PageCacheTest.php in Zircon Profile 8

Contains \Drupal\page_cache\Tests\PageCacheTest.

Namespace

Drupal\page_cache\Tests

File

core/modules/page_cache/src/Tests/PageCacheTest.php

<?php

/**
 * @file
 * Contains \Drupal\page_cache\Tests\PageCacheTest.
 */
namespace Drupal\page_cache\Tests;

use Drupal\Component\Datetime\DateTimePlus;
use Drupal\Core\Url;
use Drupal\entity_test\Entity\EntityTest;
use Drupal\simpletest\WebTestBase;
use Drupal\Core\Cache\Cache;
use Drupal\user\Entity\Role;
use Drupal\user\RoleInterface;

/**
 * Enables the page cache and tests it with various HTTP requests.
 *
 * @group page_cache
 */
class PageCacheTest extends WebTestBase {
  protected $dumpHeaders = TRUE;

  /**
   * Modules to enable.
   *
   * @var array
   */
  public static $modules = array(
    'test_page_test',
    'system_test',
    'entity_test',
  );

  /**
   * {@inheritdoc}
   */
  protected function setUp() {
    parent::setUp();
    $this
      ->config('system.site')
      ->set('name', 'Drupal')
      ->set('page.front', '/test-page')
      ->save();
  }

  /**
   * Test that cache tags are properly persisted.
   *
   * Since tag based invalidation works, we know that our tag properly
   * persisted.
   */
  function testPageCacheTags() {
    $config = $this
      ->config('system.performance');
    $config
      ->set('cache.page.max_age', 300);
    $config
      ->save();
    $path = 'system-test/cache_tags_page';
    $tags = array(
      'system_test_cache_tags_page',
    );
    $this
      ->drupalGet($path);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'MISS');

    // Verify a cache hit, but also the presence of the correct cache tags.
    $this
      ->drupalGet($path);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'HIT');
    $cid_parts = array(
      \Drupal::url('system_test.cache_tags_page', array(), array(
        'absolute' => TRUE,
      )),
      'html',
    );
    $cid = implode(':', $cid_parts);
    $cache_entry = \Drupal::cache('render')
      ->get($cid);
    sort($cache_entry->tags);
    $expected_tags = array(
      'config:user.role.anonymous',
      'pre_render',
      'rendered',
      'system_test_cache_tags_page',
    );
    $this
      ->assertIdentical($cache_entry->tags, $expected_tags);
    Cache::invalidateTags($tags);
    $this
      ->drupalGet($path);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'MISS');
  }

  /**
   * Test that the page cache doesn't depend on cacheability headers.
   */
  function testPageCacheTagsIndependentFromCacheabilityHeaders() {
    $this
      ->setHttpResponseDebugCacheabilityHeaders(FALSE);
    $path = 'system-test/cache_tags_page';
    $tags = array(
      'system_test_cache_tags_page',
    );
    $this
      ->drupalGet($path);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'MISS');

    // Verify a cache hit, but also the presence of the correct cache tags.
    $this
      ->drupalGet($path);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'HIT');
    $cid_parts = array(
      \Drupal::url('system_test.cache_tags_page', array(), array(
        'absolute' => TRUE,
      )),
      'html',
    );
    $cid = implode(':', $cid_parts);
    $cache_entry = \Drupal::cache('render')
      ->get($cid);
    sort($cache_entry->tags);
    $expected_tags = array(
      'config:user.role.anonymous',
      'pre_render',
      'rendered',
      'system_test_cache_tags_page',
    );
    $this
      ->assertIdentical($cache_entry->tags, $expected_tags);
    Cache::invalidateTags($tags);
    $this
      ->drupalGet($path);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'MISS');
  }

