Update helpers.js

You might need to pass more parameters in role if you extend built-in role model

Author: vladmiller

lib/helpers.js

@@ -128,6 +128,11 @@ _beforeEach.givenUser = function(attrs, optionalHandler) {
 } 
 
 _beforeEach.givenUserWithRole = function (attrs, role, optionalHandler) {
+  if (typeof role === 'string') {
+    role = {
+      name: role
+    }
+  }
   _beforeEach.givenUser(attrs, function (done) {
     var test = this;
     test.app.models.Role.create({name: role}, function (err, result) {