diff --git a/test/mocks/xhr.js b/test/mocks/xhr.js
new file mode 100644
index 00000000000..9fb8fe87fa0
--- /dev/null
+++ b/test/mocks/xhr.js
@@ -0,0 +1,9 @@
+
+export let server = sinon.createFakeServer();
+export let xhr = global.XMLHttpRequest;
+
+beforeEach(function() {
+  server.restore();
+  server = sinon.createFakeServer();
+  xhr = global.XMLHttpRequest;
+});
diff --git a/test/spec/AnalyticsAdapter_spec.js b/test/spec/AnalyticsAdapter_spec.js
index 2e992d3298c..2ede81538c1 100644
--- a/test/spec/AnalyticsAdapter_spec.js
+++ b/test/spec/AnalyticsAdapter_spec.js
@@ -1,6 +1,7 @@
 import { expect } from 'chai';
 import events from 'src/events';
 import CONSTANTS from 'src/constants.json';
+import { server } from 'test/mocks/xhr';
 
 const REQUEST_BIDS = CONSTANTS.EVENTS.REQUEST_BIDS;
 const BID_REQUESTED = CONSTANTS.EVENTS.BID_REQUESTED;
@@ -20,19 +21,13 @@ describe(`
 FEATURE: Analytics Adapters API
   SCENARIO: A publisher enables analytics
     AND an  \`example\` instance of \`AnalyticsAdapter\`\n`, () => {
-  let xhr;
-  let requests;
   let adapter;
 
   beforeEach(function () {
-    xhr = sinon.useFakeXMLHttpRequest();
-    requests = [];
-    xhr.onCreate = (request) => requests.push(request);
     adapter = new AnalyticsAdapter(config);
   });
 
   afterEach(function () {
-    xhr.restore();
     adapter.disableAnalytics();
   });
 
@@ -42,7 +37,7 @@ FEATURE: Analytics Adapters API
 
     adapter.track({ eventType, args });
 
-    let result = JSON.parse(requests[0].requestBody);
+    let result = JSON.parse(server.requests[0].requestBody);
     expect(result).to.deep.equal({args: {some: 'data'}, eventType: 'bidRequested'});
   });
 
@@ -53,7 +48,7 @@ FEATURE: Analytics Adapters API
     events.emit(eventType, args);
     adapter.enableAnalytics();
 
-    let result = JSON.parse(requests[0].requestBody);
+    let result = JSON.parse(server.requests[0].requestBody);
     expect(result).to.deep.equal({args: {wat: 'wot'}, eventType: 'bidResponse'});
   });
 
@@ -73,7 +68,7 @@ FEATURE: Analytics Adapters API
       adapter.enableAnalytics();
       events.emit(eventType, args);
 
-      let result = JSON.parse(requests[0].requestBody);
+      let result = JSON.parse(server.requests[0].requestBody);
       expect(result).to.deep.equal({args: {more: 'info'}, eventType: 'bidWon'});
     });
 
@@ -84,7 +79,7 @@ FEATURE: Analytics Adapters API
       adapter.enableAnalytics();
       events.emit(eventType, args);
 
-      let result = JSON.parse(requests[0].requestBody);
+      let result = JSON.parse(server.requests[0].requestBody);
       expect(result).to.deep.equal({args: {call: 'adRenderFailed'}, eventType: 'adRenderFailed'});
     });
 
@@ -95,7 +90,7 @@ FEATURE: Analytics Adapters API
       adapter.enableAnalytics();
       events.emit(eventType, args);
 
-      let result = JSON.parse(requests[0].requestBody);
+      let result = JSON.parse(server.requests[0].requestBody);
       expect(result).to.deep.equal({args: {call: 'addAdUnits'}, eventType: 'addAdUnits'});
     });
 
@@ -106,7 +101,7 @@ FEATURE: Analytics Adapters API
       adapter.enableAnalytics();
       events.emit(eventType, args);
 
-      let result = JSON.parse(requests[0].requestBody);
+      let result = JSON.parse(server.requests[0].requestBody);
       expect(result).to.deep.equal({args: {call: 'request'}, eventType: 'requestBids'});
     });
 
@@ -117,7 +112,7 @@ FEATURE: Analytics Adapters API
       adapter.enableAnalytics();
       events.emit(eventType, args);
 
-      let result = JSON.parse(requests[0].requestBody);
+      let result = JSON.parse(server.requests[0].requestBody);
       expect(result).to.deep.equal({args: {call: 'request'}, eventType: 'bidRequested'});
     });
 
@@ -128,7 +123,7 @@ FEATURE: Analytics Adapters API
       adapter.enableAnalytics();
       events.emit(eventType, args);
 
-      let result = JSON.parse(requests[0].requestBody);
+      let result = JSON.parse(server.requests[0].requestBody);
       expect(result).to.deep.equal({args: {call: 'response'}, eventType: 'bidResponse'});
     });
 
@@ -139,7 +134,7 @@ FEATURE: Analytics Adapters API
       adapter.enableAnalytics();
       events.emit(eventType, args);
 
-      let result = JSON.parse(requests[0].requestBody);
+      let result = JSON.parse(server.requests[0].requestBody);
       expect(result).to.deep.equal({args: {call: 'timeout'}, eventType: 'bidTimeout'});
     });
 
@@ -151,7 +146,7 @@ FEATURE: Analytics Adapters API
       adapter.enableAnalytics();
       events.emit(eventType, args);
 
-      expect(requests.length).to.equal(1);
+      expect(server.requests.length).to.equal(1);
     });
 
     describe(`AND sampling is enabled\n`, function () {
@@ -174,8 +169,8 @@ FEATURE: Analytics Adapters API
         });
         events.emit(eventType, args);
 
-        expect(requests.length).to.equal(1);
-        let result = JSON.parse(requests[0].requestBody);
+        expect(server.requests.length).to.equal(1);
+        let result = JSON.parse(server.requests[0].requestBody);
         expect(result).to.deep.equal({args: {more: 'info'}, eventType: 'bidWon'});
       });
 
@@ -187,7 +182,7 @@ FEATURE: Analytics Adapters API
         });
         events.emit(eventType, args);
 
