diff -u b/core/modules/filter/src/Tests/FilterAdminTest.php b/core/modules/filter/src/Tests/FilterAdminTest.php
--- b/core/modules/filter/src/Tests/FilterAdminTest.php
+++ b/core/modules/filter/src/Tests/FilterAdminTest.php
@@ -294,7 +294,7 @@
     $edit['body[0][value]'] = $text;
     $edit['body[0][format]'] = $basic;
     $this->drupalPostForm('node/add/page', $edit, t('Save'));
-    $this->assertText(t('Basic page %title has been created.', array('%title' => $edit['title[0][value]'])), 'Filtered node created.');
+    $this->assertText(t('Basic page @title has been created.', array('@title' => $edit['title[0][value]'])), 'Filtered node created.');
 
     $node = $this->drupalGetNodeByTitle($edit['title[0][value]']);
     $this->assertTrue($node, 'Node found in database.');
diff -u b/core/modules/forum/src/Tests/ForumTest.php b/core/modules/forum/src/Tests/ForumTest.php
--- b/core/modules/forum/src/Tests/ForumTest.php
+++ b/core/modules/forum/src/Tests/ForumTest.php
@@ -540,12 +540,12 @@
 
     $type = t('Forum topic');
     if ($container) {
-      $this->assertNoRaw(t('@type %title has been created.', array('@type' => $type, '%title' => $title)), 'Forum topic was not created');
+      $this->assertNoText(t('@type @title has been created.', array('@type' => $type, '@title' => $title)), 'Forum topic was not created');
       $this->assertRaw(t('The item %title is a forum container, not a forum.', array('%title' => $forum['name'])), 'Error message was shown');
       return;
     }
     else {
-      $this->assertText(t('@type %title has been created.', array('@type' => $type, '%title' => $title)), 'Forum topic was created');
+      $this->assertText(t('@type @title has been created.', array('@type' => $type, '@title' => $title)), 'Forum topic was created');
       $this->assertNoRaw(t('The item %title is a forum container, not a forum.', array('%title' => $forum['name'])), 'No error message was shown');
     }
 
@@ -622,7 +622,7 @@
       $edit['taxonomy_forums'] = $this->rootForum['tid'];
       $edit['shadow'] = TRUE;
       $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Save'));
-      $this->assertText(t('Forum topic %title has been updated.', array('%title' => $edit['title[0][value]'])), 'Forum node was edited');
+      $this->assertText(t('Forum topic @title has been updated.', array('@title' => $edit['title[0][value]'])), 'Forum node was edited');
 
       // Verify topic was moved to a different forum.
       $forum_tid = db_query("SELECT tid FROM {forum} WHERE nid = :nid AND vid = :vid", array(
diff -u b/core/modules/locale/src/Tests/LocaleContentTest.php b/core/modules/locale/src/Tests/LocaleContentTest.php
--- b/core/modules/locale/src/Tests/LocaleContentTest.php
+++ b/core/modules/locale/src/Tests/LocaleContentTest.php
@@ -123,7 +123,7 @@
       'langcode[0][value]' => 'en',
     );
     $this->drupalPostForm($path, $edit, t('Save'));
-    $this->assertText(t('%title has been updated.', array('%title' => $node_title)));
+    $this->assertText(t('@title has been updated.', array('@title' => $node_title)));
 
     $this->drupalLogout();
   }
diff -u b/core/modules/node/src/Tests/NodeCreationTest.php b/core/modules/node/src/Tests/NodeCreationTest.php
--- b/core/modules/node/src/Tests/NodeCreationTest.php
+++ b/core/modules/node/src/Tests/NodeCreationTest.php
@@ -52,7 +52,7 @@
     $this->drupalPostForm('node/add/page', $edit, t('Save'));
 
