ModerationLocaleTest.php

<?php

declare (strict_types=1);
namespace Drupal\Tests\content_moderation\Functional;

use Drupal\node\NodeInterface;
use Drupal\Tests\content_translation\Traits\ContentTranslationTestTrait;

/**
 * Test content_moderation functionality with localization and translation.
 *
 * @group content_moderation
 * @group #slow
 */
class ModerationLocaleTest extends ModerationStateTestBase {
    use ContentTranslationTestTrait;
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'node',
        'content_moderation',
        'locale',
        'content_translation',
    ];
    
    /**
     * {@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 $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->drupalLogin($this->rootUser);
        // Enable moderation on Article node type.
        $this->createContentTypeFromUi('Article', 'article', TRUE);
        // Add French and Italian languages.
        static::createLanguageFromLangcode('fr');
        static::createLanguageFromLangcode('it');
        // Enable content translation on articles.
        $this->enableContentTranslation('node', 'article');
        // Adding languages requires a container rebuild in the test running
        // environment so that multilingual services are used.
        $this->rebuildContainer();
    }
    
    /**
     * Tests article translations can be moderated separately.
     */
    public function testTranslateModeratedContent() : void {
        // Create a published article in English.
        $edit = [
            'title[0][value]' => 'Published English node',
            'langcode[0][value]' => 'en',
            'moderation_state[0][state]' => 'published',
        ];
        $this->drupalGet('node/add/article');
        $this->submitForm($edit, 'Save');
        $this->assertSession()
            ->pageTextContains('Article Published English node has been created.');
        $english_node = $this->drupalGetNodeByTitle('Published English node');
        // Add a French translation.
        $this->drupalGet('node/' . $english_node->id() . '/translations');
        $this->clickLink('Add');
        $edit = [
            'title[0][value]' => 'French node Draft',
            'moderation_state[0][state]' => 'draft',
        ];
        $this->submitForm($edit, 'Save (this translation)');
        // Here the error has occurred "The website encountered an unexpected error.
        // Try again later."
        // If the translation has got lost.
        $this->assertSession()
            ->pageTextContains('Article French node Draft has been updated.');
        // Create an article in English.
        $edit = [
            'title[0][value]' => 'English node',
            'langcode[0][value]' => 'en',
            'moderation_state[0][state]' => 'draft',
        ];
        $this->drupalGet('node/add/article');
        $this->submitForm($edit, 'Save');
        $this->assertSession()
            ->pageTextContains('Article English node has been created.');
        $english_node = $this->drupalGetNodeByTitle('English node');
        // Add a French translation.
        $this->drupalGet('node/' . $english_node->id() . '/translations');
        $this->clickLink('Add');
        $edit = [
            'title[0][value]' => 'French node',
            'moderation_state[0][state]' => 'draft',
        ];
        $this->submitForm($edit, 'Save (this translation)');
        $this->assertSession()
            ->pageTextContains('Article French node has been updated.');
        $english_node = $this->drupalGetNodeByTitle('English node', TRUE);
        // Publish the English article and check that the translation stays
        // unpublished.
        $this->drupalGet('node/' . $english_node->id() . '/edit');
        $this->submitForm([
            'moderation_state[0][state]' => 'published',
        ], 'Save (this translation)');
        $this->assertSession()
            ->pageTextContains('Article English node has been updated.');
        $english_node = $this->drupalGetNodeByTitle('English node', TRUE);
        $french_node = $english_node->getTranslation('fr');
        $this->assertEquals('French node', $french_node->label());
        $this->assertEquals('published', $english_node->moderation_state->value);
        $this->assertTrue($english_node->isPublished());
        $this->assertEquals('draft', $french_node->moderation_state->value);
        $this->assertFalse($french_node->isPublished());
        // Create another article with its translation. This time we will publish
        // the translation first.
        $edit = [
            'title[0][value]' => 'Another node',
            'moderation_state[0][state]' => 'draft',
        ];
        $this->drupalGet('node/add/article');
        $this->submitForm($edit, 'Save');
