class BigPipeRegressionTest

class BigPipeRegressionTest extends WebDriverTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'big_pipe',
        'big_pipe_regression_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        // Use the big_pipe_test_theme theme.
        $this->container
            ->get('theme_installer')
            ->install([
            'big_pipe_test_theme',
        ]);
        $this->container
            ->get('config.factory')
            ->getEditable('system.theme')
            ->set('default', 'big_pipe_test_theme')
            ->save();
    }
    
    /**
     * Ensure BigPipe works despite inline JS containing the string "</body>".
     *
     * @see https://www.drupal.org/node/2678662
     */
    public function testMultipleClosingBodies_2678662() : void {
        $this->assertTrue($this->container
            ->get('module_installer')
            ->install([
            'render_placeholder_message_test',
        ], TRUE), 'Installed modules.');
        $this->drupalLogin($this->drupalCreateUser());
        $this->drupalGet(Url::fromRoute('big_pipe_regression_test.2678662'));
        // Confirm that AJAX behaviors were instantiated, if not, this points to a
        // JavaScript syntax error.
        $javascript = <<<JS
    (function(){
      return Object.keys(Drupal.ajax.instances).length > 0;
    }())
JS;
        $this->assertJsCondition($javascript);
        // Besides verifying there is no JavaScript syntax error, also verify the
        // HTML structure.
        // The BigPipe stop signal is present just before the closing </body> and
        // </html> tags.
        $this->assertSession()
            ->responseContains(BigPipe::STOP_SIGNAL . "\n\n\n</body></html>");
        $js_code_until_closing_body_tag = substr(BigPipeRegressionTestController::MARKER_2678662, 0, strpos(BigPipeRegressionTestController::MARKER_2678662, '</body>'));
        // The BigPipe start signal does NOT start at the closing </body> tag string
        // in an inline script.
        $this->assertSession()
            ->responseNotContains($js_code_until_closing_body_tag . "\n" . BigPipe::START_SIGNAL);
    }
    
    /**
     * Ensure messages set in placeholders always appear.
     *
     * @see https://www.drupal.org/node/2712935
     */
    public function testMessages_2712935() : void {
        $this->assertTrue($this->container
            ->get('module_installer')
            ->install([
            'render_placeholder_message_test',
        ], TRUE), 'Installed modules.');
        $this->drupalLogin($this->drupalCreateUser());
        $messages_markup = '<div class="messages messages--status" role="status"';
        $test_routes = [
            // Messages placeholder rendered first.
'render_placeholder_message_test.first',
            // Messages placeholder rendered after one, before another.
'render_placeholder_message_test.middle',
            // Messages placeholder rendered last.
'render_placeholder_message_test.last',
        ];
        $assert = $this->assertSession();
        foreach ($test_routes as $route) {
            // Verify that we start off with zero messages queued.
            $this->drupalGet(Url::fromRoute('render_placeholder_message_test.queued'));
            $assert->responseNotContains($messages_markup);
            // Verify the test case at this route behaves as expected.
            $this->drupalGet(Url::fromRoute($route));
            $assert->elementContains('css', 'p.logged-message:nth-of-type(1)', 'Message: P1');
            $assert->elementContains('css', 'p.logged-message:nth-of-type(2)', 'Message: P2');
            $assert->responseContains($messages_markup);
            $assert->elementExists('css', 'div[aria-label="Status message"]');
            $assert->responseContains('aria-label="Status message">P1');
            $assert->responseContains('aria-label="Status message">P2');
            // Verify that we end with all messages printed, hence again zero queued.
            $this->drupalGet(Url::fromRoute('render_placeholder_message_test.queued'));
            $assert->responseNotContains($messages_markup);
        }
    }
    
    /**
     * Tests edge cases with placeholder HTML.
     */
    public function testPlaceholderHtmlEdgeCases() : void {
        $this->drupalLogin($this->drupalCreateUser());
        $this->doTestPlaceholderInParagraph_2802923();
        $this->doTestBigPipeLargeContent();
        $this->doTestMultipleReplacements();
    }
    
    /**
     * Ensure default BigPipe placeholder HTML cannot split paragraphs.
     *
     * @see https://www.drupal.org/node/2802923
     */
    protected function doTestPlaceholderInParagraph_2802923() : void {
        $this->drupalGet(Url::fromRoute('big_pipe_regression_test.2802923'));
        $this->assertJsCondition('document.querySelectorAll(\'p\').length === 1');
    }
    
    /**
     * Tests BigPipe large content.
     *
     * Repeat loading of same page for two times, after second time the page is
     * cached and the bug consistently reproducible.
     */
    public function doTestBigPipeLargeContent() : void {
        $assert_session = $this->assertSession();
        $this->drupalGet(Url::fromRoute('big_pipe_test_large_content'));
        $this->assertNotNull($assert_session->waitForElement('css', 'script[data-big-pipe-event="stop"]'));
        $this->assertCount(0, $this->getDrupalSettings()['bigPipePlaceholderIds']);
        $this->assertCount(2, $this->getSession()
            ->getPage()
            ->findAll('css', 'script[data-big-pipe-replacement-for-placeholder-with-id]'));
        $assert_session->elementExists('css', '#big-pipe-large-content');
        $this->drupalGet(Url::fromRoute('big_pipe_test_large_content'));
        $this->assertNotNull($assert_session->waitForElement('css', 'script[data-big-pipe-event="stop"]'));
        $this->assertCount(0, $this->getDrupalSettings()['bigPipePlaceholderIds']);
        $this->assertCount(2, $this->getSession()
            ->getPage()
            ->findAll('css', 'script[data-big-pipe-replacement-for-placeholder-with-id]'));
        $assert_session->elementExists('css', '#big-pipe-large-content');
    }
    
    /**
     * Test BigPipe replacement of multiple complex replacements.
     *
     * In some situations with either a large number of replacements or multiple
     * replacements involving complex operations, some replacements were not
     * completed. This is a simulation of such a situation by rendering a lot of
     * placeholders on a page.
     *
     * @see https://www.drupal.org/node/3390178
     */
    protected function doTestMultipleReplacements() : void {
        $user = $this->drupalCreateUser();
        $this->drupalLogin($user);
        $assert_session = $this->assertSession();
        $this->drupalGet(Url::fromRoute('big_pipe_test_multiple_replacements'));
        $this->assertNotNull($assert_session->waitForElement('css', 'script[data-big-pipe-event="stop"]'));
        $this->assertCount(0, $this->getDrupalSettings()['bigPipePlaceholderIds']);
        $this->assertCount(0, $this->getSession()
            ->getPage()
            ->findAll('css', 'span[data-big-pipe-placeholder-id]'));
        $this->assertCount(BigPipeRegressionTestController::PLACEHOLDER_COUNT + 1, $this->getSession()
            ->getPage()
            ->findAll('css', 'script[data-big-pipe-replacement-for-placeholder-with-id]'));
    }

}