-        expect(requests.length).to.equal(0);
+        expect(server.requests.length).to.equal(0);
       });
     });
   });
diff --git a/test/spec/auctionmanager_spec.js b/test/spec/auctionmanager_spec.js
index 970bc61cc61..2693daa62b3 100644
--- a/test/spec/auctionmanager_spec.js
+++ b/test/spec/auctionmanager_spec.js
@@ -8,6 +8,7 @@ import { config } from 'src/config';
 import * as store from 'src/videoCache';
 import * as ajaxLib from 'src/ajax';
 import find from 'core-js/library/fn/array/find';
+import { server } from 'test/mocks/xhr';
 
 var assert = require('assert');
 
@@ -766,7 +767,6 @@ describe('auctionmanager.js', function () {
 
     describe('when auction timeout is 20', function () {
       let eventsEmitSpy;
-      let server;
 
       before(function () {
         bids = [mockBid(), mockBid({ bidderCode: BIDDER_CODE1 })];
@@ -776,8 +776,6 @@ describe('auctionmanager.js', function () {
       });
 
       beforeEach(function () {
-        server = sinon.createFakeServer();
-
         adUnits = [{
           code: ADUNIT_CODE,
           bids: [
@@ -789,7 +787,6 @@ describe('auctionmanager.js', function () {
         eventsEmitSpy = sinon.spy(events, 'emit');
       });
       afterEach(function () {
-        server.restore();
         events.emit.restore();
       });
 
@@ -1058,8 +1055,6 @@ describe('auctionmanager.js', function () {
   describe('auctionCallbacks', function() {
     let bids = TEST_BIDS;
     let bidRequests;
-    let xhr;
-    let requests;
     let doneSpy;
     let auction = {
       getBidRequests: () => bidRequests,
@@ -1070,9 +1065,6 @@ describe('auctionmanager.js', function () {
 
     beforeEach(() => {
       doneSpy = sinon.spy();
-      xhr = sinon.useFakeXMLHttpRequest();
-      requests = [];
-      xhr.onCreate = (request) => requests.push(request);
       config.setConfig({
         cache: {
           url: 'https://prebid.adnxs.com/pbc/v1/cache'
@@ -1082,7 +1074,6 @@ describe('auctionmanager.js', function () {
 
     afterEach(() => {
       doneSpy.resetHistory();
-      xhr.restore();
       config.resetConfig();
     });
 
@@ -1132,7 +1123,7 @@ describe('auctionmanager.js', function () {
       assert.equal(doneSpy.callCount, 0);
       const uuid = 'c488b101-af3e-4a99-b538-00423e5a3371';
       const responseBody = `{"responses":[{"uuid":"${uuid}"}]}`;
-      requests[0].respond(200, { 'Content-Type': 'application/json' }, responseBody);
+      server.requests[0].respond(200, { 'Content-Type': 'application/json' }, responseBody);
       assert.equal(doneSpy.callCount, 1);
     })
   });
diff --git a/test/spec/modules/adxcgAnalyticsAdapter_spec.js b/test/spec/modules/adxcgAnalyticsAdapter_spec.js
index 605da3bd6bc..2c495370a57 100644
--- a/test/spec/modules/adxcgAnalyticsAdapter_spec.js
+++ b/test/spec/modules/adxcgAnalyticsAdapter_spec.js
@@ -1,23 +1,17 @@
 import adxcgAnalyticsAdapter from 'modules/adxcgAnalyticsAdapter';
 import { expect } from 'chai';
 import adapterManager from 'src/adapterManager.js';
+import { server } from 'test/mocks/xhr';
 
 let events = require('src/events');
 let constants = require('src/constants.json');
 
 describe('adxcg analytics adapter', function () {
-  let xhr;
-  let requests;
-
   beforeEach(function () {
-    xhr = sinon.useFakeXMLHttpRequest();
-    requests = [];
-    xhr.onCreate = request => requests.push(request);
     sinon.stub(events, 'getEvents').returns([]);
   });
 
   afterEach(function () {
-    xhr.restore();
     events.getEvents.restore();
   });
 
@@ -193,9 +187,9 @@ describe('adxcg analytics adapter', function () {
       // Step 5: Send auction end event
       events.emit(constants.EVENTS.AUCTION_END, {});
 
-      expect(requests.length).to.equal(1);
+      expect(server.requests.length).to.equal(1);
 
-      let realAfterBid = JSON.parse(requests[0].requestBody);
+      let realAfterBid = JSON.parse(server.requests[0].requestBody);
 
       expect(realAfterBid).to.deep.equal(expectedAfterBid);
 
@@ -204,8 +198,8 @@ describe('adxcg analytics adapter', function () {
       // Step 6: Send auction bid won event
       events.emit(constants.EVENTS.BID_WON, wonRequest);
 
-      expect(requests.length).to.equal(2);
-      let winEventData = JSON.parse(requests[1].requestBody);
+      expect(server.requests.length).to.equal(2);
+      let winEventData = JSON.parse(server.requests[1].requestBody);
 
       expect(winEventData).to.deep.equal(wonExpect);
     });
diff --git a/test/spec/modules/appierAnalyticsAdapter_spec.js b/test/spec/modules/appierAnalyticsAdapter_spec.js
index 07b9796a4cb..cf47f31afe4 100644
--- a/test/spec/modules/appierAnalyticsAdapter_spec.js
+++ b/test/spec/modules/appierAnalyticsAdapter_spec.js
@@ -15,8 +15,6 @@ const auctionId = 'b0b39610-b941-4659-a87c-de9f62d3e13e';
 
 describe('Appier Prebid AnalyticsAdapter Testing', function () {
   describe('event tracking and message cache manager', function () {
-    let xhr;
-
     beforeEach(function () {
       const configOptions = {
         affiliateId: affiliateId,
@@ -32,12 +30,10 @@ describe('Appier Prebid AnalyticsAdapter Testing', function () {
         provider: 'appierAnalytics',
         options: configOptions
       });
-      xhr = sinon.useFakeXMLHttpRequest();
     });
 
     afterEach(function () {
       appierAnalyticsAdapter.disableAnalytics();
-      xhr.restore();
     });
 
