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diff --git a/web/core/modules/comment/src/Tests/CommentPreviewTest.php b/web/core/modules/comment/src/Tests/CommentPreviewTest.php
new file mode 100644
index 000000000..1b07fe600
--- /dev/null
+++ b/web/core/modules/comment/src/Tests/CommentPreviewTest.php
@@ -0,0 +1,208 @@
+<?php
+
+namespace Drupal\comment\Tests;
+
+use Drupal\comment\CommentManagerInterface;
+use Drupal\Component\Render\MarkupInterface;
+use Drupal\Core\Datetime\DrupalDateTime;
+use Drupal\comment\Entity\Comment;
+
+/**
+ * Tests comment preview.
+ *
+ * @group comment
+ */
+class CommentPreviewTest extends CommentTestBase {
+
+  /**
+   * The profile to install as a basis for testing.
+   *
+   * Using the standard profile to test user picture display in comments.
+   *
+   * @var string
+   */
+  protected $profile = 'standard';
+
+  /**
+   * Tests comment preview.
+   */
+  public function testCommentPreview() {
+    // As admin user, configure comment settings.
+    $this->drupalLogin($this->adminUser);
+    $this->setCommentPreview(DRUPAL_OPTIONAL);
+    $this->setCommentForm(TRUE);
+    $this->setCommentSubject(TRUE);
+    $this->setCommentSettings('default_mode', CommentManagerInterface::COMMENT_MODE_THREADED, 'Comment paging changed.');
+    $this->drupalLogout();
+
+    // Log in as web user.
+    $this->drupalLogin($this->webUser);
+
+    // Test escaping of the username on the preview form.
+    \Drupal::service('module_installer')->install(['user_hooks_test']);
+    \Drupal::state()->set('user_hooks_test_user_format_name_alter', TRUE);
+    $edit = [];
+    $edit['subject[0][value]'] = $this->randomMachineName(8);
+    $edit['comment_body[0][value]'] = $this->randomMachineName(16);
+    $this->drupalPostForm('node/' . $this->node->id(), $edit, t('Preview'));
+    $this->assertEscaped('<em>' . $this->webUser->id() . '</em>');
+
+    \Drupal::state()->set('user_hooks_test_user_format_name_alter_safe', TRUE);
+    $this->drupalPostForm('node/' . $this->node->id(), $edit, t('Preview'));
+    $this->assertTrue($this->webUser->getDisplayName() instanceof MarkupInterface, 'Username is marked safe');
+    $this->assertNoEscaped('<em>' . $this->webUser->id() . '</em>');
+    $this->assertRaw('<em>' . $this->webUser->id() . '</em>');
+
+    // Add a user picture.
+    $image = current($this->drupalGetTestFiles('image'));
+    $user_edit['files[user_picture_0]'] = drupal_realpath($image->uri);
+    $this->drupalPostForm('user/' . $this->webUser->id() . '/edit', $user_edit, t('Save'));
+
+    // As the web user, fill in the comment form and preview the comment.
+    $this->drupalPostForm('node/' . $this->node->id(), $edit, t('Preview'));
+
+    // Check that the preview is displaying the title and body.
+    $this->assertTitle(t('Preview comment | Drupal'), 'Page title is "Preview comment".');
+    $this->assertText($edit['subject[0][value]'], 'Subject displayed.');
+    $this->assertText($edit['comment_body[0][value]'], 'Comment displayed.');
+
+    // Check that the title and body fields are displayed with the correct values.
+    $this->assertFieldByName('subject[0][value]', $edit['subject[0][value]'], 'Subject field displayed.');
+    $this->assertFieldByName('comment_body[0][value]', $edit['comment_body[0][value]'], 'Comment field displayed.');
+
+    // Check that the user picture is displayed.
+    $this->assertFieldByXPath("//article[contains(@class, 'preview')]//div[contains(@class, 'user-picture')]//img", NULL, 'User picture displayed.');
+  }
+
+  /**
+   * Tests comment preview.