        $this->assertSession()
            ->pageTextContains('Article Another node has been created.');
        $english_node = $this->drupalGetNodeByTitle('Another node');
        // Add a French translation.
        $this->drupalGet('node/' . $english_node->id() . '/translations');
        $this->clickLink('Add');
        $edit = [
            'title[0][value]' => 'Translated node',
            'moderation_state[0][state]' => 'draft',
        ];
        $this->submitForm($edit, 'Save (this translation)');
        $this->assertSession()
            ->pageTextContains('Article Translated node has been updated.');
        $english_node = $this->drupalGetNodeByTitle('Another node', TRUE);
        // Publish the translation and check that the source language version stays
        // unpublished.
        $this->drupalGet('fr/node/' . $english_node->id() . '/edit');
        $this->submitForm([
            'moderation_state[0][state]' => 'published',
        ], 'Save (this translation)');
        $this->assertSession()
            ->pageTextContains('Article Translated node has been updated.');
        $english_node = $this->drupalGetNodeByTitle('Another node', TRUE);
        $french_node = $english_node->getTranslation('fr');
        $this->assertEquals('published', $french_node->moderation_state->value);
        $this->assertTrue($french_node->isPublished());
        $this->assertEquals('draft', $english_node->moderation_state->value);
        $this->assertFalse($english_node->isPublished());
        // Now check that we can create a new draft of the translation.
        $edit = [
            'title[0][value]' => 'New draft of translated node',
            'moderation_state[0][state]' => 'draft',
        ];
        $this->drupalGet('fr/node/' . $english_node->id() . '/edit');
        $this->submitForm($edit, 'Save (this translation)');
        $this->assertSession()
            ->pageTextContains('Article New draft of translated node has been updated.');
        $english_node = $this->drupalGetNodeByTitle('Another node', TRUE);
        $french_node = $english_node->getTranslation('fr');
        $this->assertEquals('published', $french_node->moderation_state->value);
        $this->assertTrue($french_node->isPublished());
        $this->assertEquals('Translated node', $french_node->getTitle(), 'The default revision of the published translation remains the same.');
        // Publish the French article before testing the archive transition.
        $this->drupalGet('fr/node/' . $english_node->id() . '/edit');
        $this->submitForm([
            'moderation_state[0][state]' => 'published',
        ], 'Save (this translation)');
        $this->assertSession()
            ->pageTextContains('Article New draft of translated node has been updated.');
        $english_node = $this->drupalGetNodeByTitle('Another node', TRUE);
        $french_node = $english_node->getTranslation('fr');
        $this->assertEquals('published', $french_node->moderation_state->value);
        $this->assertTrue($french_node->isPublished());
        $this->assertEquals('New draft of translated node', $french_node->getTitle(), 'The draft has replaced the published revision.');
        // Publish the English article before testing the archive transition.
        $this->drupalGet('node/' . $english_node->id() . '/edit');
        $this->submitForm([
            'moderation_state[0][state]' => 'published',
        ], 'Save (this translation)');
        $this->assertSession()
            ->pageTextContains('Article Another node has been updated.');
        $english_node = $this->drupalGetNodeByTitle('Another node', TRUE);
        $this->assertEquals('published', $english_node->moderation_state->value);
        // Archive the node and its translation.
        $this->drupalGet('node/' . $english_node->id() . '/edit');
        $this->submitForm([
            'moderation_state[0][state]' => 'archived',
        ], 'Save (this translation)');
        $this->assertSession()
            ->pageTextContains('Article Another node has been updated.');
        $this->drupalGet('fr/node/' . $english_node->id() . '/edit');
        $this->submitForm([
            'moderation_state[0][state]' => 'archived',
        ], 'Save (this translation)');
        $this->assertSession()
            ->pageTextContains('Article New draft of translated node has been updated.');
        $english_node = $this->drupalGetNodeByTitle('Another node', TRUE);
        $french_node = $english_node->getTranslation('fr');
        $this->assertEquals('archived', $english_node->moderation_state->value);
        $this->assertFalse($english_node->isPublished());
        $this->assertEquals('archived', $french_node->moderation_state->value);
        $this->assertFalse($french_node->isPublished());
    }
    
