diff --git a/modules/adkernelAdnAnalyticsAdapter.js b/modules/adkernelAdnAnalyticsAdapter.js
index 9402f51d1b6..ab57a84f4b0 100644
--- a/modules/adkernelAdnAnalyticsAdapter.js
+++ b/modules/adkernelAdnAnalyticsAdapter.js
@@ -171,6 +171,15 @@ const DIRECT = '(direct)';
 const REFERRAL = '(referral)';
 const ORGANIC = '(organic)';
 
+export let storage = {
+  getItem: (name) => {
+    return localStorage.getItem(name);
+  },
+  setItem: (name, value) => {
+    localStorage.setItem(name, value);
+  }
+};
+
 export function getUmtSource(pageUrl, referrer) {
   let prevUtm = getPreviousTrafficSource();
   let currUtm = getCurrentTrafficSource(pageUrl, referrer);
@@ -181,7 +190,7 @@ export function getUmtSource(pageUrl, referrer) {
   return actual;
 
   function getPreviousTrafficSource() {
-    let val = localStorage.getItem(ADKERNEL_PREBID_KEY);
+    let val = storage.getItem(ADKERNEL_PREBID_KEY);
     if (!val) {
       return getDirect();
     }
@@ -235,10 +244,10 @@ export function getUmtSource(pageUrl, referrer) {
       return;
     }
     let utmArgs = [];
-    for (let utmTagName of UTM_TAGS) {
+    utils._each(UTM_TAGS, (utmTagName) => {
       let utmValue = urlParameters[utmTagName] || '';
       utmArgs.push(utmValue);
-    }
+    });
     return asUtm.apply(this, utmArgs);
   }
 
@@ -248,7 +257,7 @@ export function getUmtSource(pageUrl, referrer) {
 
   function storeUtm(utm) {
     let val = JSON.stringify(utm);
-    localStorage.setItem(ADKERNEL_PREBID_KEY, val);
+    storage.setItem(ADKERNEL_PREBID_KEY, val);
   }
 
   function asUtm(source, medium, campaign, term = '', content = '', c1 = '', c2 = '', c3 = '', c4 = '', c5 = '') {
diff --git a/test/spec/modules/adkernelAdnAnalyticsAdapter_spec.js b/test/spec/modules/adkernelAdnAnalyticsAdapter_spec.js
index e71689868f7..1a14660c6af 100644
--- a/test/spec/modules/adkernelAdnAnalyticsAdapter_spec.js
+++ b/test/spec/modules/adkernelAdnAnalyticsAdapter_spec.js
@@ -1,4 +1,4 @@
-import analyticsAdapter, {ExpiringQueue, getUmtSource} from 'modules/adkernelAdnAnalyticsAdapter';
+import analyticsAdapter, {ExpiringQueue, getUmtSource, storage} from 'modules/adkernelAdnAnalyticsAdapter';
 import {expect} from 'chai';
 import adaptermanager from 'src/adaptermanager';
 import * as events from 'src/events';
@@ -48,8 +48,8 @@ describe('', () => {
     let stubGetItem;
 
     before(() => {
-      stubSetItem = sandbox.stub(localStorage, 'setItem');
-      stubGetItem = sandbox.stub(localStorage, 'getItem');
+      stubSetItem = sandbox.stub(storage, 'setItem');
+      stubGetItem = sandbox.stub(storage, 'getItem');
     });
 
     afterEach(() => {
@@ -114,27 +114,34 @@ describe('', () => {
   });
 
   describe('ExpiringQueue', () => {
-    let start;
+    let timer;
     before(() => {
-      start = Date.now();
+      timer = sandbox.useFakeTimers(0);
     });
+    after(() => {
+      timer.restore();
+    });
+
     it('should notify after timeout period', (done) => {
       let queue = new ExpiringQueue(() => {
         let elements = queue.popAll();
         expect(elements).to.be.eql([1, 2, 3, 4]);
         elements = queue.popAll();
         expect(elements).to.have.lengthOf(0);
-        expect(Date.now() - start).to.be.at.least(200).and.below(250);
+        expect(Date.now()).to.be.equal(200);
         done();
       }, 100);
 
       queue.push(1);
       setTimeout(() => {
         queue.push([2, 3]);
+        timer.tick(50);
       }, 50);
       setTimeout(() => {
         queue.push([4]);
+        timer.tick(100);
       }, 100);
+      timer.tick(50);
     });
   });