diff -u b/core/modules/block/tests/src/Functional/BlockTest.php b/core/modules/block/tests/src/Functional/BlockTest.php
--- b/core/modules/block/tests/src/Functional/BlockTest.php
+++ b/core/modules/block/tests/src/Functional/BlockTest.php
@@ -253,7 +253,7 @@
     $theme_settings = $this->config('system.theme');
     foreach (['bartik', 'seven', 'stark'] as $theme) {
       $this->drupalGet('admin/structure/block/list/' . $theme);
-      $this->assertSession()->titleEquals(t('Block layout') . ' | Drupal');
+      $this->assertSession()->titleEquals((string) t('Block layout') . ' | Drupal');
       // Select the 'Powered by Drupal' block to be placed.
       $block = [];
       $block['id'] = strtolower($this->randomMachineName());
diff -u b/core/modules/block_content/tests/src/Functional/BlockContentListTest.php b/core/modules/block_content/tests/src/Functional/BlockContentListTest.php
--- b/core/modules/block_content/tests/src/Functional/BlockContentListTest.php
+++ b/core/modules/block_content/tests/src/Functional/BlockContentListTest.php
@@ -35,7 +35,7 @@
     $this->drupalGet('admin/structure/block/block-content');
 
     // Test for the page title.
-    $this->assertSession()->titleEquals(t('Custom block library') . ' | Drupal');
+    $this->assertSession()->titleEquals((string) t('Custom block library') . ' | Drupal');
 
     // Test for the table.
     $element = $this->xpath('//div[@class="layout-content"]//table');
diff -u b/core/modules/block_content/tests/src/Functional/BlockContentListViewsTest.php b/core/modules/block_content/tests/src/Functional/BlockContentListViewsTest.php
--- b/core/modules/block_content/tests/src/Functional/BlockContentListViewsTest.php
+++ b/core/modules/block_content/tests/src/Functional/BlockContentListViewsTest.php
@@ -38,7 +38,7 @@
     $this->drupalGet('admin/structure/block/block-content');
 
     // Test for the page title.
-    $this->assertSession()->titleEquals(t('Custom block library') . ' | Drupal');
+    $this->assertSession()->titleEquals((string) t('Custom block library') . ' | Drupal');
 
     // Test for the exposed filters.
     $this->assertFieldByName('info');
diff -u b/core/modules/block_content/tests/src/Functional/BlockContentTypeTest.php b/core/modules/block_content/tests/src/Functional/BlockContentTypeTest.php
--- b/core/modules/block_content/tests/src/Functional/BlockContentTypeTest.php
+++ b/core/modules/block_content/tests/src/Functional/BlockContentTypeTest.php
@@ -121,7 +121,7 @@
       'label' => 'Bar',
     ];
     $this->drupalGet('admin/structure/block/block-content/manage/basic');
-    $this->assertSession()->titleEquals(new FormattableMarkup('Edit @type custom block type | Drupal', ['@type' => 'basic']));
+    $this->assertSession()->titleEquals((string) new FormattableMarkup('Edit @type custom block type | Drupal', ['@type' => 'basic']));
     $this->drupalPostForm(NULL, $edit, t('Save'));
     $front_page_path = Url::fromRoute('<front>')->toString();
     $this->assertBreadcrumb('admin/structure/block/block-content/manage/basic/fields', [
diff -u b/core/modules/comment/tests/src/Functional/CommentInterfaceTest.php b/core/modules/comment/tests/src/Functional/CommentInterfaceTest.php
--- b/core/modules/comment/tests/src/Functional/CommentInterfaceTest.php
+++ b/core/modules/comment/tests/src/Functional/CommentInterfaceTest.php
@@ -97,7 +97,7 @@
     $this->setCommentPreview(DRUPAL_OPTIONAL);
 
     $this->drupalGet('comment/' . $comment->id() . '/edit');
-    $this->assertSession()->titleEquals(t('Edit comment @title | Drupal', [
+    $this->assertSession()->titleEquals((string) t('Edit comment @title | Drupal', [
       '@title' => $comment->getSubject(),
     ]));
 
diff -u b/core/modules/comment/tests/src/Functional/CommentPreviewTest.php b/core/modules/comment/tests/src/Functional/CommentPreviewTest.php
--- b/core/modules/comment/tests/src/Functional/CommentPreviewTest.php
+++ b/core/modules/comment/tests/src/Functional/CommentPreviewTest.php
@@ -67,7 +67,7 @@
     $this->drupalPostForm('node/' . $this->node->id(), $edit, t('Preview'));
 
