diff -u b/core/modules/config/lib/Drupal/config/Tests/ConfigExportImportUITest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigExportImportUITest.php
--- b/core/modules/config/lib/Drupal/config/Tests/ConfigExportImportUITest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigExportImportUITest.php
@@ -132,7 +132,7 @@
   }
 
   /**
-   * Tests a warning appears when unsynchronized changes exist..
+   * Tests that a warning appears when unsynchronized changes exist.
    */
   public function testImportWarning() {
     $new_slogan = $this->randomName(16);
@@ -141,10 +141,7 @@
       ->save();
 
     $this->drupalGet('admin/config/development/configuration');
-
-    $this->assertText('Changes have been made to your active configuration, which might be lost on the next import attempt. ' .
-      'You can find and review the differences between snapshot and active/staging storage here');
-
+    $this->assertText('Changes have been made to your active configuration, which might be lost on the next import attempt. You can find and review the differences between snapshot and active/staging storage here');
     $this->clickLink('Compare snapshot and active/staging storage');
     $this->assertText('View changes between snapshot and active configuration');
     $this->assertText('system.site');