     describe('#getCpmInUsd()', function() {
diff --git a/test/spec/modules/criteortusIdSystem_spec.js b/test/spec/modules/criteortusIdSystem_spec.js
index 217a2f86ba7..6ceaa7aa953 100644
--- a/test/spec/modules/criteortusIdSystem_spec.js
+++ b/test/spec/modules/criteortusIdSystem_spec.js
@@ -1,5 +1,6 @@
 import { criteortusIdSubmodule } from 'modules/criteortusIdSystem';
 import * as utils from 'src/utils';
+import { server } from 'test/mocks/xhr';
 
 describe('Criteo RTUS', function() {
   let xhr;
@@ -8,15 +9,11 @@ describe('Criteo RTUS', function() {
   let logErrorStub;
 
   beforeEach(function () {
-    xhr = sinon.useFakeXMLHttpRequest();
-    requests = [];
-    xhr.onCreate = request => requests.push(request);
     getCookieStub = sinon.stub(utils, 'getCookie');
     logErrorStub = sinon.stub(utils, 'logError');
   });
 
   afterEach(function () {
-    xhr.restore();
     getCookieStub.restore();
     logErrorStub.restore();
   });
@@ -39,7 +36,7 @@ describe('Criteo RTUS', function() {
     const idResp = criteortusIdSubmodule.getId(configParams);
     const submoduleCallback = idResp.callback;
     submoduleCallback(callBackSpy);
-    requests[0].respond(
+    server.requests[0].respond(
       200,
       { 'Content-Type': 'text/plain' },
       JSON.stringify(response)
@@ -57,7 +54,7 @@ describe('Criteo RTUS', function() {
       }
     }
     let uid = criteortusIdSubmodule.getId(configParams);
-    expect(requests.length).to.equal(0);
+    expect(server.requests.length).to.equal(0);
   })
 
   it('should call criteo endpoint for multiple bidders', function() {
@@ -74,13 +71,13 @@ describe('Criteo RTUS', function() {
     const idResp = criteortusIdSubmodule.getId(configParams);
     const submoduleCallback = idResp.callback;
     submoduleCallback(callBackSpy);
-    requests[0].respond(
+    server.requests[0].respond(
       200,
       { 'Content-Type': 'text/plain' },
       JSON.stringify(response)
     );
     expect(callBackSpy.calledOnce).to.be.false;
-    requests[1].respond(
+    server.requests[1].respond(
       200,
       { 'Content-Type': 'text/plain' },
       JSON.stringify(response)
diff --git a/test/spec/modules/dfpAdServerVideo_spec.js b/test/spec/modules/dfpAdServerVideo_spec.js
index 6271c9b38f4..ff527c379e2 100644
--- a/test/spec/modules/dfpAdServerVideo_spec.js
+++ b/test/spec/modules/dfpAdServerVideo_spec.js
@@ -9,6 +9,7 @@ import { config } from 'src/config';
 import { targeting } from 'src/targeting';
 import { auctionManager } from 'src/auctionManager';
 import * as adpod from 'modules/adpod';
+import { server } from 'test/mocks/xhr';
 
 const bid = {
   videoCacheKey: 'abc',
@@ -302,8 +303,6 @@ describe('The DFP video support module', function () {
   describe('adpod unit tests', function () {
     let amStub;
     let amGetAdUnitsStub;
-    let xhr;
-    let requests;
 
     before(function () {
       let adUnits = [{
@@ -333,10 +332,6 @@ describe('The DFP video support module', function () {
     });
 
     beforeEach(function () {
-      xhr = sinon.useFakeXMLHttpRequest();
-      requests = [];
-      xhr.onCreate = request => requests.push(request);
-
       config.setConfig({
         adpod: {
           brandCategoryExclusion: true,
@@ -347,7 +342,6 @@ describe('The DFP video support module', function () {
 
     afterEach(function() {
       config.resetConfig();
-      xhr.restore();
     });
 
     after(function () {
@@ -466,7 +460,7 @@ describe('The DFP video support module', function () {
         }
       }));
 
-      requests[0].respond(503, {
+      server.requests[0].respond(503, {
         'Content-Type': 'plain/text',
       }, 'The server could not save anything at the moment.');
 
diff --git a/test/spec/modules/eplanningAnalyticsAdapter_spec.js b/test/spec/modules/eplanningAnalyticsAdapter_spec.js
index 8609024c7d9..3e72cfc1dcc 100644
--- a/test/spec/modules/eplanningAnalyticsAdapter_spec.js
+++ b/test/spec/modules/eplanningAnalyticsAdapter_spec.js
@@ -2,23 +2,17 @@ import eplAnalyticsAdapter from 'modules/eplanningAnalyticsAdapter';
 import includes from 'core-js/library/fn/array/includes';
 import { expect } from 'chai';
 import {parse as parseURL} from 'src/url';
+import { server } from 'test/mocks/xhr';
 let adapterManager = require('src/adapterManager').default;
 let events = require('src/events');
 let constants = require('src/constants.json');
 
 describe('eplanning analytics adapter', function () {
-  let xhr;
-  let requests;
-
   beforeEach(function () {
-    xhr = sinon.useFakeXMLHttpRequest();
-    requests = [];
-    xhr.onCreate = request => { requests.push(request) };
     sinon.stub(events, 'getEvents').returns([]);
   });
 
   afterEach(function () {
-    xhr.restore();
     events.getEvents.restore();
     eplAnalyticsAdapter.disableAnalytics();
   });
@@ -115,7 +109,7 @@ describe('eplanning analytics adapter', function () {
       events.emit(constants.EVENTS.AUCTION_END, {auctionId: pauctionId});
 
       // Step 7: Find the request data sent (filtering other hosts)
-      requests = requests.filter(req => {
+      let requests = server.requests.filter(req => {
         return req.url.indexOf(initOptions.host) > -1;
       });
       expect(requests.length).to.equal(1);
diff --git a/test/spec/modules/feedadBidAdapter_spec.js b/test/spec/modules/feedadBidAdapter_spec.js
index 3432a40eca4..d7d0f32e252 100644
--- a/test/spec/modules/feedadBidAdapter_spec.js
+++ b/test/spec/modules/feedadBidAdapter_spec.js
@@ -1,7 +1,7 @@
 import {expect} from 'chai';
 import {spec} from 'modules/feedadBidAdapter';
 import {BANNER, NATIVE, VIDEO} from '../../../src/mediaTypes';
-import * as sinon from 'sinon';
+import {server} from 'test/mocks/xhr';
 
 const CODE = 'feedad';
 