     // Check that the preview is displaying the title and body.
-    $this->assertSession()->titleEquals(t('Preview comment | Drupal'), 'Page title is "Preview comment".');
+    $this->assertSession()->titleEquals((string) 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.');
 
@@ -101,7 +101,7 @@
     $this->drupalPostForm('node/' . $this->node->id(), $edit, t('Preview'));
 
     // Check that the preview is displaying the title and body.
-    $this->assertSession()->titleEquals(t('Preview comment | Drupal'), 'Page title is "Preview comment".');
+    $this->assertSession()->titleEquals((string) 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.');
 
@@ -150,7 +150,7 @@
     $this->drupalPostForm('comment/' . $comment->id() . '/edit', $edit, t('Preview'));
 
     // Check that the preview is displaying the subject, comment, author and date correctly.
-    $this->assertSession()->titleEquals(t('Preview comment | Drupal'), 'Page title is "Preview comment".');
+    $this->assertSession()->titleEquals((string) 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->getAccountName(), 'Author displayed.');
diff -u b/core/modules/config/tests/src/Functional/ConfigImportUITest.php b/core/modules/config/tests/src/Functional/ConfigImportUITest.php
--- b/core/modules/config/tests/src/Functional/ConfigImportUITest.php
+++ b/core/modules/config/tests/src/Functional/ConfigImportUITest.php
@@ -301,7 +301,7 @@
     // Load the diff UI and verify that the diff reflects the change.
     $this->drupalGet('admin/config/development/configuration/sync/diff/' . $config_name);
     $this->assertNoRaw('&amp;nbsp;');
-    $this->assertSession()->titleEquals(new FormattableMarkup('View changes of @config_name | Drupal', ['@config_name' => $config_name]));
+    $this->assertSession()->titleEquals((string) new FormattableMarkup('View changes of @config_name | Drupal', ['@config_name' => $config_name]));
 
     // The following assertions do not use $this::assertEscaped() because
     // \Drupal\Component\Diff\DiffFormatter adds markup that signifies what has
diff -u b/core/modules/content_translation/tests/src/Functional/Views/ContentTranslationViewsUITest.php b/core/modules/content_translation/tests/src/Functional/Views/ContentTranslationViewsUITest.php
--- b/core/modules/content_translation/tests/src/Functional/Views/ContentTranslationViewsUITest.php
+++ b/core/modules/content_translation/tests/src/Functional/Views/ContentTranslationViewsUITest.php
@@ -35,7 +35,7 @@
    */
   public function testViewsUI() {
     $this->drupalGet('admin/structure/views/view/test_view/edit');
-    $this->assertSession()->titleEquals(t('@label (@table) | @site-name', ['@label' => 'Test view', '@table' => 'Views test data', '@site-name' => $this->config('system.site')->get('name')]));
+    $this->assertSession()->titleEquals((string) t('@label (@table) | @site-name', ['@label' => 'Test view', '@table' => 'Views test data', '@site-name' => $this->config('system.site')->get('name')]));
   }
 
 }
diff -u b/core/modules/file/tests/src/Functional/FileListingTest.php b/core/modules/file/tests/src/Functional/FileListingTest.php
--- b/core/modules/file/tests/src/Functional/FileListingTest.php
+++ b/core/modules/file/tests/src/Functional/FileListingTest.php
@@ -95,7 +95,7 @@
 
     $this->drupalGet('admin/content/files/usage/' . $file->id());
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertSession()->titleEquals(t('File usage information for @file | Drupal', ['@file' => $file->getFilename()]));
+    $this->assertSession()->titleEquals((string) t('File usage information for @file | Drupal', ['@file' => $file->getFilename()]));
 
     foreach ($nodes as &$node) {
       $this->drupalGet('node/' . $node->id() . '/edit');
diff -u b/core/modules/forum/tests/src/Functional/ForumTest.php b/core/modules/forum/tests/src/Functional/ForumTest.php
--- b/core/modules/forum/tests/src/Functional/ForumTest.php
+++ b/core/modules/forum/tests/src/Functional/ForumTest.php
@@ -246,12 +246,12 @@
     // Test the root forum page title change.
     $this->drupalGet('forum');
     $this->assertCacheTag('config:taxonomy.vocabulary.' . $this->forum['vid']);
-    $this->assertSession()->titleEquals(t('Forums | Drupal'));
+    $this->assertSession()->titleEquals((string) t('Forums | Drupal'));
     $vocabulary = Vocabulary::load($this->forum['vid']);
     $vocabulary->set('name', 'Discussions');
     $vocabulary->save();
     $this->drupalGet('forum');
-    $this->assertSession()->titleEquals(t('Discussions | Drupal'));
+    $this->assertSession()->titleEquals((string) t('Discussions | Drupal'));
 
