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diff --git a/web/core/modules/comment/tests/src/Functional/CommentBlockTest.php b/web/core/modules/comment/tests/src/Functional/CommentBlockTest.php
new file mode 100644
index 000000000..db7d1bd82
--- /dev/null
+++ b/web/core/modules/comment/tests/src/Functional/CommentBlockTest.php
@@ -0,0 +1,90 @@
+<?php
+
+namespace Drupal\Tests\comment\Functional;
+
+use Drupal\Component\Utility\SafeMarkup;
+use Drupal\user\RoleInterface;
+
+/**
+ * Tests comment block functionality.
+ *
+ * @group comment
+ */
+class CommentBlockTest extends CommentTestBase {
+
+  /**
+   * Modules to install.
+   *
+   * @var array
+   */
+  public static $modules = ['block', 'views'];
+
+  protected function setUp() {
+    parent::setUp();
+    // Update admin user to have the 'administer blocks' permission.
+    $this->adminUser = $this->drupalCreateUser([
+      'administer content types',
+      'administer comments',
+      'skip comment approval',
+      'post comments',
+      'access comments',
+      'access content',
+      'administer blocks',
+     ]);
+  }
+
+  /**
+   * Tests the recent comments block.
+   */
+  public function testRecentCommentBlock() {
+    $this->drupalLogin($this->adminUser);
+    $block = $this->drupalPlaceBlock('views_block:comments_recent-block_1');
+
+    // Add some test comments, with and without subjects. Because the 10 newest
+    // comments should be shown by the block, we create 11 to test that behavior
+    // below.
+    $timestamp = REQUEST_TIME;
+    for ($i = 0; $i < 11; ++$i) {
+      $subject = ($i % 2) ? $this->randomMachineName() : '';
+      $comments[$i] = $this->postComment($this->node, $this->randomMachineName(), $subject);
+      $comments[$i]->created->value = $timestamp--;
+      $comments[$i]->save();
+    }
+
+    // Test that a user without the 'access comments' permission cannot see the
+    // block.
+    $this->drupalLogout();
+    user_role_revoke_permissions(RoleInterface::ANONYMOUS_ID, ['access comments']);
+    $this->drupalGet('');
+    $this->assertNoText(t('Recent comments'));
+    user_role_grant_permissions(RoleInterface::ANONYMOUS_ID, ['access comments']);
+
+    // Test that a user with the 'access comments' permission can see the
+    // block.
+    $this->drupalLogin($this->webUser);
+    $this->drupalGet('');
+    $this->assertText(t('Recent comments'));
+
+    // Test the only the 10 latest comments are shown and in the proper order.
+    $this->assertNoText($comments[10]->getSubject(), 'Comment 11 not found in block.');
+    for ($i = 0; $i < 10; $i++) {
+      $this->assertText($comments[$i]->getSubject(), SafeMarkup::format('Comment @number found in block.', ['@number' => 10 - $i]));
+      if ($i > 1) {
+        $previous_position = $position;
+        $position = strpos($this->getRawContent(), $comments[$i]->getSubject());
+        $this->assertTrue($position > $previous_position, SafeMarkup::format('Comment @a appears after comment @b', ['@a' => 10 - $i, '@b' => 11 - $i]));
+      }
+      $position = strpos($this->getRawContent(), $comments[$i]->getSubject());
+    }
+
+    // Test that links to comments work when comments are across pages.
+    $this->setCommentsPerPage(1);
+
+    for ($i = 0; $i < 10; $i++) {
+      $this->clickLink($comments[$i]->getSubject());
+      $this->assertText($comments[$i]->getSubject(), 'Comment link goes to correct page.');
+      $this->assertRaw('<link rel="canonical"', 'Canonical URL was found in the HTML head');
+    }
+  }
+
+}