@@ -382,28 +382,15 @@ describe('FeedAdAdapter', function () {
     cases.forEach(([name, data, eventKlass]) => {
       let subject = spec[name];
       describe(name + ' handler', function () {
-        let xhr;
-        let requests;
-
-        beforeEach(function () {
-          xhr = sinon.useFakeXMLHttpRequest();
-          requests = [];
-          xhr.onCreate = xhr => requests.push(xhr);
-        });
-
-        afterEach(function () {
-          xhr.restore();
-        });
-
         it('should do nothing on empty data', function () {
           subject(undefined);
           subject(null);
-          expect(requests.length).to.equal(0);
+          expect(server.requests.length).to.equal(0);
         });
 
         it('should do nothing when bid metadata is not set', function () {
           subject(data);
-          expect(requests.length).to.equal(0);
+          expect(server.requests.length).to.equal(0);
         });
 
         it('should send tracking params when correct metadata was set', function () {
@@ -420,8 +407,8 @@ describe('FeedAdAdapter', function () {
             sdk_version: '1.0.0'
           };
           subject(data);
-          expect(requests.length).to.equal(1);
-          let call = requests[0];
+          expect(server.requests.length).to.equal(1);
+          let call = server.requests[0];
           expect(call.url).to.equal('https://api.feedad.com/1/prebid/web/events');
           expect(JSON.parse(call.requestBody)).to.deep.equal(expectedData);
           expect(call.method).to.equal('POST');
diff --git a/test/spec/modules/fintezaAnalyticsAdapter_spec.js b/test/spec/modules/fintezaAnalyticsAdapter_spec.js
index 2cc2f380016..da575035d09 100644
--- a/test/spec/modules/fintezaAnalyticsAdapter_spec.js
+++ b/test/spec/modules/fintezaAnalyticsAdapter_spec.js
@@ -2,6 +2,7 @@ import fntzAnalyticsAdapter from 'modules/fintezaAnalyticsAdapter';
 import includes from 'core-js/library/fn/array/includes';
 import { expect } from 'chai';
 import { parse as parseURL } from 'src/url';
+import { server } from 'test/mocks/xhr';
 
 let adapterManager = require('src/adapterManager').default;
 let events = require('src/events');
@@ -18,14 +19,8 @@ describe('finteza analytics adapter', function () {
   const clientId = 'fntz-client-32145';
   const uniqCookie = '5045380421580287382';
 
-  let xhr;
-  let requests;
-
   beforeEach(function () {
     setCookie('_fz_uniq', uniqCookie);
-    xhr = sinon.useFakeXMLHttpRequest();
-    requests = [];
-    xhr.onCreate = request => { requests.push(request) };
     sinon.stub(events, 'getEvents').returns([]);
     sinon.spy(fntzAnalyticsAdapter, 'track');
 
@@ -49,7 +44,6 @@ describe('finteza analytics adapter', function () {
 
   afterEach(function () {
     setCookie('_fz_uniq', '', new Date(0));
-    xhr.restore();
     events.getEvents.restore();
     fntzAnalyticsAdapter.track.restore();
     fntzAnalyticsAdapter.disableAnalytics();
@@ -82,12 +76,12 @@ describe('finteza analytics adapter', function () {
         // Emit the events with the "real" arguments
         events.emit(constants.EVENTS.BID_REQUESTED, bidRequest);
 
-        expect(requests.length).to.equal(1);
+        expect(server.requests.length).to.equal(1);
 
-        expect(requests[0].method).to.equal('GET');
-        expect(requests[0].withCredentials).to.equal(true);
+        expect(server.requests[0].method).to.equal('GET');
+        expect(server.requests[0].withCredentials).to.equal(true);
 
-        const url = parseURL(requests[0].url);
+        const url = parseURL(server.requests[0].url);
 
         expect(url.protocol).to.equal('https');
         expect(url.hostname).to.equal('content.mql5.com');
@@ -125,12 +119,12 @@ describe('finteza analytics adapter', function () {
         // Emit the events with the "real" arguments
         events.emit(constants.EVENTS.BID_RESPONSE, bidResponse);
 
-        expect(requests.length).to.equal(2);
+        expect(server.requests.length).to.equal(2);
 
-        expect(requests[0].method).to.equal('GET');
-        expect(requests[0].withCredentials).to.equal(true);
+        expect(server.requests[0].method).to.equal('GET');
+        expect(server.requests[0].withCredentials).to.equal(true);
 
-        let url = parseURL(requests[0].url);
+        let url = parseURL(server.requests[0].url);
 
         expect(url.protocol).to.equal('https');
         expect(url.hostname).to.equal('content.mql5.com');
@@ -141,10 +135,10 @@ describe('finteza analytics adapter', function () {
         expect(url.search.value).to.equal(String(cpm));
         expect(url.search.unit).to.equal('usd');
 
-        expect(requests[1].method).to.equal('GET');
-        expect(requests[1].withCredentials).to.equal(true);
+        expect(server.requests[1].method).to.equal('GET');
+        expect(server.requests[1].withCredentials).to.equal(true);
 
-        url = parseURL(requests[1].url);
+        url = parseURL(server.requests[1].url);
 
         expect(url.protocol).to.equal('https');
         expect(url.hostname).to.equal('content.mql5.com');
@@ -179,12 +173,12 @@ describe('finteza analytics adapter', function () {
         // Emit the events with the "real" arguments
         events.emit(constants.EVENTS.BID_WON, bidWon);
 
-        expect(requests.length).to.equal(1);
+        expect(server.requests.length).to.equal(1);
 
-        expect(requests[0].method).to.equal('GET');
-        expect(requests[0].withCredentials).to.equal(true);
+        expect(server.requests[0].method).to.equal('GET');
+        expect(server.requests[0].withCredentials).to.equal(true);
 
-        const url = parseURL(requests[0].url);
+        const url = parseURL(server.requests[0].url);
 
         expect(url.protocol).to.equal('https');
         expect(url.hostname).to.equal('content.mql5.com');
@@ -218,12 +212,12 @@ describe('finteza analytics adapter', function () {
         // Emit the events with the "real" arguments
         events.emit(constants.EVENTS.BID_TIMEOUT, bidTimeout);
 