    /**
     * Tests that individual translations can be moderated independently.
     */
    public function testLanguageIndependentContentModeration() : void {
        // Create a published article in English (revision 1).
        $this->drupalGet('node/add/article');
        $node = $this->submitNodeForm('Test 1.1 EN', 'published');
        $this->assertNotLatestVersionPage($node);
        $edit_path = $node->toUrl('edit-form');
        $translate_path = $node->toUrl('drupal:content-translation-overview');
        // Create a new English draft (revision 2).
        $this->drupalGet($edit_path);
        $this->submitNodeForm('Test 1.2 EN', 'draft', TRUE);
        $this->assertLatestVersionPage($node);
        // Add a French translation draft (revision 3).
        $this->drupalGet($translate_path);
        $this->clickLink('Add');
        $this->submitNodeForm('Test 1.3 FR', 'draft');
        $fr_node = $this->loadTranslation($node, 'fr');
        $this->assertLatestVersionPage($fr_node);
        $this->assertModerationForm($node);
        // Add an Italian translation draft (revision 4).
        $this->drupalGet($translate_path);
        $this->clickLink('Add');
        $this->submitNodeForm('Test 1.4 IT', 'draft');
        $it_node = $this->loadTranslation($node, 'it');
        $this->assertLatestVersionPage($it_node);
        $this->assertModerationForm($node);
        $this->assertModerationForm($fr_node);
        // Publish the English draft (revision 5).
        $this->drupalGet($edit_path);
        $this->submitNodeForm('Test 1.5 EN', 'published', TRUE);
        $this->assertNotLatestVersionPage($node);
        $this->assertModerationForm($fr_node);
        $this->assertModerationForm($it_node);
        // Publish the Italian draft (revision 6).
        $this->drupalGet($translate_path);
        $this->clickLink('Edit', 3);
        $this->submitNodeForm('Test 1.6 IT', 'published');
        $this->assertNotLatestVersionPage($it_node);
        $this->assertNoModerationForm($node);
        $this->assertModerationForm($fr_node);
        // Publish the French draft (revision 7).
        $this->drupalGet($translate_path);
        $this->clickLink('Edit', 2);
        $this->submitNodeForm('Test 1.7 FR', 'published');
        $this->assertNotLatestVersionPage($fr_node);
        $this->assertNoModerationForm($node);
        $this->assertNoModerationForm($it_node);
        // Create an Italian draft (revision 8).
        $this->drupalGet($translate_path);
        $this->clickLink('Edit', 3);
        $this->submitNodeForm('Test 1.8 IT', 'draft');
        $this->assertLatestVersionPage($it_node);
        $this->assertNoModerationForm($node);
        $this->assertNoModerationForm($fr_node);
        // Create a French draft (revision 9).
        $this->drupalGet($translate_path);
        $this->clickLink('Edit', 2);
        $this->submitNodeForm('Test 1.9 FR', 'draft');
        $this->assertLatestVersionPage($fr_node);
        $this->assertNoModerationForm($node);
        $this->assertModerationForm($it_node);
        // Create an English draft (revision 10).
        $this->drupalGet($edit_path);
        $this->submitNodeForm('Test 1.10 EN', 'draft');
        $this->assertLatestVersionPage($node);
        $this->assertModerationForm($fr_node);
        $this->assertModerationForm($it_node);
        // Now start from a draft article in English (revision 1).
        $this->drupalGet('node/add/article');
        $node2 = $this->submitNodeForm('Test 2.1 EN', 'draft', TRUE);
        $this->assertNotLatestVersionPage($node2, TRUE);
        $edit_path = $node2->toUrl('edit-form');
        $translate_path = $node2->toUrl('drupal:content-translation-overview');
        // Add a French translation (revision 2).
        $this->drupalGet($translate_path);
        $this->clickLink('Add');
        $this->submitNodeForm('Test 2.2 FR', 'draft');
        $fr_node2 = $this->loadTranslation($node2, 'fr');
        $this->assertNotLatestVersionPage($fr_node2, TRUE);
        $this->assertModerationForm($node2, FALSE);
        // Add an Italian translation (revision 3).
        $this->drupalGet($translate_path);
        $this->clickLink('Add');
        $this->submitNodeForm('Test 2.3 IT', 'draft');
        $it_node2 = $this->loadTranslation($node2, 'it');
        $this->assertNotLatestVersionPage($it_node2, TRUE);
        $this->assertModerationForm($node2, FALSE);
        $this->assertModerationForm($fr_node2, FALSE);
        // Publish the English draft (revision 4).
        $this->drupalGet($edit_path);
        $this->submitNodeForm('Test 2.4 EN', 'published', TRUE);
        $this->assertNotLatestVersionPage($node2);
        $this->assertModerationForm($fr_node2, FALSE);
        $this->assertModerationForm($it_node2, FALSE);
        // Publish the Italian draft (revision 5).
        $this->drupalGet($translate_path);
        $this->clickLink('Edit', 3);
        $this->submitNodeForm('Test 2.5 IT', 'published');
        $this->assertNotLatestVersionPage($it_node2);
        $this->assertNoModerationForm($node2);
        $this->assertModerationForm($fr_node2, FALSE);
        // Publish the French draft (revision 6).
        $this->drupalGet($translate_path);
        $this->clickLink('Edit', 2);
        $this->submitNodeForm('Test 2.6 FR', 'published');
        $this->assertNotLatestVersionPage($fr_node2);
        $this->assertNoModerationForm($node2);
        $this->assertNoModerationForm($it_node2);
        // Now that all revision translations are published, verify that the
        // moderation form is never displayed on revision pages.
        