     // Test anonymous action link.
     $this->drupalLogout();
@@ -620,7 +620,7 @@
     $this->drupalGet('admin/help/forum');
     $this->assertSession()->statusCodeEquals($response2);
     if ($response2 == 200) {
-      $this->assertSession()->titleEquals(t('Forum | Drupal'), 'Forum help title was displayed');
+      $this->assertSession()->titleEquals((string) t('Forum | Drupal'), 'Forum help title was displayed');
       $this->assertText(t('Forum'), 'Forum help node was displayed');
     }
 
diff -u b/core/modules/image/tests/src/Functional/ImageAdminStylesTest.php b/core/modules/image/tests/src/Functional/ImageAdminStylesTest.php
--- b/core/modules/image/tests/src/Functional/ImageAdminStylesTest.php
+++ b/core/modules/image/tests/src/Functional/ImageAdminStylesTest.php
@@ -216,7 +216,7 @@
 
     // Check that the URL was updated.
     $this->drupalGet($style_path);
-    $this->assertSession()->titleEquals(t('Edit style @name | Drupal', ['@name' => $style_label]));
+    $this->assertSession()->titleEquals((string) t('Edit style @name | Drupal', ['@name' => $style_label]));
 
     // Check that the available image effects are properly sorted.
     $option = $this->xpath('//select[@id=:id]//option', [':id' => 'edit-new--2']);
diff -u b/core/modules/language/tests/src/Functional/LanguageListTest.php b/core/modules/language/tests/src/Functional/LanguageListTest.php
--- b/core/modules/language/tests/src/Functional/LanguageListTest.php
+++ b/core/modules/language/tests/src/Functional/LanguageListTest.php
@@ -93,7 +93,7 @@
     // Ensure 'Edit' link works.
     $this->drupalGet('admin/config/regional/language');
     $this->clickLink(t('Edit'));
-    $this->assertSession()->titleEquals(t('Edit language | Drupal'), 'Page title is "Edit language".');
+    $this->assertSession()->titleEquals((string) t('Edit language | Drupal'), 'Page title is "Edit language".');
     // Edit a language.
     $name = $this->randomMachineName(16);
     $edit = [
diff -u b/core/modules/menu_ui/tests/src/Functional/MenuUiTest.php b/core/modules/menu_ui/tests/src/Functional/MenuUiTest.php
--- b/core/modules/menu_ui/tests/src/Functional/MenuUiTest.php
+++ b/core/modules/menu_ui/tests/src/Functional/MenuUiTest.php
@@ -709,7 +709,7 @@
       // Verify menu link link.
       $this->clickLink($title);
       $title = $parent_node->label();
-      $this->assertSession()->titleEquals(t("@title | Drupal", ['@title' => $title]), 'Parent menu link link target was correct');
+      $this->assertSession()->titleEquals((string) t("@title | Drupal", ['@title' => $title]), 'Parent menu link link target was correct');
     }
 
     // Verify menu link.
@@ -719,7 +719,7 @@
     // Verify menu link link.
     $this->clickLink($title);
     $title = $item_node->label();
-    $this->assertSession()->titleEquals(t("@title | Drupal", ['@title' => $title]), 'Menu link link target was correct');
+    $this->assertSession()->titleEquals((string) t("@title | Drupal", ['@title' => $title]), 'Menu link link target was correct');
   }
 
   /**
diff -u b/core/modules/node/tests/src/Functional/PagePreviewTest.php b/core/modules/node/tests/src/Functional/PagePreviewTest.php
--- b/core/modules/node/tests/src/Functional/PagePreviewTest.php
+++ b/core/modules/node/tests/src/Functional/PagePreviewTest.php
@@ -440,7 +440,7 @@
     $this->drupalPostForm('node/add/page', $edit, t('Preview'));
 
