Add block scoping to challenges url

common/app/routes/challenges/utils.js

@@ -61,7 +61,7 @@ export function getFileKey({ challengeType }) {
 export function createTests({ tests = [] }) {
   return tests
     .map(test => ({
-      text: test.split('message: ').pop().replace(/\'\);/g, ''),
+      text: ('' + test).split('message: ').pop().replace(/\'\);/g, ''),
       testString: test
     }));
 }