diff --git a/core/modules/filter/src/Tests/FilterCrudTest.php b/core/modules/filter/src/Tests/FilterCrudTest.php
index 55fe64d..00a25fc 100644
--- a/core/modules/filter/src/Tests/FilterCrudTest.php
+++ b/core/modules/filter/src/Tests/FilterCrudTest.php
@@ -79,15 +79,13 @@ function testTextFormatCrud() {
    */
   public function testDisableFallbackFormat() {
     $this->installConfig(['filter']);
-    $message = "Exception \\LogicException (message \"The fallback text format 'plain_text' cannot be disabled.\") was thrown.";
+    $message = '\LogicException with message "The fallback text format \'plain_text\' cannot be disabled." was thrown.';
     try {
       FilterFormat::load('plain_text')->disable();
       $this->fail($message);
     }
     catch (\LogicException $e) {
-      if ($e->getMessage() == "The fallback text format 'plain_text' cannot be disabled.") {
-        $this->pass($message);
-      }
+      $this->assertIdentical($e->getMessage(), "The fallback text format 'plain_text' cannot be disabled.", $message);
     }
   }