->assertNoRaw('The count is 2.');
$this->assertNoRaw('The count is 3.');
$raw_content = $this->getRawContent();
$this->assertTrue(substr_count($raw_content, $expected_placeholder_replacement) == 1, '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->assertRaw('The count is 1.');
$this->assertNoRaw('The count is 2.');
$this->assertNoRaw('The count is 3.');
}
protected function assertBigPipeResponseHeadersPresent() {
$this->pass('Verifying BigPipe response headers…', 'Debug');
$this->assertTrue(FALSE !== strpos($this->drupalGetHeader('Cache-Control'), 'private'), 'Cache-Control header set to "private".');
$this->assertEqual('no-store, content="BigPipe/1.0"', $this->drupalGetHeader('Surrogate-Control'));
$this->assertEqual('no', $this->drupalGetHeader('X-Accel-Buffering'));
}
/**
* 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->pass('Verifying BigPipe no-JS placeholders & replacements…', 'Debug');
$this->assertSetsEqual(array_keys($expected_big_pipe_nojs_placeholders), array_map('rawurldecode', explode(' ', $this->drupalGetHeader('BigPipe-Test-No-Js-Placeholders'))));
foreach ($expected_big_pipe_nojs_placeholders as $big_pipe_nojs_placeholder => $expected_replacement) {
$this->pass('Checking whether the replacement for the BigPipe no-JS placeholder "' . $big_pipe_nojs_placeholder . '" is present:');
$this->assertNoRaw($big_pipe_nojs_placeholder);
if ($expected_replacement !== NULL) {
$this->assertRaw($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->pass('Verifying BigPipe placeholders & replacements…', 'Debug');
$this->assertSetsEqual(array_keys($expected_big_pipe_placeholders), explode(' ', $this->drupalGetHeader('BigPipe-Test-Placeholders')));
$placeholder_positions = [];
$placeholder_replacement_positions = [];
foreach ($expected_big_pipe_placeholders as $big_pipe_placeholder_id => $expected_ajax_response) {
$this->pass('BigPipe placeholder: ' . $big_pipe_placeholder_id, 'Debug');
// Verify expected placeholder.
$expected_placeholder_html = '<span data-big-pipe-placeholder-id="' . $big_pipe_placeholder_id . '"></span>';
$this->assertRaw($expected_placeholder_html, 'BigPipe placeholder for placeholder ID "' . $big_pipe_placeholder_id . '" found.');
$pos = strpos($this->getRawContent(), $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) {
$this->assertEqual(0, count($result));
$this->assertNoRaw($expected_placeholder_replacement);
continue;
}
$this->assertEqual($expected_ajax_response, trim((string) $result[0]));
$this->assertRaw($expected_placeholder_replacement);
$pos = strpos($this->getRawContent(), $expected_placeholder_replacement);
$placeholder_replacement_positions[$pos] = $big_pipe_placeholder_id;
}
ksort($placeholder_positions, SORT_NUMERIC);
$this->assertEqual(array_keys($expected_big_pipe_placeholders), array_values($placeholder_positions));
$placeholders = array_map(function(\SimpleXMLElement $element) { return (string) $element['data-big-pipe-placeholder-id']; }, $this->cssSelect('[data-big-pipe-placeholder-id]'));
$this->assertEqual(count($expected_big_pipe_placeholders), count(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];
}
$this->assertEqual($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));
$this->assertEqual(count($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->getRawContent()));
$this->pass('Verifying BigPipe start/stop signals…', 'Debug');
$this->assertRaw(BigPipe::START_SIGNAL, 'BigPipe start signal present.');
$this->assertRaw(BigPipe::STOP_SIGNAL, 'BigPipe stop signal present.');
$start_signal_position = strpos($this->getRawContent(), BigPipe::START_SIGNAL);
$stop_signal_position = strpos($this->getRawContent(), BigPipe::STOP_SIGNAL);
$this->assertTrue($start_signal_position < $stop_signal_position, 'BigPipe start signal appears before stop signal.');
$this->pass('Verifying BigPipe placeholder replacements and start/stop signals were streamed in the correct order…', 'Debug');
$expected_stream_order = array_keys($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);
$this->assertEqual($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->cookies[$this->getSessionName()]['value']);
$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\Tests\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) {
$non_deleted_cookies = array_filter($this->cookies, function ($item) { return $item['value'] !== 'deleted'; });
$this->assertEqual($expected, isset($non_deleted_cookies[$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->url;
$this->performMetaRefresh();
$this->assertEqual($original_url, $this->url, 'Redirected back to the original location.');
$headers = $this->drupalGetHeaders(TRUE);
$this->assertEqual(2, count($headers), 'Two requests were made upon following the <meta> refresh, there are headers for two responses.');
// First response: redirect.
$this->assertEqual('HTTP/1.1 302 Found', $headers[0][':status'], 'The first response was a 302 (redirect).');
$this->assertIdentical(0, strpos($headers[0]['set-cookie'], 'big_pipe_nojs=1'), 'The first response sets the big_pipe_nojs cookie.');
$this->assertEqual($original_url, $headers[0]['location'], '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']))), '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->assertEqual('HTTP/1.1 200 OK', $headers[1][':status'], 'The second response was a 200.');
$this->assertTrue(empty(array_diff(['cookies:big_pipe_nojs', 'session.exists'], explode(' ', $headers[0]['x-drupal-cache-contexts']))), 'The first response varies by the "cookies:big_pipe_nojs" and "session.exists" cache contexts.');
$this->assertEqual('no-store, content="BigPipe/1.0"', $headers[1]['surrogate-control'], 'The second response has a "Surrogate-Control" header.');
$this->assertNoRaw('<noscript><meta http-equiv="Refresh" content="0; URL=', 'Once the BigPipe no-JS cookie is set, the <meta> refresh is absent: only one redirect ever happens.');
}
}