     // Check that the preview is displaying the title, body and term.
-    $this->assertSession()->titleEquals(t('@title | Drupal', ['@title' => $edit[$title_key]]), 'Basic page title is preview.');
+    $this->assertSession()->titleEquals((string) t('@title | Drupal', ['@title' => $edit[$title_key]]), 'Basic page title is preview.');
     $this->assertText($edit[$title_key], 'Title displayed.');
     $this->assertText($edit[$body_key], 'Body displayed.');
     $this->assertText($edit[$term_key], 'Term displayed.');
diff -u b/core/modules/search/tests/src/Functional/SearchPageTextTest.php b/core/modules/search/tests/src/Functional/SearchPageTextTest.php
--- b/core/modules/search/tests/src/Functional/SearchPageTextTest.php
+++ b/core/modules/search/tests/src/Functional/SearchPageTextTest.php
@@ -77,7 +77,7 @@
     $this->assertText('search yielded no results');
     $this->assertText(t('Search'));
     $title_source = 'Search for @keywords | Drupal';
-    $this->assertSession()->titleEquals(t($title_source, ['@keywords' => Unicode::truncate($search_terms, 60, TRUE, TRUE)]), 'Search page title is correct');
+    $this->assertSession()->titleEquals((string) t($title_source, ['@keywords' => Unicode::truncate($search_terms, 60, TRUE, TRUE)]), 'Search page title is correct');
     $this->assertNoText('Node', 'Erroneous tab and breadcrumb text is not present');
     $this->assertNoText(t('Node'), 'Erroneous translated tab and breadcrumb text is not present');
     $this->assertText(t('Content'), 'Tab and breadcrumb text is present');
@@ -91,7 +91,7 @@
     $search_terms = 'Every word is like an unnecessary stain on silence and nothingness.';
     $edit['keys'] = $search_terms;
     $this->drupalPostForm('search/node', $edit, t('Search'));
-    $this->assertSession()->titleEquals(t($title_source, ['@keywords' => 'Every word is like an unnecessary stain on silence and…']), 'Search page title is correct');
+    $this->assertSession()->titleEquals((string) t($title_source, ['@keywords' => 'Every word is like an unnecessary stain on silence and…']), 'Search page title is correct');
 
     // Search for a string with a lot of special characters.
     $search_terms = 'Hear nothing > "see nothing" `feel' . " '1982.";
@@ -103,7 +103,7 @@
     $edit['keys'] = $this->searchingUser->getAccountName();
     $this->drupalPostForm('search/user', $edit, t('Search'));
     $this->assertText(t('Search'));
-    $this->assertSession()->titleEquals(t($title_source, ['@keywords' => Unicode::truncate($this->searchingUser->getAccountName(), 60, TRUE, TRUE)]));
+    $this->assertSession()->titleEquals((string) t($title_source, ['@keywords' => Unicode::truncate($this->searchingUser->getAccountName(), 60, TRUE, TRUE)]));
 
     $this->clickLink('Search help');
     $this->assertText('Search help', 'Correct title is on search help page');
diff -u b/core/modules/system/tests/src/Functional/Form/ConfirmFormTest.php b/core/modules/system/tests/src/Functional/Form/ConfirmFormTest.php
--- b/core/modules/system/tests/src/Functional/Form/ConfirmFormTest.php
+++ b/core/modules/system/tests/src/Functional/Form/ConfirmFormTest.php
@@ -29,7 +29,7 @@
     // Test the building of the form.
     $this->drupalGet('form-test/confirm-form');
     $site_name = $this->config('system.site')->get('name');
-    $this->assertSession()->titleEquals(t('ConfirmFormTestForm::getQuestion(). | @site-name', ['@site-name' => $site_name]), 'The question was found as the page title.');
+    $this->assertSession()->titleEquals((string) t('ConfirmFormTestForm::getQuestion(). | @site-name', ['@site-name' => $site_name]), 'The question was found as the page title.');
     $this->assertText(t('ConfirmFormTestForm::getDescription().'), 'The description was used.');
     $this->assertFieldByXPath('//input[@id="edit-submit"]', t('ConfirmFormTestForm::getConfirmText().'), 'The confirm text was used.');
 
diff -u b/core/modules/taxonomy/tests/src/Functional/VocabularyUiTest.php b/core/modules/taxonomy/tests/src/Functional/VocabularyUiTest.php
--- b/core/modules/taxonomy/tests/src/Functional/VocabularyUiTest.php
+++ b/core/modules/taxonomy/tests/src/Functional/VocabularyUiTest.php
@@ -81,7 +81,7 @@
     $this->drupalPostForm('admin/structure/taxonomy/add', $edit, t('Save'));
 