-        expect(requests.length).to.equal(1);
+        expect(server.requests.length).to.equal(1);
 
-        expect(requests[0].method).to.equal('GET');
-        expect(requests[0].withCredentials).to.equal(true);
+        expect(server.requests[0].method).to.equal('GET');
+        expect(server.requests[0].withCredentials).to.equal(true);
 
-        const url = parseURL(requests[0].url);
+        const url = parseURL(server.requests[0].url);
 
         expect(url.protocol).to.equal('https');
         expect(url.hostname).to.equal('content.mql5.com');
diff --git a/test/spec/modules/freeWheelAdserverVideo_spec.js b/test/spec/modules/freeWheelAdserverVideo_spec.js
index c2afaf8d69f..4e37a345716 100644
--- a/test/spec/modules/freeWheelAdserverVideo_spec.js
+++ b/test/spec/modules/freeWheelAdserverVideo_spec.js
@@ -2,12 +2,11 @@ import { expect } from 'chai';
 import { adpodUtils } from 'modules/freeWheelAdserverVideo';
 import { auctionManager } from 'src/auctionManager';
 import { config } from 'src/config';
+import { server } from 'test/mocks/xhr';
 
 describe('freeWheel adserver module', function() {
   let amStub;
   let amGetAdUnitsStub;
-  let xhr;
-  let requests;
 
   before(function () {
     let adUnits = [{
@@ -56,10 +55,6 @@ describe('freeWheel adserver module', function() {
   });
 
   beforeEach(function () {
-    xhr = sinon.useFakeXMLHttpRequest();
-    requests = [];
-    xhr.onCreate = request => requests.push(request);
-
     config.setConfig({
       adpod: {
         brandCategoryExclusion: false,
@@ -70,7 +65,6 @@ describe('freeWheel adserver module', function() {
 
   afterEach(function() {
     config.resetConfig();
-    xhr.restore();
   });
 
   after(function () {
@@ -188,7 +182,7 @@ describe('freeWheel adserver module', function() {
       }
     });
 
-    requests[0].respond(
+    server.requests[0].respond(
       200,
       { 'Content-Type': 'text/plain' },
       JSON.stringify({'responses': getBidsReceived().slice(0, 4)})
diff --git a/test/spec/modules/livewrappedAnalyticsAdapter_spec.js b/test/spec/modules/livewrappedAnalyticsAdapter_spec.js
index 649b85b9c07..98ed21132e3 100644
--- a/test/spec/modules/livewrappedAnalyticsAdapter_spec.js
+++ b/test/spec/modules/livewrappedAnalyticsAdapter_spec.js
@@ -1,6 +1,7 @@
 import livewrappedAnalyticsAdapter, { BID_WON_TIMEOUT } from 'modules/livewrappedAnalyticsAdapter';
 import CONSTANTS from 'src/constants.json';
 import { config } from 'src/config';
+import { server } from 'test/mocks/xhr';
 
 let events = require('src/events');
 let utils = require('src/utils');
@@ -208,17 +209,11 @@ function performStandardAuction() {
 
 describe('Livewrapped analytics adapter', function () {
   let sandbox;
-  let xhr;
-  let requests;
   let clock;
 
   beforeEach(function () {
     sandbox = sinon.sandbox.create();
 
-    xhr = sandbox.useFakeXMLHttpRequest();
-    requests = [];
-    xhr.onCreate = request => requests.push(request);
-
     sandbox.stub(events, 'getEvents').returns([]);
     sandbox.stub(utils, 'timestamp').returns(1519149562416);
 
@@ -255,8 +250,8 @@ describe('Livewrapped analytics adapter', function () {
 
       clock.tick(BID_WON_TIMEOUT + 1000);
 
-      expect(requests.length).to.equal(1);
-      let request = requests[0];
+      expect(server.requests.length).to.equal(1);
+      let request = server.requests[0];
 
       expect(request.url).to.equal('https://lwadm.com/analytics/10');
 
@@ -279,14 +274,14 @@ describe('Livewrapped analytics adapter', function () {
 
       events.emit(BID_WON, MOCK.BID_WON[1]);
 
-      expect(requests.length).to.equal(2);
+      expect(server.requests.length).to.equal(2);
 
-      let message = JSON.parse(requests[0].requestBody);
+      let message = JSON.parse(server.requests[0].requestBody);
       expect(message.wins.length).to.equal(1);
       expect(message.requests).to.deep.equal(ANALYTICS_MESSAGE.requests);
       expect(message.wins[0]).to.deep.equal(ANALYTICS_MESSAGE.wins[0]);
 
-      message = JSON.parse(requests[1].requestBody);
+      message = JSON.parse(server.requests[1].requestBody);
       expect(message.wins.length).to.equal(1);
       expect(message.wins[0]).to.deep.equal(ANALYTICS_MESSAGE.wins[1]);
     });
@@ -299,9 +294,9 @@ describe('Livewrapped analytics adapter', function () {
 
       clock.tick(BID_WON_TIMEOUT + 1000);
 
-      expect(requests.length).to.equal(1);
+      expect(server.requests.length).to.equal(1);
 
-      let message = JSON.parse(requests[0].requestBody);
+      let message = JSON.parse(server.requests[0].requestBody);
       expect(message.timeouts.length).to.equal(1);
       expect(message.timeouts[0].bidder).to.equal('livewrapped');
       expect(message.timeouts[0].adUnit).to.equal('panorama_d_1');
@@ -313,8 +308,8 @@ describe('Livewrapped analytics adapter', function () {
 
       clock.tick(BID_WON_TIMEOUT + 1000);
 
-      expect(requests.length).to.equal(1);
-      let request = requests[0];
+      expect(server.requests.length).to.equal(1);
+      let request = server.requests[0];
 
       let message = JSON.parse(request.requestBody);
 
diff --git a/test/spec/modules/openxAnalyticsAdapter_spec.js b/test/spec/modules/openxAnalyticsAdapter_spec.js
index 168f06aa915..1020b89d3b7 100644
--- a/test/spec/modules/openxAnalyticsAdapter_spec.js
+++ b/test/spec/modules/openxAnalyticsAdapter_spec.js
@@ -4,6 +4,7 @@ import { config } from 'src/config';
 import events from 'src/events';
 import CONSTANTS from 'src/constants.json';
 import * as utils from 'src/utils';
+import { server } from 'test/mocks/xhr';
 
 const {
   EVENTS: { AUCTION_INIT, BID_REQUESTED, BID_RESPONSE, BID_TIMEOUT, BID_WON }
@@ -152,12 +153,7 @@ describe('openx analytics adapter', function() {
       }, {});
     }
 