        /** @var \Drupal\node\NodeStorageInterface $storage */
        $storage = $this->container
            ->get('entity_type.manager')
            ->getStorage('node');
        foreach (range(11, 16) as $revision_id) {
            
            /** @var \Drupal\node\NodeInterface $revision */
            $revision = $storage->loadRevision($revision_id);
            foreach ($revision->getTranslationLanguages() as $langcode => $language) {
                if ($revision->isRevisionTranslationAffected()) {
                    $this->drupalGet($revision->toUrl('revision'));
                    $this->assertFalse($this->hasModerationForm(), 'Moderation form is not displayed correctly for revision ' . $revision_id);
                    break;
                }
            }
        }
        // Create an Italian draft (revision 7).
        $this->drupalGet($translate_path);
        $this->clickLink('Edit', 3);
        $this->submitNodeForm('Test 2.7 IT', 'draft');
        $this->assertLatestVersionPage($it_node2);
        $this->assertNoModerationForm($node2);
        $this->assertNoModerationForm($fr_node2);
        // Create a French draft (revision 8).
        $this->drupalGet($translate_path);
        $this->clickLink('Edit', 2);
        $this->submitNodeForm('Test 2.8 FR', 'draft');
        $this->assertLatestVersionPage($fr_node2);
        $this->assertNoModerationForm($node2);
        $this->assertModerationForm($it_node2);
        // Create an English draft (revision 9).
        $this->drupalGet($edit_path);
        $this->submitNodeForm('Test 2.9 EN', 'draft', TRUE);
        $this->assertLatestVersionPage($node2);
        $this->assertModerationForm($fr_node2);
        $this->assertModerationForm($it_node2);
        // Now publish a draft in another language first and verify that the
        // moderation form is not displayed on the English node view page.
        $this->drupalGet('node/add/article');
        $node3 = $this->submitNodeForm('Test 3.1 EN', 'published');
        $this->assertNotLatestVersionPage($node3);
        $edit_path = $node3->toUrl('edit-form');
        $translate_path = $node3->toUrl('drupal:content-translation-overview');
        // Create an English draft (revision 2).
        $this->drupalGet($edit_path);
        $this->submitNodeForm('Test 3.2 EN', 'draft', TRUE);
        $this->assertLatestVersionPage($node3);
        // Add a French translation (revision 3).
        $this->drupalGet($translate_path);
        $this->clickLink('Add');
        $this->submitNodeForm('Test 3.3 FR', 'draft');
        $fr_node3 = $this->loadTranslation($node3, 'fr');
        $this->assertLatestVersionPage($fr_node3);
        $this->assertModerationForm($node3);
        // Publish the French draft (revision 4).
        $this->drupalGet($translate_path);
        $this->clickLink('Edit', 2);
        $this->submitNodeForm('Test 3.4 FR', 'published');
        $this->assertNotLatestVersionPage($fr_node3);
        $this->assertModerationForm($node3);
    }
    
