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LinkHeaderTest.php in HTTP/2 Server Push 8

Namespace

Drupal\Tests\http2_server_push\Functional

File

tests/src/Functional/LinkHeaderTest.php
View source 
<?php

namespace Drupal\Tests\http2_server_push\Functional;

use Drupal\Component\Utility\Html;
use Drupal\Tests\BrowserTestBase;
use Drupal\user\Entity\Role;
use Drupal\user\RoleInterface;

/**
 * @group http2_server_push
 */
class LinkHeaderTest extends BrowserTestBase {

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

  /**
   * {@inheritdoc}
   */
  public static $modules = [
    'toolbar',
    'http2_server_push',
  ];

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

    // Grant anonymous users access to the toolbar, so the anonymous user gets
    // some JavaScript.
    $this
      ->grantPermissions(Role::load(RoleInterface::ANONYMOUS_ID), [
      'access toolbar',
    ]);
  }
  public function testCssJsLinkHeaders() {
    $session = $this
      ->getSession();

    // No Server Push Link response headers should be present when CSS and JS
    // aggregation are disabled.
    $this
      ->drupalGet('<front>');
    $this
      ->assertNull($session
      ->getResponseHeader('Link'));

    // \Drupal\Tests\BrowserTestBase::installDrupal() overrides some of the
    // defaults for easier test debugging. But for a CDN integration test, we do
    // want the defaults to be applied, because that is what we want to test.
    $this
      ->config('system.performance')
      ->set('css.preprocess', TRUE)
      ->set('js.preprocess', TRUE)
      ->save();
    $html = $this
      ->drupalGet('<front>');

    // Determine the expected link response headers.
    $expected_link_response_headers = [];
    $document = Html::load($html);
    $xpath = new \DOMXPath($document);
    $dom_nodes = $xpath
      ->query('//link[@rel="stylesheet"]');
    foreach ($dom_nodes as $dom_node) {
      $expected_link_response_headers[] = '<' . $dom_node
        ->getAttribute('href') . '>; rel=preload; as=style';
    }
    $dom_nodes = $xpath
      ->query('//script[@src]');
    foreach ($dom_nodes as $dom_node) {
      $expected_link_response_headers[] = '<' . $dom_node
        ->getAttribute('src') . '>; rel=preload; as=script';
    }

    // Assert that the expected Server Push Link response headers are present.
    $this
      ->assertSame($expected_link_response_headers, $session
      ->getResponseHeaders()['Link']);

    // @todo test more explicitly that browser-conditional CSS and JS does not get a Server Push Link header. This is a bit difficult because DOMXPath automatically ignores this HTML.
    $conditional_script_html = <<<HTML
<!--[if lte IE 8]>
<script
HTML;
    $this
      ->assertSession()
      ->responseContains($conditional_script_html);
  }

}

Classes

Namesort descending Description
LinkHeaderTest @group http2_server_push