+   */
+  public function testCommentPreviewDuplicateSubmission() {
+    // As admin user, configure comment settings.
+    $this->drupalLogin($this->adminUser);
+    $this->setCommentPreview(DRUPAL_OPTIONAL);
+    $this->setCommentForm(TRUE);
+    $this->setCommentSubject(TRUE);
+    $this->setCommentSettings('default_mode', CommentManagerInterface::COMMENT_MODE_THREADED, 'Comment paging changed.');
+    $this->drupalLogout();
+
+    // Log in as web user.
+    $this->drupalLogin($this->webUser);
+
+    // As the web user, fill in the comment form and preview the comment.
+    $edit = [];
+    $edit['subject[0][value]'] = $this->randomMachineName(8);
+    $edit['comment_body[0][value]'] = $this->randomMachineName(16);
+    $this->drupalPostForm('node/' . $this->node->id(), $edit, t('Preview'));
+
+    // Check that the preview is displaying the title and body.
+    $this->assertTitle(t('Preview comment | Drupal'), 'Page title is "Preview comment".');
+    $this->assertText($edit['subject[0][value]'], 'Subject displayed.');
+    $this->assertText($edit['comment_body[0][value]'], 'Comment displayed.');
+
+    // Check that the title and body fields are displayed with the correct values.
+    $this->assertFieldByName('subject[0][value]', $edit['subject[0][value]'], 'Subject field displayed.');
+    $this->assertFieldByName('comment_body[0][value]', $edit['comment_body[0][value]'], 'Comment field displayed.');
+
+    // Store the content of this page.
+    $content = $this->getRawContent();
+    $this->drupalPostForm(NULL, [], 'Save');
+    $this->assertText('Your comment has been posted.');
+    $elements = $this->xpath('//section[contains(@class, "comment-wrapper")]/article');
+    $this->assertEqual(1, count($elements));
+
+    // Reset the content of the page to simulate the browser's back button, and
+    // re-submit the form.
+    $this->setRawContent($content);
+    $this->drupalPostForm(NULL, [], 'Save');
+    $this->assertText('Your comment has been posted.');
+    $elements = $this->xpath('//section[contains(@class, "comment-wrapper")]/article');
+    $this->assertEqual(2, count($elements));
+  }
+
+  /**
+   * Tests comment edit, preview, and save.
+   */
+  public function testCommentEditPreviewSave() {
+    $web_user = $this->drupalCreateUser(['access comments', 'post comments', 'skip comment approval', 'edit own comments']);
+    $this->drupalLogin($this->adminUser);
+    $this->setCommentPreview(DRUPAL_OPTIONAL);
+    $this->setCommentForm(TRUE);
+    $this->setCommentSubject(TRUE);
+    $this->setCommentSettings('default_mode', CommentManagerInterface::COMMENT_MODE_THREADED, 'Comment paging changed.');
+
+    $edit = [];
+    $date = new DrupalDateTime('2008-03-02 17:23');
+    $edit['subject[0][value]'] = $this->randomMachineName(8);
+    $edit['comment_body[0][value]'] = $this->randomMachineName(16);
+    $edit['uid'] = $web_user->getUsername() . ' (' . $web_user->id() . ')';
+    $edit['date[date]'] = $date->format('Y-m-d');
+    $edit['date[time]'] = $date->format('H:i:s');
+    $raw_date = $date->getTimestamp();
+    $expected_text_date = format_date($raw_date);
+    $expected_form_date = $date->format('Y-m-d');
+    $expected_form_time = $date->format('H:i:s');
+    $comment = $this->postComment($this->node, $edit['subject[0][value]'], $edit['comment_body[0][value]'], TRUE);
+    $this->drupalPostForm('comment/' . $comment->id() . '/edit', $edit, t('Preview'));
+
+    // Check that the preview is displaying the subject, comment, author and date correctly.