  /**
   * Tests support for different cache items with different request formats
   * specified via a query parameter.
   */
  function testQueryParameterFormatRequests() {
    $config = $this
      ->config('system.performance');
    $config
      ->set('cache.page.max_age', 300);
    $config
      ->save();
    $accept_header_cache_url = Url::fromRoute('system_test.page_cache_accept_header');
    $accept_header_cache_url_with_json = Url::fromRoute('system_test.page_cache_accept_header', [
      '_format' => 'json',
    ]);
    $this
      ->drupalGet($accept_header_cache_url);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'MISS', 'HTML page was not yet cached.');
    $this
      ->drupalGet($accept_header_cache_url);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'HTML page was cached.');
    $this
      ->assertRaw('<p>oh hai this is html.</p>', 'The correct HTML response was returned.');
    $this
      ->drupalGet($accept_header_cache_url_with_json);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'MISS', 'Json response was not yet cached.');
    $this
      ->drupalGet($accept_header_cache_url_with_json);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Json response was cached.');
    $this
      ->assertRaw('{"content":"oh hai this is json"}', 'The correct Json response was returned.');

    // Enable REST support for nodes and hal+json.
    \Drupal::service('module_installer')
      ->install([
      'node',
      'rest',
      'hal',
    ]);
    $this
      ->drupalCreateContentType([
      'type' => 'article',
    ]);
    $node = $this
      ->drupalCreateNode([
      'type' => 'article',
    ]);
    $node_uri = $node
      ->urlInfo();
    $node_url_with_hal_json_format = $node
      ->urlInfo('canonical')
      ->setRouteParameter('_format', 'hal_json');

    /** @var \Drupal\user\RoleInterface $role */
    $role = Role::load('anonymous');
    $role
      ->grantPermission('restful get entity:node');
    $role
      ->save();
    $this
      ->drupalGet($node_uri);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'MISS');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Content-Type'), 'text/html; charset=UTF-8');
    $this
      ->drupalGet($node_uri);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'HIT');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Content-Type'), 'text/html; charset=UTF-8');

    // Now request a HAL page, we expect that the first request is a cache miss
    // and it serves HTML.
    $this
      ->drupalGet($node_url_with_hal_json_format);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'MISS');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Content-Type'), 'application/hal+json');
    $this
      ->drupalGet($node_url_with_hal_json_format);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'HIT');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Content-Type'), 'application/hal+json');

    // Clear the page cache. After that request a HAL request, followed by an
    // ordinary HTML one.
    \Drupal::cache('render')
      ->deleteAll();
    $this
      ->drupalGet($node_url_with_hal_json_format);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'MISS');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Content-Type'), 'application/hal+json');
    $this
      ->drupalGet($node_url_with_hal_json_format);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'HIT');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Content-Type'), 'application/hal+json');
    $this
      ->drupalGet($node_uri);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'MISS');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Content-Type'), 'text/html; charset=UTF-8');
    $this
      ->drupalGet($node_uri);
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'HIT');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Content-Type'), 'text/html; charset=UTF-8');
  }

  /**
   * Tests support of requests with If-Modified-Since and If-None-Match headers.
   */
  function testConditionalRequests() {
    $config = $this
      ->config('system.performance');
    $config
      ->set('cache.page.max_age', 300);
    $config
      ->save();

    // Fill the cache.
    $this
      ->drupalGet('');

    // Verify the page is not printed twice when the cache is cold.
    $this
      ->assertNoPattern('#<html.*<html#');
    $this
      ->drupalHead('');
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Page was cached.');
    $etag = $this
      ->drupalGetHeader('ETag');
    $last_modified = $this
      ->drupalGetHeader('Last-Modified');
    $this
      ->drupalGet('', array(), array(
      'If-Modified-Since: ' . $last_modified,
      'If-None-Match: ' . $etag,
    ));
    $this
      ->assertResponse(304, 'Conditional request returned 304 Not Modified.');
    $this
      ->drupalGet('', array(), array(
      'If-Modified-Since: ' . gmdate(DATE_RFC822, strtotime($last_modified)),
      'If-None-Match: ' . $etag,
    ));
    $this
      ->assertResponse(304, 'Conditional request with obsolete If-Modified-Since date returned 304 Not Modified.');
    $this
      ->drupalGet('', array(), array(
      'If-Modified-Since: ' . gmdate(DATE_RFC850, strtotime($last_modified)),
      'If-None-Match: ' . $etag,
    ));
    $this
      ->assertResponse(304, 'Conditional request with obsolete If-Modified-Since date returned 304 Not Modified.');
    $this
      ->drupalGet('', array(), array(
      'If-Modified-Since: ' . $last_modified,
    ));

