diff --git a/core/tests/Drupal/Tests/Component/Utility/XssTest.php b/core/tests/Drupal/Tests/Component/Utility/XssTest.php
index c61beb7..8b6434b 100644
--- a/core/tests/Drupal/Tests/Component/Utility/XssTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/XssTest.php
@@ -50,7 +50,6 @@ protected function setUp() {
     UrlValidator::setAllowedProtocols($allowed_protocols);
   }
 
-
   /**
    * Tests limiting allowed tags and XSS prevention.
    *
@@ -239,9 +238,9 @@ public function testFilterXSS() {
    */
   public function testInvalidMultiByte() {
     $text = Xss::filter("Foo\xC0barbaz");
-    $this->assertEquals($text, '', 'filter_xss() rejects invalid sequence "Foo\xC0barbaz"');
+    $this->assertEquals($text, '', 'filter_xss() accepted invalid sequence "Foo\xC0barbaz"');
     $text = Xss::filter("Fooÿñ");
-    $this->assertEquals($text, "Fooÿñ", 'filter_xss() accepts valid sequence Fooÿñ');
+    $this->assertEquals($text, "Fooÿñ", 'filter_xss() rejects valid sequence Fooÿñ');
   }
 
   /**