     // Check that the Basic page has been created.
-    $this->assertText(t('!post %title has been created.', array('!post' => 'Basic page', '%title' => $edit['title[0][value]'])), 'Basic page created.');
+    $this->assertText(t('!post @title has been created.', array('!post' => 'Basic page', '@title' => $edit['title[0][value]'])), 'Basic page created.');
 
     // Check that the node exists in the database.
     $node = $this->drupalGetNodeByTitle($edit['title[0][value]']);
@@ -141,7 +141,7 @@
     $this->assertText(t('Test page text'));
 
     // Confirm that the node was created.
-    $this->assertText(t('!post %title has been created.', array('!post' => 'Basic page', '%title' => $edit['title[0][value]'])));
+    $this->assertText(t('!post @title has been created.', array('!post' => 'Basic page', '@title' => $edit['title[0][value]'])));
   }
 
   /**
diff -u b/core/modules/system/src/Tests/Entity/EntityTranslationFormTest.php b/core/modules/system/src/Tests/Entity/EntityTranslationFormTest.php
--- b/core/modules/system/src/Tests/Entity/EntityTranslationFormTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityTranslationFormTest.php
@@ -91,7 +91,7 @@
     $edit['body[0][value]'] = $this->randomMachineName(16);
     $edit['langcode[0][value]'] = $langcode;
     $this->drupalPostForm('node/add/page', $edit, t('Save'));
-    $this->assertText(t('Basic page %title has been created.', array('%title' => $edit['title[0][value]'])), 'Basic page created.');
+    $this->assertText(t('Basic page @title has been created.', array('@title' => $edit['title[0][value]'])), 'Basic page created.');
 
     // Check to make sure the node was created.
     $node = $this->drupalGetNodeByTitle($edit['title[0][value]']);
diff -u b/core/modules/taxonomy/src/Tests/TermTest.php b/core/modules/taxonomy/src/Tests/TermTest.php
--- b/core/modules/taxonomy/src/Tests/TermTest.php
+++ b/core/modules/taxonomy/src/Tests/TermTest.php
@@ -245,7 +245,7 @@
 
     // Save, creating the terms.
     $this->drupalPostForm('node/add/article', $edit, t('Save'));
-    $this->assertText(t('@type %title has been created.', array('@type' => t('Article'), '%title' => $edit['title[0][value]'])), 'The node was created successfully.');
+    $this->assertText(t('@type @title has been created.', array('@type' => t('Article'), '@title' => $edit['title[0][value]'])), 'The node was created successfully.');
     foreach ($terms as $term) {
       $this->assertText($term, 'The term was saved and appears on the node page.');
     }
diff -u b/core/modules/taxonomy/src/Tests/VocabularyPermissionsTest.php b/core/modules/taxonomy/src/Tests/VocabularyPermissionsTest.php
--- b/core/modules/taxonomy/src/Tests/VocabularyPermissionsTest.php
+++ b/core/modules/taxonomy/src/Tests/VocabularyPermissionsTest.php
@@ -35,7 +35,7 @@
     $edit['name[0][value]'] = $this->randomMachineName();
 
     $this->drupalPostForm(NULL, $edit, t('Save'));
-    $this->assertText(t('Created new term %name.', array('%name' => $edit['name[0][value]'])), 'Term created successfully.');
+    $this->assertText(t('Created new term @name.', array('@name' => $edit['name[0][value]'])), 'Term created successfully.');
 
     $terms = taxonomy_term_load_multiple_by_name($edit['name[0][value]']);
     $term = reset($terms);
@@ -47,7 +47,7 @@
 
     $edit['name[0][value]'] = $this->randomMachineName();
     $this->drupalPostForm(NULL, $edit, t('Save'));
-    $this->assertText(t('Updated term %name.', array('%name' => $edit['name[0][value]'])), 'Term updated successfully.');
+    $this->assertText(t('Updated term @name.', array('@name' => $edit['name[0][value]'])), 'Term updated successfully.');
 
     // Delete the vocabulary.
     $this->drupalGet('taxonomy/term/' . $term->id() . '/delete');