-    let xhr;
-    let requests;
-
     before(function() {
-      xhr = sinon.useFakeXMLHttpRequest();
-      xhr.onCreate = request => requests.push(request);
       sinon.stub(events, 'getEvents').returns([]);
       openxAdapter.enableAnalytics({
         options: {
@@ -167,13 +163,11 @@ describe('openx analytics adapter', function() {
     });
 
     after(function() {
-      xhr.restore();
       events.getEvents.restore();
       openxAdapter.disableAnalytics();
     });
 
     beforeEach(function() {
-      requests = [];
       openxAdapter.reset();
     });
 
@@ -185,7 +179,7 @@ describe('openx analytics adapter', function() {
         [BID_REQUESTED, bidRequestedOpenX]
       ]);
 
-      expect(requests.length).to.equal(0);
+      expect(server.requests.length).to.equal(0);
     });
 
     it('should send 1 request to the right endpoint', function() {
@@ -195,9 +189,9 @@ describe('openx analytics adapter', function() {
         [BID_RESPONSE, bidResponseOpenX]
       ]);
 
-      expect(requests.length).to.equal(1);
+      expect(server.requests.length).to.equal(1);
 
-      const endpoint = requests[0].url.split('?')[0];
+      const endpoint = server.requests[0].url.split('?')[0];
       // note IE11 returns the default secure port, so we look for this alternate value as well in these tests
       expect(endpoint).to.be.oneOf(['https://ads.openx.net/w/1.0/pban', 'https://ads.openx.net:443/w/1.0/pban']);
     });
@@ -210,7 +204,7 @@ describe('openx analytics adapter', function() {
           [BID_RESPONSE, bidResponseOpenX]
         ]);
 
-        const queryData = getQueryData(requests[0].url);
+        const queryData = getQueryData(server.requests[0].url);
         expect(queryData).to.include({
           'hb.ct': String(bidRequestedOpenX.auctionStart),
           'hb.rid': auctionInit.auctionId,
@@ -236,7 +230,7 @@ describe('openx analytics adapter', function() {
 
         config.getConfig.restore();
 
-        const queryData = getQueryData(requests[0].url);
+        const queryData = getQueryData(server.requests[0].url);
         expect(queryData).to.include({
           'hb.cur': 'bitcoin'
         });
@@ -249,7 +243,7 @@ describe('openx analytics adapter', function() {
           [BID_RESPONSE, bidResponseOpenX]
         ]);
 
-        const queryData = getQueryData(requests[0].url);
+        const queryData = getQueryData(server.requests[0].url);
         expect(queryData).to.not.have.key('hb.cur');
       });
     });
@@ -276,7 +270,7 @@ describe('openx analytics adapter', function() {
         window.top.performance = originalPerf;
         Date.now.restore();
 
-        const queryData = getQueryData(requests[0].url);
+        const queryData = getQueryData(server.requests[0].url);
         expect(queryData).to.include({
           'hb.dcl': String(timing.domContentLoadedEventEnd - timing.fetchStart),
           'hb.dl': String(timing.loadEventEnd - timing.fetchStart),
@@ -297,7 +291,7 @@ describe('openx analytics adapter', function() {
 
         window.top.performance = originalPerf;
 
-        const queryData = getQueryData(requests[0].url);
+        const queryData = getQueryData(server.requests[0].url);
         expect(queryData).to.not.have.keys(
           'hb.dcl',
           'hb.dl',
@@ -317,7 +311,7 @@ describe('openx analytics adapter', function() {
           [BID_RESPONSE, bidResponseCloseX]
         ]);
 
-        const queryData = getQueryData(requests[0].url);
+        const queryData = getQueryData(server.requests[0].url);
         expect(queryData).to.include({
           ts: bidResponseOpenX.ts,
           auid: bidRequestedOpenX.bids[0].params.unit
@@ -332,7 +326,7 @@ describe('openx analytics adapter', function() {
           [BID_RESPONSE, bidResponseCloseX]
         ]);
 
-        const queryData = getQueryData(requests[0].url);
+        const queryData = getQueryData(server.requests[0].url);
         expect(queryData).to.include({
           auid: bidRequestedOpenX.bids[0].params.unit
         });
@@ -346,7 +340,7 @@ describe('openx analytics adapter', function() {
           [BID_RESPONSE, bidResponseCloseX]
         ]);
 
-        const queryData = getQueryData(requests[0].url);
+        const queryData = getQueryData(server.requests[0].url);
         expect(queryData).to.not.have.keys('auid', 'ts');
       });
     });
@@ -361,7 +355,7 @@ describe('openx analytics adapter', function() {
           [BID_RESPONSE, bidResponseCloseX]
         ]);
 
-        const queryData = getQueryData(requests[0].url);
+        const queryData = getQueryData(server.requests[0].url);
         const auctionStart = bidRequestedOpenX.auctionStart;
         expect(queryData).to.include({
           'hb.exn': [
@@ -394,7 +388,7 @@ describe('openx analytics adapter', function() {
           [BID_TIMEOUT, bidTimeoutOpenX]
         ]);
 
-        const queryData = getQueryData(requests[0].url);
+        const queryData = getQueryData(server.requests[0].url);
         const auctionStart = bidRequestedOpenX.auctionStart;
         expect(queryData).to.include({
           'hb.exn': [
@@ -425,7 +419,7 @@ describe('openx analytics adapter', function() {
           [BID_WON, bidWonOpenX]
         ]);
 
-        const queryData = getQueryData(requests[0].url);
+        const queryData = getQueryData(server.requests[0].url);
         expect(queryData).to.include({
           'hb.we': '0',
           'hb.g1': 'false'
@@ -439,7 +433,7 @@ describe('openx analytics adapter', function() {
           [BID_RESPONSE, bidResponseOpenX]
         ]);
 