    /**
     * Checks that new translation values are populated properly.
     */
    public function testNewTranslationSourceValues() : void {
        // Create a published article in Italian (revision 1).
        $this->drupalGet('node/add/article');
        $node = $this->submitNodeForm('Test 1.1 IT', 'published', TRUE, 'it');
        $this->assertNotLatestVersionPage($node);
        // Create a new draft (revision 2).
        $this->drupalGet($node->toUrl('edit-form'));
        $this->submitNodeForm('Test 1.2 IT', 'draft', TRUE);
        $this->assertLatestVersionPage($node);
        // Create an English draft (revision 3) and verify that the Italian draft
        // values are used as source values.
        $url = $node->toUrl('drupal:content-translation-add');
        $url->setRouteParameter('source', 'it');
        $url->setRouteParameter('target', 'en');
        $this->drupalGet($url);
        $this->assertSession()
            ->pageTextContains('Test 1.2 IT');
        $this->submitNodeForm('Test 1.3 EN', 'draft');
        $this->assertLatestVersionPage($node);
        // Create a French draft (without saving) and verify that the Italian draft
        // values are used as source values.
        $url->setRouteParameter('target', 'fr');
        $this->drupalGet($url);
        $this->assertSession()
            ->pageTextContains('Test 1.2 IT');
        // Now switch source language and verify that the English draft values are
        // used as source values.
        $url->setRouteParameter('source', 'en');
        $this->drupalGet($url);
        $this->assertSession()
            ->pageTextContains('Test 1.3 EN');
    }
    
