Fixed Promise shim usage in VastChainer

Author: Gidi & Petrut

src/js/vastChainer.js

@@ -22,11 +22,11 @@ function domainAllowsCorsCookies(vastConfig, url) {
 
 module.exports = function(
     {
-        promiseModule = promiseShim,
+        PromiseModule = Promise,
         $ = jQuery,
         parseVast = vastParser.parse,
         Response = VastResponse
-    }) {
+    } = {}) {
 
     var vastRequestCounter = 0,
         dispatcher = $({});
@@ -40,7 +40,7 @@ module.exports = function(
         var url = vastConfig.url,
             resolve,
             reject,
-            promise = new promiseModule.Promise(function(_resolve, _reject) {
+            promise = new PromiseModule(function(_resolve, _reject) {
 
                 resolve = _resolve;
                 reject = _reject;

test/specs/vastChainerSpec.js

@@ -40,11 +40,9 @@ describe('VAST Chainer', function(){
             resolve: sinon.stub()
         };
 
-        let promiseModule = {
-            Promise: function(callback) {
-                callback(mockDeferred.resolve, mockDeferred.reject);
-                return mockPromise;
-            }
+        let PromiseModule = function(callback) {
+            callback(mockDeferred.resolve, mockDeferred.reject);
+            return mockPromise;
         };
 
         mockDispatcher = {
@@ -98,7 +96,7 @@ describe('VAST Chainer', function(){
         };
 
         mockDeps = {
-            promiseModule,
+            PromiseModule,
             $,
             parseVast
         };