test: add regex check in test-vm-is-context

Jeyanthinath · lpinca · commit bc05436a891d · 2017-05-05T09:35:01.000+02:00
Use a regex to validate the error message. PR-URL: #12785 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: James M Snell <jasnell@gmail.com>
diff --git a/test/parallel/test-vm-is-context.js b/test/parallel/test-vm-is-context.js
@@ -26,7 +26,7 @@ const vm = require('vm');
 
 assert.throws(function() {
   vm.isContext('string is not supported');
-}, TypeError);
+}, /^TypeError: sandbox must be an object$/);
 
 assert.strictEqual(vm.isContext({}), false);
 assert.strictEqual(vm.isContext([]), false);