+    $this->assertTitle(t('Preview comment | Drupal'), 'Page title is "Preview comment".');
+    $this->assertText($edit['subject[0][value]'], 'Subject displayed.');
+    $this->assertText($edit['comment_body[0][value]'], 'Comment displayed.');
+    $this->assertText($web_user->getUsername(), 'Author displayed.');
+    $this->assertText($expected_text_date, 'Date displayed.');
+
+    // Check that the subject, comment, author and date fields are displayed with the correct values.
+    $this->assertFieldByName('subject[0][value]', $edit['subject[0][value]'], 'Subject field displayed.');
+    $this->assertFieldByName('comment_body[0][value]', $edit['comment_body[0][value]'], 'Comment field displayed.');
+    $this->assertFieldByName('uid', $edit['uid'], 'Author field displayed.');
+    $this->assertFieldByName('date[date]', $edit['date[date]'], 'Date field displayed.');
+    $this->assertFieldByName('date[time]', $edit['date[time]'], 'Time field displayed.');
+
+    // Check that saving a comment produces a success message.
+    $this->drupalPostForm('comment/' . $comment->id() . '/edit', $edit, t('Save'));
+    $this->assertText(t('Your comment has been posted.'), 'Comment posted.');
+
+    // Check that the comment fields are correct after loading the saved comment.
+    $this->drupalGet('comment/' . $comment->id() . '/edit');
+    $this->assertFieldByName('subject[0][value]', $edit['subject[0][value]'], 'Subject field displayed.');
+    $this->assertFieldByName('comment_body[0][value]', $edit['comment_body[0][value]'], 'Comment field displayed.');
+    $this->assertFieldByName('uid', $edit['uid'], 'Author field displayed.');
+    $this->assertFieldByName('date[date]', $expected_form_date, 'Date field displayed.');
+    $this->assertFieldByName('date[time]', $expected_form_time, 'Time field displayed.');
+
+    // Submit the form using the displayed values.
+    $displayed = [];
+    $displayed['subject[0][value]'] = (string) current($this->xpath("//input[@id='edit-subject-0-value']/@value"));
+    $displayed['comment_body[0][value]'] = (string) current($this->xpath("//textarea[@id='edit-comment-body-0-value']"));
+    $displayed['uid'] = (string) current($this->xpath("//input[@id='edit-uid']/@value"));
+    $displayed['date[date]'] = (string) current($this->xpath("//input[@id='edit-date-date']/@value"));
+    $displayed['date[time]'] = (string) current($this->xpath("//input[@id='edit-date-time']/@value"));
+    $this->drupalPostForm('comment/' . $comment->id() . '/edit', $displayed, t('Save'));
+
+    // Check that the saved comment is still correct.
+    $comment_storage = \Drupal::entityManager()->getStorage('comment');
+    $comment_storage->resetCache([$comment->id()]);
+    /** @var \Drupal\comment\CommentInterface $comment_loaded */
+    $comment_loaded = Comment::load($comment->id());
+    $this->assertEqual($comment_loaded->getSubject(), $edit['subject[0][value]'], 'Subject loaded.');
+    $this->assertEqual($comment_loaded->comment_body->value, $edit['comment_body[0][value]'], 'Comment body loaded.');
+    $this->assertEqual($comment_loaded->getOwner()->id(), $web_user->id(), 'Name loaded.');
+    $this->assertEqual($comment_loaded->getCreatedTime(), $raw_date, 'Date loaded.');
+    $this->drupalLogout();
+
+    // Check that the date and time of the comment are correct when edited by
+    // non-admin users.
+    $user_edit = [];
+    $expected_created_time = $comment_loaded->getCreatedTime();
+    $this->drupalLogin($web_user);
+    // Web user cannot change the comment author.
+    unset($edit['uid']);
+    $this->drupalPostForm('comment/' . $comment->id() . '/edit', $user_edit, t('Save'));
+    $comment_storage->resetCache([$comment->id()]);
+    $comment_loaded = Comment::load($comment->id());
+    $this->assertEqual($comment_loaded->getCreatedTime(), $expected_created_time, 'Expected date and time for comment edited.');
+    $this->drupalLogout();
+  }
+
+}