    /**
     * Tests article revision history shows revisions for the correct translation.
     */
    public function testTranslationRevisionsHistory() : void {
        // Create a published article in English.
        $edit = [
            'title[0][value]' => 'English node',
            'langcode[0][value]' => 'en',
            'moderation_state[0][state]' => 'published',
            'revision_log[0][value]' => 'Log Message - English - Published - Edit 1',
        ];
        $this->drupalGet('node/add/article');
        $this->submitForm($edit, 'Save');
        $this->assertSession()
            ->pageTextContains('Article English node has been created.');
        $node = $this->drupalGetNodeByTitle('English node');
        // Add a French translation.
        $this->drupalGet('node/' . $node->id() . '/translations');
        $this->clickLink('Add');
        $edit = [
            'title[0][value]' => 'French node',
            'moderation_state[0][state]' => 'draft',
            'revision_log[0][value]' => 'Log Message - French - Draft - Edit 1',
        ];
        $this->submitForm($edit, 'Save (this translation)');
        // Here the error has occurred "The website encountered an unexpected error.
        // Try again later."
        // If the translation has got lost.
        $this->assertSession()
            ->pageTextContains('Article French node has been updated.');
        $french_node = $this->loadTranslation($node, 'fr');
        $this->assertEquals('published', $node->moderation_state->value);
        $this->assertTrue($node->isPublished());
        $this->assertEquals('draft', $french_node->moderation_state->value);
        $this->assertFalse($french_node->isPublished());
        // Verify the revisions history for the English node.
        $this->drupalGet('node/' . $node->id() . '/revisions');
        $this->assertSession()
            ->pageTextContains('Log Message - English - Published - Edit 1');
        $this->assertSession()
            ->pageTextNotContains('Log Message - French');
        // Verify the revisions history for the French node.
        $this->drupalGet($french_node->language()
            ->getId() . '/node/' . $node->id() . '/revisions');
        $this->assertSession()
            ->pageTextContains('Log Message - French - Draft - Edit 1');
        $this->assertSession()
            ->pageTextNotContains('Log Message - English');
        // Create a new draft for the English article.
        $edit = [
            'moderation_state[0][state]' => 'draft',
            'revision_log[0][value]' => 'Log Message - English - Draft - Edit 2',
        ];
        $this->drupalGet('node/' . $node->id() . '/edit');
        $this->submitForm($edit, 'Save');
        $this->assertSession()
            ->pageTextContains('Article English node has been updated.');
        // Create a new draft for the French article.
        $edit = [
            'moderation_state[0][state]' => 'draft',
            'revision_log[0][value]' => 'Log Message - French - Draft - Edit 2',
        ];
        $this->drupalGet($french_node->language()
            ->getId() . '/node/' . $node->id() . '/edit');
        $this->submitForm($edit, 'Save (this translation)');
        $this->assertSession()
            ->pageTextContains('Article French node has been updated.');
        // Verify the revisions history for the English node.
        $this->drupalGet('node/' . $node->id() . '/revisions');
        $this->assertSession()
            ->pageTextContains('Log Message - English - Published - Edit 1');
        $this->assertSession()
            ->pageTextContains('Log Message - English - Draft - Edit 2');
        $this->assertSession()
            ->pageTextNotContains('Log Message - French');
        // Verify the revisions history for the French node.
        $this->drupalGet($french_node->language()
            ->getId() . '/node/' . $node->id() . '/revisions');
        $this->assertSession()
            ->pageTextContains('Log Message - French - Draft - Edit 1');
        $this->assertSession()
            ->pageTextContains('Log Message - French - Draft - Edit 2');
        $this->assertSession()
            ->pageTextNotContains('Log Message - English');
        // Publish the French Node.
        $edit = [
            'moderation_state[0][state]' => 'published',
            'revision_log[0][value]' => 'Log Message - French - Published - Edit 3',
        ];
        $this->drupalGet($french_node->language()
            ->getId() . '/node/' . $node->id() . '/edit');
        $this->submitForm($edit, 'Save (this translation)');
        $this->assertSession()
            ->pageTextContains('Article French node has been updated.');
        // Verify the revisions history for the English node.
        $this->drupalGet('node/' . $node->id() . '/revisions');
        $this->assertSession()
            ->pageTextContains('Log Message - English - Published - Edit 1');
        $this->assertSession()
            ->pageTextContains('Log Message - English - Draft - Edit 2');
        $this->assertSession()
            ->pageTextNotContains('Log Message - French');
        // Verify the revisions history for the French node.
        $this->drupalGet($french_node->language()
            ->getId() . '/node/' . $node->id() . '/revisions');
        $this->assertSession()
            ->pageTextContains('Log Message - French - Draft - Edit 1');
        $this->assertSession()
            ->pageTextContains('Log Message - French - Draft - Edit 2');
        $this->assertSession()
            ->pageTextContains('Log Message - French - Published - Edit 3');
        $this->assertSession()
            ->pageTextNotContains('Log Message - English');
    }
    
    /**
     * Submits the node form at the current URL with the specified values.
     *
     * @param string $title
     *   The node title.
     * @param string $moderation_state
     *   The moderation state.
     * @param bool $default_translation
     *   (optional) Whether we are editing the default translation.
     * @param string|null $langcode
     *   (optional) The node language. Defaults to English.
     *
     * @return \Drupal\node\NodeInterface|null
     *   A node object if a new one is being created, NULL otherwise.
     */
    protected function submitNodeForm($title, $moderation_state, $default_translation = FALSE, $langcode = 'en') {
        $is_new = str_contains($this->getSession()
            ->getCurrentUrl(), '/node/add/');
        $edit = [
            'title[0][value]' => $title,
            'moderation_state[0][state]' => $moderation_state,
        ];
        if ($is_new) {
            $default_translation = TRUE;
            $edit['langcode[0][value]'] = $langcode;
        }
        $submit = $default_translation ? 'Save' : 'Save (this translation)';
        $this->submitForm($edit, $submit);
        $message = $is_new ? "Article {$title} has been created." : "Article {$title} has been updated.";
        $this->assertSession()
            ->pageTextContains($message);
        return $is_new ? $this->drupalGetNodeByTitle($title) : NULL;
    }
    
