class RenderCacheTest

class RenderCacheTest extends KernelTestBase {
    use UserCreationTrait;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'user',
        'system',
    ];
    
    /**
     * {@inheritdoc}
     *
     * @todo Remove and fix test to not rely on super user.
     * @see https://www.drupal.org/project/drupal/issues/3437620
     */
    protected bool $usesSuperUserAccessPolicy = TRUE;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->installEntitySchema('user');
        $this->installConfig([
            'user',
        ]);
    }
    
    /**
     * Tests that user 1 has a different permission context with the same roles.
     */
    public function testUser1PermissionContext() : void {
        $this->doTestUser1WithContexts([
            'user.permissions',
        ]);
    }
    
    /**
     * Tests that user 1 has a different roles context with the same roles.
     */
    public function testUser1RolesContext() : void {
        $this->doTestUser1WithContexts([
            'user.roles',
        ]);
    }
    
    /**
     * Ensures that user 1 has a unique render cache for the given context.
     *
     * @param string[] $contexts
     *   List of cache contexts to use.
     */
    protected function doTestUser1WithContexts($contexts) {
        // Test that user 1 does not share the cache with other users who have the
        // same roles, even when using a role-based cache context.
        $user1 = $this->createUser();
        $this->assertEquals(1, $user1->id());
        $first_authenticated_user = $this->createUser();
        $second_authenticated_user = $this->createUser();
        $admin_user = $this->createUser([], NULL, TRUE);
        $this->assertEquals($user1->getRoles(), $first_authenticated_user->getRoles(), 'User 1 has the same roles as an authenticated user.');
        // Impersonate user 1 and render content that only user 1 should have
        // permission to see.
        \Drupal::service('account_switcher')->switchTo($user1);
        $test_element = [
            '#cache' => [
                'keys' => [
                    'test',
                ],
                'contexts' => $contexts,
            ],
        ];
        $element = $test_element;
        $element['#markup'] = 'content for admin users';
        $output = \Drupal::service('renderer')->renderRoot($element);
        $this->assertEquals('content for admin users', $output);
        // Verify the cache is working by rendering the same element but with
        // different markup passed in; the result should be the same.
        $element = $test_element;
        $element['#markup'] = 'should not be used';
        $output = \Drupal::service('renderer')->renderRoot($element);
        $this->assertEquals('content for admin users', $output);
        \Drupal::service('account_switcher')->switchBack();
        // Verify that the first authenticated user does not see the same content
        // as user 1.
        \Drupal::service('account_switcher')->switchTo($first_authenticated_user);
        $element = $test_element;
        $element['#markup'] = 'content for authenticated users';
        $output = \Drupal::service('renderer')->renderRoot($element);
        $this->assertEquals('content for authenticated users', $output);
        \Drupal::service('account_switcher')->switchBack();
        // Verify that the second authenticated user shares the cache with the
        // first authenticated user.
        \Drupal::service('account_switcher')->switchTo($second_authenticated_user);
        $element = $test_element;
        $element['#markup'] = 'should not be used';
        $output = \Drupal::service('renderer')->renderRoot($element);
        $this->assertEquals('content for authenticated users', $output);
        \Drupal::service('account_switcher')->switchBack();
        // The admin user should have the same cache as user 1, as the admin role
        // has the same permissions hash.
        \Drupal::service('account_switcher')->switchTo($admin_user);
        $element = $test_element;
        $element['#markup'] = 'content that is role specific';
        $output = \Drupal::service('renderer')->renderRoot($element);
        $expected = in_array('user.roles', $contexts, TRUE) ? 'content that is role specific' : 'content for admin users';
        $this->assertEquals($expected, $output);
        \Drupal::service('account_switcher')->switchBack();
    }

}