    // Verify the page is not printed twice when the cache is warm.
    $this
      ->assertNoPattern('#<html.*<html#');
    $this
      ->assertResponse(200, 'Conditional request without If-None-Match returned 200 OK.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Page was cached.');
    $this
      ->drupalGet('', array(), array(
      'If-Modified-Since: ' . gmdate(DateTimePlus::RFC7231, strtotime($last_modified) + 1),
      'If-None-Match: ' . $etag,
    ));
    $this
      ->assertResponse(200, 'Conditional request with new a If-Modified-Since date newer than Last-Modified returned 200 OK.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Page was cached.');
    $user = $this
      ->drupalCreateUser();
    $this
      ->drupalLogin($user);
    $this
      ->drupalGet('', array(), array(
      'If-Modified-Since: ' . $last_modified,
      'If-None-Match: ' . $etag,
    ));
    $this
      ->assertResponse(200, 'Conditional request returned 200 OK for authenticated user.');
    $this
      ->assertFalse($this
      ->drupalGetHeader('X-Drupal-Cache'), 'Absence of Page was not cached.');
  }

  /**
   * Tests cache headers.
   */
  function testPageCache() {
    $config = $this
      ->config('system.performance');
    $config
      ->set('cache.page.max_age', 300);
    $config
      ->set('response.gzip', 1);
    $config
      ->save();

    // Fill the cache.
    $this
      ->drupalGet('system-test/set-header', array(
      'query' => array(
        'name' => 'Foo',
        'value' => 'bar',
      ),
    ));
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'MISS', 'Page was not cached.');
    $this
      ->assertEqual(strtolower($this
      ->drupalGetHeader('Vary')), 'cookie,accept-encoding', 'Vary header was sent.');

    // Symfony's Response logic determines a specific order for the subvalues
    // of the Cache-Control header, even if they are explicitly passed in to
    // the response header bag in a different order.
    $this
      ->assertEqual($this
      ->drupalGetHeader('Cache-Control'), 'max-age=300, public', 'Cache-Control header was sent.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Expires'), 'Sun, 19 Nov 1978 05:00:00 GMT', 'Expires header was sent.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Foo'), 'bar', 'Custom header was sent.');

    // Check cache.
    $this
      ->drupalGet('system-test/set-header', array(
      'query' => array(
        'name' => 'Foo',
        'value' => 'bar',
      ),
    ));
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Page was cached.');
    $this
      ->assertEqual(strtolower($this
      ->drupalGetHeader('Vary')), 'cookie,accept-encoding', 'Vary: Cookie header was sent.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Cache-Control'), 'max-age=300, public', 'Cache-Control header was sent.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Expires'), 'Sun, 19 Nov 1978 05:00:00 GMT', 'Expires header was sent.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Foo'), 'bar', 'Custom header was sent.');

    // Check replacing default headers.
    $this
      ->drupalGet('system-test/set-header', array(
      'query' => array(
        'name' => 'Expires',
        'value' => 'Fri, 19 Nov 2008 05:00:00 GMT',
      ),
    ));
    $this
      ->assertEqual($this
      ->drupalGetHeader('Expires'), 'Fri, 19 Nov 2008 05:00:00 GMT', 'Default header was replaced.');
    $this
      ->drupalGet('system-test/set-header', array(
      'query' => array(
        'name' => 'Vary',
        'value' => 'User-Agent',
      ),
    ));
    $this
      ->assertEqual(strtolower($this
      ->drupalGetHeader('Vary')), 'user-agent,accept-encoding', 'Default header was replaced.');