    /**
     * Loads the node translation for the specified language.
     *
     * @param \Drupal\node\NodeInterface $node
     *   A node object.
     * @param string $langcode
     *   The translation language code.
     *
     * @return \Drupal\node\NodeInterface
     *   The node translation object.
     */
    protected function loadTranslation(NodeInterface $node, $langcode) {
        
        /** @var \Drupal\node\NodeStorageInterface $storage */
        $storage = $this->container
            ->get('entity_type.manager')
            ->getStorage('node');
        // Explicitly invalidate the cache for that node, as the call below is
        // statically cached.
        $storage->resetCache([
            $node->id(),
        ]);
        
        /** @var \Drupal\node\NodeInterface $node */
        $node = $storage->loadRevision($storage->getLatestRevisionId($node->id()));
        return $node->getTranslation($langcode);
    }
    
    /**
     * Asserts that this is the "latest version" page for the specified node.
     *
     * @param \Drupal\node\NodeInterface $node
     *   A node object.
     *
     * @internal
     */
    public function assertLatestVersionPage(NodeInterface $node) : void {
        $this->assertEquals($node->toUrl('latest-version')
            ->setAbsolute()
            ->toString(), $this->getSession()
            ->getCurrentUrl());
        $this->assertModerationForm($node);
    }
    
    /**
     * Asserts that this is not the "latest version" page for the specified node.
     *
     * @param \Drupal\node\NodeInterface $node
     *   A node object.
     * @param bool $moderation_form
     *   (optional) Whether the page should contain the moderation form. Defaults
     *   to FALSE.
     *
     * @internal
     */
    public function assertNotLatestVersionPage(NodeInterface $node, bool $moderation_form = FALSE) : void {
        $this->assertNotEquals($node->toUrl('latest-version')
            ->setAbsolute()
            ->toString(), $this->getSession()
            ->getCurrentUrl());
        if ($moderation_form) {
            $this->assertModerationForm($node, FALSE);
        }
        else {
            $this->assertNoModerationForm($node);
        }
    }
    
    /**
     * Asserts that the moderation form is displayed for the specified node.
     *
     * @param \Drupal\node\NodeInterface $node
     *   A node object.
     * @param bool $latest_tab
     *   (optional) Whether the node form is expected to be displayed on the
     *   latest version page or on the node view page. Defaults to the former.
     *
     * @internal
     */
    public function assertModerationForm(NodeInterface $node, bool $latest_tab = TRUE) : void {
        $this->drupalGet($node->toUrl());
        $this->assertEquals(!$latest_tab, $this->hasModerationForm());
        $this->drupalGet($node->toUrl('latest-version'));
        $this->assertEquals($latest_tab, $this->hasModerationForm());
    }
    
    /**
     * Asserts that the moderation form is not displayed for the specified node.
     *
     * @param \Drupal\node\NodeInterface $node
     *   A node object.
     *
     * @internal
     */
    public function assertNoModerationForm(NodeInterface $node) : void {
        $this->drupalGet($node->toUrl());
        $this->assertFalse($this->hasModerationForm());
        $this->drupalGet($node->toUrl('latest-version'));
        $this->assertEquals(403, $this->getSession()
            ->getStatusCode());
    }
    
    /**
     * Checks whether the page contains the moderation form.
     *
     * @return bool
     *   TRUE if the moderation form could be find in the page, FALSE otherwise.
     */
    public function hasModerationForm() {
        return (bool) $this->xpath('//ul[@class="entity-moderation-form"]');
    }

}