     $site_name = $this->config('system.site')->get('name');
-    $this->assertSession()->titleEquals(t("Don't Panic | @site-name", ['@site-name' => $site_name]), 'The page title contains the escaped character.');
+    $this->assertSession()->titleEquals((string) t("Don't Panic | @site-name", ['@site-name' => $site_name]), 'The page title contains the escaped character.');
   }
 
   /**
diff -u b/core/modules/tracker/tests/src/Functional/TrackerTest.php b/core/modules/tracker/tests/src/Functional/TrackerTest.php
--- b/core/modules/tracker/tests/src/Functional/TrackerTest.php
+++ b/core/modules/tracker/tests/src/Functional/TrackerTest.php
@@ -212,7 +212,7 @@
     $this->assertNoLink($unpublished->label());
     // Verify that title and tab title have been set correctly.
     $this->assertText('Activity', 'The user activity tab has the name "Activity".');
-    $this->assertSession()->titleEquals(t('@name | @site', ['@name' => $this->user->getAccountName(), '@site' => $this->config('system.site')->get('name')]), 'The user tracker page has the correct page title.');
+    $this->assertSession()->titleEquals((string) t('@name | @site', ['@name' => $this->user->getAccountName(), '@site' => $this->config('system.site')->get('name')]), 'The user tracker page has the correct page title.');
 
     // Verify that unpublished comments are removed from the tracker.
     $admin_user = $this->drupalCreateUser(['post comments', 'administer comments', 'access user profiles']);
diff -u b/core/modules/user/tests/src/Functional/UserPasswordResetTest.php b/core/modules/user/tests/src/Functional/UserPasswordResetTest.php
--- b/core/modules/user/tests/src/Functional/UserPasswordResetTest.php
+++ b/core/modules/user/tests/src/Functional/UserPasswordResetTest.php
@@ -105,12 +105,12 @@
     // Check the one-time login page.
     $this->assertText($this->account->getAccountName(), 'One-time login page contains the correct username.');
     $this->assertText(t('This login can be used only once.'), 'Found warning about one-time login.');
-    $this->assertSession()->titleEquals(t('Reset password | Drupal'), 'Page title is "Reset password".');
+    $this->assertSession()->titleEquals((string) t('Reset password | Drupal'), 'Page title is "Reset password".');
 
     // Check successful login.
     $this->drupalPostForm(NULL, NULL, t('Log in'));
     $this->assertLink(t('Log out'));
-    $this->assertSession()->titleEquals(t('@name | @site', ['@name' => $this->account->getAccountName(), '@site' => $this->config('system.site')->get('name')]), 'Logged in using password reset link.');
+    $this->assertSession()->titleEquals((string) t('@name | @site', ['@name' => $this->account->getAccountName(), '@site' => $this->config('system.site')->get('name')]), 'Logged in using password reset link.');
 
     // Change the forgotten password.
     $password = user_password();
@@ -189,7 +189,7 @@
     $reset_url = $this->getResetURL();
     $this->drupalGet($reset_url . '/login');
     $this->assertLink(t('Log out'));
-    $this->assertSession()->titleEquals(t('@name | @site', ['@name' => $this->account->getAccountName(), '@site' => $this->config('system.site')->get('name')]), 'Logged in using password reset link.');
+    $this->assertSession()->titleEquals((string) t('@name | @site', ['@name' => $this->account->getAccountName(), '@site' => $this->config('system.site')->get('name')]), 'Logged in using password reset link.');
 
     // Ensure blocked and deleted accounts can't access the user.reset.login
     // route.
@@ -359,7 +359,7 @@
     $reset_url = $this->getResetURL();
     $this->drupalGet($reset_url . '/login');
     $this->assertLink(t('Log out'));
-    $this->assertSession()->titleEquals(t('@name | @site', ['@name' => $this->account->getAccountName(), '@site' => $this->config('system.site')->get('name')]), 'Logged in using password reset link.');
+    $this->assertSession()->titleEquals((string) t('@name | @site', ['@name' => $this->account->getAccountName(), '@site' => $this->config('system.site')->get('name')]), 'Logged in using password reset link.');
     $this->drupalLogout();
 