    // Check that authenticated users bypass the cache.
    $user = $this
      ->drupalCreateUser();
    $this
      ->drupalLogin($user);
    $this
      ->drupalGet('system-test/set-header', array(
      'query' => array(
        'name' => 'Foo',
        'value' => 'bar',
      ),
    ));
    $this
      ->assertFalse($this
      ->drupalGetHeader('X-Drupal-Cache'), 'Caching was bypassed.');
    $this
      ->assertTrue(strpos(strtolower($this
      ->drupalGetHeader('Vary')), 'cookie') === FALSE, 'Vary: Cookie header was not sent.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Cache-Control'), 'must-revalidate, no-cache, post-check=0, pre-check=0, private', 'Cache-Control header was sent.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Expires'), 'Sun, 19 Nov 1978 05:00:00 GMT', 'Expires header was sent.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Foo'), 'bar', 'Custom header was sent.');

    // Until bubbling of max-age up to the response is supported, verify that
    // a custom #cache max-age set on an element does not affect page max-age.
    $this
      ->drupalLogout();
    $this
      ->drupalGet('system-test/cache_maxage_page');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Cache-Control'), 'max-age=300, public');
  }

  /**
   * Tests the automatic presence of the anonymous role's cache tag.
   *
   * The 'user.permissions' cache context ensures that if the permissions for a
   * role are modified, users are not served stale render cache content. But,
   * when entire responses are cached in reverse proxies, the value for the
   * cache context is never calculated, causing the stale response to not be
   * invalidated. Therefore, when varying by permissions and the current user is
   * the anonymous user, the cache tag for the 'anonymous' role must be added.
   *
   * This test verifies that, and it verifies that it does not happen for other
   * roles.
   */
  public function testPageCacheAnonymousRolePermissions() {
    $config = $this
      ->config('system.performance');
    $config
      ->set('cache.page.max_age', 300);
    $config
      ->save();
    $content_url = Url::fromRoute('system_test.permission_dependent_content');
    $route_access_url = Url::fromRoute('system_test.permission_dependent_route_access');

    // 1. anonymous user, without permission.
    $this
      ->drupalGet($content_url);
    $this
      ->assertText('Permission to pet llamas: no!');
    $this
      ->assertCacheContext('user.permissions');
    $this
      ->assertCacheTag('config:user.role.anonymous');
    $this
      ->drupalGet($route_access_url);
    $this
      ->assertCacheContext('user.permissions');
    $this
      ->assertCacheTag('config:user.role.anonymous');

    // 2. anonymous user, with permission.
    user_role_grant_permissions(RoleInterface::ANONYMOUS_ID, [
      'pet llamas',
    ]);
    $this
      ->drupalGet($content_url);
    $this
      ->assertText('Permission to pet llamas: yes!');
    $this
      ->assertCacheContext('user.permissions');
    $this
      ->assertCacheTag('config:user.role.anonymous');
    $this
      ->drupalGet($route_access_url);
    $this
      ->assertCacheContext('user.permissions');
    $this
      ->assertCacheTag('config:user.role.anonymous');

    // 3. authenticated user, without permission.
    $auth_user = $this
      ->drupalCreateUser();
    $this
      ->drupalLogin($auth_user);
    $this
      ->drupalGet($content_url);
    $this
      ->assertText('Permission to pet llamas: no!');
    $this
      ->assertCacheContext('user.permissions');
    $this
      ->assertNoCacheTag('config:user.role.authenticated');
    $this
      ->drupalGet($route_access_url);
    $this
      ->assertCacheContext('user.permissions');
    $this
      ->assertNoCacheTag('config:user.role.authenticated');

