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diff --git a/web/core/modules/comment/tests/src/Functional/CommentLanguageTest.php b/web/core/modules/comment/tests/src/Functional/CommentLanguageTest.php
new file mode 100644
index 000000000..ce9a9abb0
--- /dev/null
+++ b/web/core/modules/comment/tests/src/Functional/CommentLanguageTest.php
@@ -0,0 +1,136 @@
+<?php
+
+namespace Drupal\Tests\comment\Functional;
+
+use Drupal\comment\Entity\Comment;
+use Drupal\comment\Plugin\Field\FieldType\CommentItemInterface;
+use Drupal\comment\Tests\CommentTestTrait;
+use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests for comment language.
+ *
+ * @group comment
+ */
+class CommentLanguageTest extends BrowserTestBase {
+
+  use CommentTestTrait;
+
+  /**
+   * Modules to install.
+   *
+   * We also use the language_test module here to be able to turn on content
+   * language negotiation. Drupal core does not provide a way in itself to do
+   * that.
+   *
+   * @var array
+   */
+  public static $modules = ['node', 'language', 'language_test', 'comment_test'];
+
+  protected function setUp() {
+    parent::setUp();
+
+    $this->drupalCreateContentType(['type' => 'article', 'name' => 'Article']);
+
+    // Create and log in user.
+    $admin_user = $this->drupalCreateUser(['administer site configuration', 'administer languages', 'access administration pages', 'administer content types', 'administer comments', 'create article content', 'access comments', 'post comments', 'skip comment approval']);
+    $this->drupalLogin($admin_user);
+
+    // Add language.
+    $edit = ['predefined_langcode' => 'fr'];
+    $this->drupalPostForm('admin/config/regional/language/add', $edit, t('Add language'));
+
+    // Set "Article" content type to use multilingual support.
+    $edit = ['language_configuration[language_alterable]' => TRUE];
+    $this->drupalPostForm('admin/structure/types/manage/article', $edit, t('Save content type'));
+
+    // Enable content language negotiation UI.
+    \Drupal::state()->set('language_test.content_language_type', TRUE);
+
+    // Set interface language detection to user and content language detection
+    // to URL. Disable inheritance from interface language to ensure content
+    // language will fall back to the default language if no URL language can be
+    // detected.
+    $edit = [
+      'language_interface[enabled][language-user]' => TRUE,
+      'language_content[enabled][language-url]' => TRUE,
+      'language_content[enabled][language-interface]' => FALSE,
+    ];
+    $this->drupalPostForm('admin/config/regional/language/detection', $edit, t('Save settings'));
+
+    // Change user language preference, this way interface language is always
+    // French no matter what path prefix the URLs have.
+    $edit = ['preferred_langcode' => 'fr'];
+    $this->drupalPostForm("user/" . $admin_user->id() . "/edit", $edit, t('Save'));
+
+    // Create comment field on article.
+    $this->addDefaultCommentField('node', 'article');
+
+    // Make comment body translatable.
+    $field_storage = FieldStorageConfig::loadByName('comment', 'comment_body');
+    $field_storage->setTranslatable(TRUE);
+    $field_storage->save();
+    $this->assertTrue($field_storage->isTranslatable(), 'Comment body is translatable.');
+  }
+
+  /**
+   * Test that comment language is properly set.
+   */
+  public function testCommentLanguage() {
+
+    // Create two nodes, one for english and one for french, and comment each
+    // node using both english and french as content language by changing URL
+    // language prefixes. Meanwhile interface language is always French, which
+    // is the user language preference. This way we can ensure that node
+    // language and interface language do not influence comment language, as
+    // only content language has to.
+    foreach ($this->container->get('language_manager')->getLanguages() as $node_langcode => $node_language) {
+      // Create "Article" content.
+      $title = $this->randomMachineName();
+      $edit = [
+        'title[0][value]' => $title,
+        'body[0][value]' => $this->randomMachineName(),
+        'langcode[0][value]' => $node_langcode,
+        'comment[0][status]' => CommentItemInterface::OPEN,
+      ];
+      $this->drupalPostForm("node/add/article", $edit, t('Save'));
+      $node = $this->drupalGetNodeByTitle($title);
+
+      $prefixes = language_negotiation_url_prefixes();
+      foreach ($this->container->get('language_manager')->getLanguages() as $langcode => $language) {
+        // Post a comment with content language $langcode.
+        $prefix = empty($prefixes[$langcode]) ? '' : $prefixes[$langcode] . '/';
+        $comment_values[$node_langcode][$langcode] = $this->randomMachineName();
+        $edit = [
+          'subject[0][value]' => $this->randomMachineName(),
+          'comment_body[0][value]' => $comment_values[$node_langcode][$langcode],
+        ];
+        $this->drupalPostForm($prefix . 'node/' . $node->id(), $edit, t('Preview'));
+        $this->drupalPostForm(NULL, $edit, t('Save'));
+
+        // Check that comment language matches the current content language.
+        $cids = \Drupal::entityQuery('comment')
+          ->condition('entity_id', $node->id())
+          ->condition('entity_type', 'node')
+          ->condition('field_name', 'comment')
+          ->sort('cid', 'DESC')
+          ->range(0, 1)
+          ->execute();
+        $comment = Comment::load(reset($cids));
+        $args = ['%node_language' => $node_langcode, '%comment_language' => $comment->langcode->value, '%langcode' => $langcode];
+        $this->assertEqual($comment->langcode->value, $langcode, format_string('The comment posted with content language %langcode and belonging to the node with language %node_language has language %comment_language', $args));
+        $this->assertEqual($comment->comment_body->value, $comment_values[$node_langcode][$langcode], 'Comment body correctly stored.');
+      }
+    }
+
+    // Check that comment bodies appear in the administration UI.
+    $this->drupalGet('admin/content/comment');
+    foreach ($comment_values as $node_values) {
+      foreach ($node_values as $value) {
+        $this->assertRaw($value);
+      }
+    }
+  }
+
+}