     // The next request should *not* trigger flood control, since a successful
diff -u b/core/modules/user/tests/src/Functional/UserRegistrationTest.php b/core/modules/user/tests/src/Functional/UserRegistrationTest.php
--- b/core/modules/user/tests/src/Functional/UserRegistrationTest.php
+++ b/core/modules/user/tests/src/Functional/UserRegistrationTest.php
@@ -55,7 +55,7 @@
     $this->assertTrue($new_user->isActive(), 'New account is active after registration.');
     $resetURL = user_pass_reset_url($new_user);
     $this->drupalGet($resetURL);
-    $this->assertSession()->titleEquals(t('Set password | Drupal'), 'Page title is "Set password".');
+    $this->assertSession()->titleEquals((string) t('Set password | Drupal'), 'Page title is "Set password".');
 
     // Allow registration by site visitors, but require administrator approval.
     $config->set('register', UserInterface::REGISTER_VISITORS_ADMINISTRATIVE_APPROVAL)->save();
diff -u b/core/modules/views/tests/src/Functional/Plugin/DisplayPageWebTest.php b/core/modules/views/tests/src/Functional/Plugin/DisplayPageWebTest.php
--- b/core/modules/views/tests/src/Functional/Plugin/DisplayPageWebTest.php
+++ b/core/modules/views/tests/src/Functional/Plugin/DisplayPageWebTest.php
@@ -99,7 +99,7 @@
       ':a_class' => 'is-active',
     ]);
     $this->assertEqual($element[0]->getText(), t('Test default tab'));
-    $this->assertSession()->titleEquals(t('Test default page | Drupal'));
+    $this->assertSession()->titleEquals((string) t('Test default page | Drupal'));
 
     $this->drupalGet('test_page_display_menu/default');
     $this->assertSession()->statusCodeEquals(404);
@@ -111,7 +111,7 @@
       ':a_class' => 'is-active',
     ]);
     $this->assertEqual($element[0]->getText(), t('Test local tab'));
-    $this->assertSession()->titleEquals(t('Test local page | Drupal'));
+    $this->assertSession()->titleEquals((string) t('Test local page | Drupal'));
 
     // Check an ordinary menu link.
     $admin_user = $this->drupalCreateUser(['administer menu']);
diff -u b/core/modules/views_ui/tests/src/Functional/DefaultViewsTest.php b/core/modules/views_ui/tests/src/Functional/DefaultViewsTest.php
--- b/core/modules/views_ui/tests/src/Functional/DefaultViewsTest.php
+++ b/core/modules/views_ui/tests/src/Functional/DefaultViewsTest.php
@@ -93,7 +93,7 @@
     $edit = [
       'id' => 'duplicate_of_glossary',
     ];
-    $this->assertSession()->titleEquals(t('Duplicate of @label | @site-name', ['@label' => 'Glossary', '@site-name' => $this->config('system.site')->get('name')]));
+    $this->assertSession()->titleEquals((string) t('Duplicate of @label | @site-name', ['@label' => 'Glossary', '@site-name' => $this->config('system.site')->get('name')]));
     $this->drupalPostForm(NULL, $edit, t('Duplicate'));
     $this->assertUrl('admin/structure/views/view/duplicate_of_glossary', [], 'The normal duplicating name schema is applied.');
 
reverted:
--- b/core/tests/Drupal/FunctionalTests/BrowserTestBaseTest.php
+++ a/core/tests/Drupal/FunctionalTests/BrowserTestBaseTest.php
@@ -249,17 +249,6 @@
     $this->assertResponse(200);
   }
 
-  /**
-   * Tests legacy assertTitle().
-   *
-   * @group legacy
-   * @expectedDeprecation AssertLegacyTrait::assertTitle() is deprecated in drupal:8.2.0 and is removed from drupal:10.0.0. Use $this->assertSession()->titleEquals() instead. See https://www.drupal.org/node/3129738
-   */
-  public function testAssertTitle() {
-    $this->drupalGet('test-encoded');
-    $this->assertTitle("Page with encoded HTML | Drupal");
-  }
-
   /**
    * Tests legacy text asserts.
    */