-        const queryData = getQueryData(requests[0].url);
+        const queryData = getQueryData(server.requests[0].url);
         expect(queryData).to.include({
           'hb.we': '-1',
           'hb.g1': 'true'
diff --git a/test/spec/modules/prebidServerBidAdapter_spec.js b/test/spec/modules/prebidServerBidAdapter_spec.js
index c6c19f0f5c1..cf616e9ec8c 100644
--- a/test/spec/modules/prebidServerBidAdapter_spec.js
+++ b/test/spec/modules/prebidServerBidAdapter_spec.js
@@ -6,6 +6,7 @@ import { ajax } from 'src/ajax';
 import { config } from 'src/config';
 import events from 'src/events';
 import CONSTANTS from 'src/constants';
+import { server } from 'test/mocks/xhr';
 
 let CONFIG = {
   accountId: '1',
@@ -479,19 +480,13 @@ describe('S2S Adapter', function () {
   });
 
   describe('request function', function () {
-    let xhr;
-    let requests;
-
     beforeEach(function () {
-      xhr = sinon.useFakeXMLHttpRequest();
-      requests = [];
-      xhr.onCreate = request => requests.push(request);
       config.resetConfig();
       resetSyncedStatus();
     });
 
     afterEach(function () {
-      xhr.restore();
+      config.resetConfig();
     });
 
     it('should not add outstrean without renderer', function () {
@@ -501,7 +496,7 @@ describe('S2S Adapter', function () {
       config.setConfig({ s2sConfig: ortb2Config });
       adapter.callBids(OUTSTREAM_VIDEO_REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
 
-      const requestBid = JSON.parse(requests[0].requestBody);
+      const requestBid = JSON.parse(server.requests[0].requestBody);
       expect(requestBid.imp[0].banner).to.exist;
       expect(requestBid.imp[0].video).to.not.exist;
     });
@@ -530,7 +525,7 @@ describe('S2S Adapter', function () {
         };
 
         adapter.callBids(REQUEST, gdprBidRequest, addBidResponse, done, ajax);
-        let requestBid = JSON.parse(requests[0].requestBody);
+        let requestBid = JSON.parse(server.requests[0].requestBody);
 
         expect(requestBid.regs.ext.gdpr).is.equal(1);
         expect(requestBid.user.ext.consent).is.equal('abc123');
@@ -539,7 +534,7 @@ describe('S2S Adapter', function () {
         config.setConfig({ s2sConfig: CONFIG });
 
         adapter.callBids(REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
-        requestBid = JSON.parse(requests[1].requestBody);
+        requestBid = JSON.parse(server.requests[1].requestBody);
 
         expect(requestBid.regs).to.not.exist;
         expect(requestBid.user).to.not.exist;
@@ -560,7 +555,7 @@ describe('S2S Adapter', function () {
         };
 
         adapter.callBids(REQUEST, gdprBidRequest, addBidResponse, done, ajax);
-        let requestBid = JSON.parse(requests[0].requestBody);
+        let requestBid = JSON.parse(server.requests[0].requestBody);
 
         expect(requestBid.gdpr).is.equal(1);
         expect(requestBid.gdpr_consent).is.equal('abc123def');
@@ -582,7 +577,7 @@ describe('S2S Adapter', function () {
         };
 
         adapter.callBids(REQUEST, gdprBidRequest, addBidResponse, done, ajax);
-        let requestBid = JSON.parse(requests[0].requestBody);
+        let requestBid = JSON.parse(server.requests[0].requestBody);
 
         expect(requestBid.gdpr).is.equal(0);
         expect(requestBid.gdpr_consent).is.undefined;
@@ -602,7 +597,7 @@ describe('S2S Adapter', function () {
         };
 
         adapter.callBids(REQUEST, gdprBidRequest, addBidResponse, done, ajax);
-        let requestBid = JSON.parse(requests[0].requestBody);
+        let requestBid = JSON.parse(server.requests[0].requestBody);
 
         expect(requestBid.gdpr).is.undefined;
         expect(requestBid.gdpr_consent).is.undefined;
@@ -624,7 +619,7 @@ describe('S2S Adapter', function () {
         uspBidRequest[0].uspConsent = '1NYN';
 
         adapter.callBids(REQUEST, uspBidRequest, addBidResponse, done, ajax);
-        let requestBid = JSON.parse(requests[0].requestBody);
+        let requestBid = JSON.parse(server.requests[0].requestBody);
 
         expect(requestBid.regs.ext.us_privacy).is.equal('1NYN');
 
@@ -632,7 +627,7 @@ describe('S2S Adapter', function () {
         config.setConfig({ s2sConfig: CONFIG });
 
         adapter.callBids(REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
-        requestBid = JSON.parse(requests[1].requestBody);
+        requestBid = JSON.parse(server.requests[1].requestBody);
 
         expect(requestBid.regs).to.not.exist;
       });
@@ -646,7 +641,7 @@ describe('S2S Adapter', function () {
         uspBidRequest[0].uspConsent = '1YNN';
 
         adapter.callBids(REQUEST, uspBidRequest, addBidResponse, done, ajax);
-        let requestBid = JSON.parse(requests[0].requestBody);
+        let requestBid = JSON.parse(server.requests[0].requestBody);
 
         expect(requestBid.us_privacy).is.equal('1YNN');
         expect(requestBid.bidders).to.contain('appnexus').and.to.have.lengthOf(1);
@@ -673,7 +668,7 @@ describe('S2S Adapter', function () {
         };
 
         adapter.callBids(REQUEST, consentBidRequest, addBidResponse, done, ajax);
-        let requestBid = JSON.parse(requests[0].requestBody);
+        let requestBid = JSON.parse(server.requests[0].requestBody);
 
         expect(requestBid.regs.ext.us_privacy).is.equal('1NYN');
         expect(requestBid.regs.ext.gdpr).is.equal(1);
@@ -683,7 +678,7 @@ describe('S2S Adapter', function () {
         config.setConfig({ s2sConfig: CONFIG });
 
         adapter.callBids(REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
-        requestBid = JSON.parse(requests[1].requestBody);
+        requestBid = JSON.parse(server.requests[1].requestBody);
 