    // 4. authenticated user, with permission.
    user_role_grant_permissions(RoleInterface::AUTHENTICATED_ID, [
      'pet llamas',
    ]);
    $this
      ->drupalGet($content_url);
    $this
      ->assertText('Permission to pet llamas: yes!');
    $this
      ->assertCacheContext('user.permissions');
    $this
      ->assertNoCacheTag('config:user.role.authenticated');
    $this
      ->drupalGet($route_access_url);
    $this
      ->assertCacheContext('user.permissions');
    $this
      ->assertNoCacheTag('config:user.role.authenticated');
  }

  /**
   * Tests the 4xx-response cache tag is added and invalidated.
   */
  function testPageCacheAnonymous403404() {
    $admin_url = Url::fromRoute('system.admin');
    $invalid_url = 'foo/does_not_exist';
    $tests = [
      403 => $admin_url,
      404 => $invalid_url,
    ];
    foreach ($tests as $code => $content_url) {

      // Anonymous user, without permissions.
      $this
        ->drupalGet($content_url);
      $this
        ->assertResponse($code);
      $this
        ->assertEqual($this
        ->drupalGetHeader('X-Drupal-Cache'), 'MISS');
      $this
        ->assertCacheTag('4xx-response');
      $this
        ->drupalGet($content_url);
      $this
        ->assertResponse($code);
      $this
        ->assertEqual($this
        ->drupalGetHeader('X-Drupal-Cache'), 'HIT');
      $entity_values = array(
        'name' => $this
          ->randomMachineName(),
        'user_id' => 1,
        'field_test_text' => array(
          0 => array(
            'value' => $this
              ->randomString(),
            'format' => 'plain_text',
          ),
        ),
      );
      $entity = EntityTest::create($entity_values);
      $entity
        ->save();

      // Saving an entity clears 4xx cache tag.
      $this
        ->drupalGet($content_url);
      $this
        ->assertResponse($code);
      $this
        ->assertEqual($this
        ->drupalGetHeader('X-Drupal-Cache'), 'MISS');
      $this
        ->drupalGet($content_url);
      $this
        ->assertResponse($code);
      $this
        ->assertEqual($this
        ->drupalGetHeader('X-Drupal-Cache'), 'HIT');

      // Rebuilding the router should invalidate the 4xx cache tag.
      $this->container
        ->get('router.builder')
        ->rebuild();
      $this
        ->drupalGet($content_url);
      $this
        ->assertResponse($code);
      $this
        ->assertEqual($this
        ->drupalGetHeader('X-Drupal-Cache'), 'MISS');
    }
  }

  /**
   * Tests the omit_vary_cookie setting.
   */
  public function testPageCacheWithoutVaryCookie() {
    $config = $this
      ->config('system.performance');
    $config
      ->set('cache.page.max_age', 300);
    $config
      ->save();
    $settings['settings']['omit_vary_cookie'] = (object) array(
      'value' => TRUE,
      'required' => TRUE,
    );
    $this
      ->writeSettings($settings);

    // Fill the cache.
    $this
      ->drupalGet('');
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'MISS', 'Page was not cached.');
    $this
      ->assertTrue(strpos($this
      ->drupalGetHeader('Vary'), 'Cookie') === FALSE, 'Vary: Cookie header was not sent.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Cache-Control'), 'max-age=300, public', 'Cache-Control header was sent.');

    // Check cache.
    $this
      ->drupalGet('');
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Page was cached.');
    $this
      ->assertTrue(strpos($this
      ->drupalGetHeader('Vary'), 'Cookie') === FALSE, 'Vary: Cookie header was not sent.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Cache-Control'), 'max-age=300, public', 'Cache-Control header was sent.');
  }

  /**
   * Test the setting of forms to be immutable.
   */
  public function testFormImmutability() {

    // Install the module that provides the test form.
    $this->container
      ->get('module_installer')
      ->install([
      'page_cache_form_test',
    ]);

