skip test cases for not-found record

open issue in ember.js emberjs/ember.js#12791

tests/acceptance/not-found-test.js

@@ -1,6 +1,7 @@
 import Ember from 'ember';
 import startApp from '../helpers/start-app';
 import FactoryGuy from 'ember-data-factory-guy';
+import testSkip from '../helpers/test-skip';
 
 var App, offer, t;
 
@@ -18,7 +19,10 @@ module('Display not found error', {
   }
 });
 
-test("Display error popup for invalid offer", function() {
+// Test cases with responses as error-statuscodes fails
+// https://github.com/emberjs/ember.js/issues/12791
+
+testSkip("Display error popup for invalid offer", function() {
   $('.reveal-modal').remove();
   visit("/offers/invalid/offer_details");
 
@@ -28,7 +32,7 @@ test("Display error popup for invalid offer", function() {
   });
 });
 
-test("Display error popup for invalid item", function() {
+testSkip("Display error popup for invalid item", function() {
   $('.reveal-modal').remove();
   visit("/offers/" + offer.id + "/items/invalid/messages");
   $.mockjax({url:"/api/v1/items/*",status:404});