fixed linting issue

@@ -688,9 +688,7 @@ Tester.prototype.assertRaises =
 Tester.prototype.assertRaise =
 Tester.prototype.assertThrows = function assertRaises(fn, args, message) {
     "use strict";
-    var thrown = false,
-        error = undefined,
-        context = {
+    var error, thrown = false, context = {
         type: "assertRaises",
         standard: "Function raises an error"
     };