    // Uninstall the page_cache module to verify that form is immutable
    // regardless of the internal page cache module.
    $this->container
      ->get('module_installer')
      ->uninstall([
      'page_cache',
    ]);
    \Drupal::service('router.builder')
      ->rebuild();
    $this
      ->drupalGet('page_cache_form_test_immutability');
    $this
      ->assertText("Immutable: TRUE", "Form is immutable.");

    // The immutable flag is set unconditionally by system_form_alter(), set
    // a flag to tell page_cache_form_test_module_implements_alter() to disable
    // that implementation.
    \Drupal::state()
      ->set('page_cache_bypass_form_immutability', TRUE);
    \Drupal::moduleHandler()
      ->resetImplementations();
    Cache::invalidateTags([
      'rendered',
    ]);
    $this
      ->drupalGet('page_cache_form_test_immutability');
    $this
      ->assertText("Immutable: FALSE", "Form is not immutable,");
  }

  /**
   * Tests cacheability of a CacheableResponse.
   *
   * Tests the difference between having a controller return a plain Symfony
   * Response object versus returning a Response object that implements the
   * CacheableResponseInterface.
   */
  public function testCacheableResponseResponses() {
    $config = $this
      ->config('system.performance');
    $config
      ->set('cache.page.max_age', 300);
    $config
      ->save();

    // GET a URL, which would be marked as a cache miss if it were cacheable.
    $this
      ->drupalGet('/system-test/respond-reponse');
    $this
      ->assertFalse($this
      ->drupalGetHeader('X-Drupal-Cache'), 'Drupal page cache header not found.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Cache-Control'), 'must-revalidate, no-cache, post-check=0, pre-check=0, private', 'Cache-Control header was sent');

    // GET it again, verify it's still not cached.
    $this
      ->drupalGet('/system-test/respond-reponse');
    $this
      ->assertFalse($this
      ->drupalGetHeader('X-Drupal-Cache'), 'Drupal page cache header not found.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Cache-Control'), 'must-revalidate, no-cache, post-check=0, pre-check=0, private', 'Cache-Control header was sent');

    // GET a URL, which would be marked as a cache miss if it were cacheable.
    $this
      ->drupalGet('/system-test/respond-public-response');
    $this
      ->assertFalse($this
      ->drupalGetHeader('X-Drupal-Cache'), 'Drupal page cache header not found.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Cache-Control'), 'max-age=60, public', 'Cache-Control header was sent');

    // GET it again, verify it's still not cached.
    $this
      ->drupalGet('/system-test/respond-public-response');
    $this
      ->assertFalse($this
      ->drupalGetHeader('X-Drupal-Cache'), 'Drupal page cache header not found.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Cache-Control'), 'max-age=60, public', 'Cache-Control header was sent');

    // GET a URL, which should be marked as a cache miss.
    $this
      ->drupalGet('/system-test/respond-cacheable-reponse');
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'MISS', 'Page was not cached.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Cache-Control'), 'max-age=300, public', 'Cache-Control header was sent.');

    // GET it again, it should now be a cache hit.
    $this
      ->drupalGet('/system-test/respond-cacheable-reponse');
    $this
      ->assertEqual($this
      ->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Page was cached.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Cache-Control'), 'max-age=300, public', 'Cache-Control header was sent.');

    // Uninstall page cache. This should flush all caches so the next call to a
    // previously cached page should be a miss now.
    $this->container
      ->get('module_installer')
      ->uninstall([
      'page_cache',
    ]);

    // GET a URL that was cached by Page Cache before, it should not be now.
    $this
      ->drupalGet('/respond-cacheable-reponse');
    $this
      ->assertFalse($this
      ->drupalGetHeader('X-Drupal-Cache'), 'Drupal page cache header not found.');
  }

}

Classes

Name	Description
PageCacheTest	Enables the page cache and tests it with various HTTP requests.