         expect(requestBid.regs).to.not.exist;
         expect(requestBid.user).to.not.exist;
@@ -702,7 +697,7 @@ describe('S2S Adapter', function () {
         };
 
         adapter.callBids(REQUEST, consentBidRequest, addBidResponse, done, ajax);
-        let requestBid = JSON.parse(requests[0].requestBody);
+        let requestBid = JSON.parse(server.requests[0].requestBody);
 
         expect(requestBid.us_privacy).is.equal('1YNN');
         expect(requestBid.gdpr).is.equal(1);
@@ -731,7 +726,7 @@ describe('S2S Adapter', function () {
       digiTrustBidRequest[0].bids[0].userId = { digitrustid: { data: digiTrustObj } };
 
       adapter.callBids(REQUEST, digiTrustBidRequest, addBidResponse, done, ajax);
-      let requestBid = JSON.parse(requests[0].requestBody);
+      let requestBid = JSON.parse(server.requests[0].requestBody);
 
       expect(requestBid.user.ext.digitrust).to.deep.equal({
         id: digiTrustObj.id,
@@ -741,7 +736,7 @@ describe('S2S Adapter', function () {
       digiTrustObj.privacy.optout = true;
 
       adapter.callBids(REQUEST, digiTrustBidRequest, addBidResponse, done, ajax);
-      requestBid = JSON.parse(requests[1].requestBody);
+      requestBid = JSON.parse(server.requests[1].requestBody);
 
       expect(requestBid.user && request.user.ext && requestBid.user.ext.digitrust).to.not.exist;
     });
@@ -755,7 +750,7 @@ describe('S2S Adapter', function () {
 
       config.setConfig(_config);
       adapter.callBids(REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
-      const requestBid = JSON.parse(requests[0].requestBody);
+      const requestBid = JSON.parse(server.requests[0].requestBody);
       expect(requestBid.device).to.deep.equal({
         ifa: '6D92078A-8246-4BA4-AE5B-76104861E7DC',
         w: window.innerWidth,
@@ -780,7 +775,7 @@ describe('S2S Adapter', function () {
 
       config.setConfig(_config);
       adapter.callBids(REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
-      const requestBid = JSON.parse(requests[0].requestBody);
+      const requestBid = JSON.parse(server.requests[0].requestBody);
       expect(requestBid.device).to.deep.equal({
         ifa: '6D92078A-8246-4BA4-AE5B-76104861E7DC',
         w: window.innerWidth,
@@ -804,7 +799,7 @@ describe('S2S Adapter', function () {
 
       config.setConfig(_config);
       adapter.callBids(REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
-      const requestBid = JSON.parse(requests[0].requestBody);
+      const requestBid = JSON.parse(server.requests[0].requestBody);
       expect(requestBid.device).to.deep.equal({
         w: window.innerWidth,
         h: window.innerHeight
@@ -826,7 +821,7 @@ describe('S2S Adapter', function () {
 
       config.setConfig(_config);
       adapter.callBids(REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
-      const requestBid = JSON.parse(requests[0].requestBody);
+      const requestBid = JSON.parse(server.requests[0].requestBody);
 
       expect(requestBid.imp[0].native).to.deep.equal({
         request: JSON.stringify({
@@ -885,7 +880,7 @@ describe('S2S Adapter', function () {
 
       config.setConfig(_config);
       adapter.callBids(REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
-      const requestBid = JSON.parse(requests[0].requestBody);
+      const requestBid = JSON.parse(server.requests[0].requestBody);
       expect(requestBid.site).to.exist.and.to.be.a('object');
       expect(requestBid.site.publisher).to.exist.and.to.be.a('object');
       expect(requestBid.site.page).to.exist.and.to.be.a('string');
@@ -907,7 +902,7 @@ describe('S2S Adapter', function () {
 
       adapter.callBids(request, BID_REQUESTS, addBidResponse, done, ajax);
 
-      const requestBid = JSON.parse(requests[0].requestBody);
+      const requestBid = JSON.parse(server.requests[0].requestBody);
 
       expect(requestBid.ext).to.deep.equal({
         prebid: {
@@ -941,7 +936,7 @@ describe('S2S Adapter', function () {
       $$PREBID_GLOBAL$$.aliasBidder('appnexus', alias);
       adapter.callBids(request, BID_REQUESTS, addBidResponse, done, ajax);
 
-      const requestBid = JSON.parse(requests[0].requestBody);
+      const requestBid = JSON.parse(server.requests[0].requestBody);
 
       expect(requestBid.ext).to.deep.equal({
         prebid: {
@@ -970,7 +965,7 @@ describe('S2S Adapter', function () {
       };
 
       adapter.callBids(myRequest, BID_REQUESTS, addBidResponse, done, ajax);
-      const requestBid = JSON.parse(requests[0].requestBody);
+      const requestBid = JSON.parse(server.requests[0].requestBody);
 
       expect(requestBid.imp[0].ext.appnexus).to.exist;
       expect(requestBid.imp[0].ext.appnexus.placement_id).to.exist.and.to.equal(10433394);
@@ -994,7 +989,7 @@ describe('S2S Adapter', function () {
 
       let bidRequest = utils.deepClone(BID_REQUESTS);
       adapter.callBids(REQUEST, bidRequest, addBidResponse, done, ajax);
-      let requestBid = JSON.parse(requests[0].requestBody);
+      let requestBid = JSON.parse(server.requests[0].requestBody);
 
       expect(requestBid.bidders).to.contain('appnexus').and.to.have.lengthOf(1);
       expect(requestBid.account).is.equal('1');
@@ -1008,7 +1003,7 @@ describe('S2S Adapter', function () {
 
       let bidRequest = utils.deepClone(BID_REQUESTS);
       adapter.callBids(REQUEST, bidRequest, addBidResponse, done, ajax);
-      let requestBid = JSON.parse(requests[0].requestBody);
+      let requestBid = JSON.parse(server.requests[0].requestBody);
 
       expect(requestBid.bidders).to.contain('appnexus').and.to.have.lengthOf(1);
       expect(requestBid.account).is.equal('1');
@@ -1020,7 +1015,7 @@ describe('S2S Adapter', function () {
 
       bidRequest = utils.deepClone(BID_REQUESTS);
       adapter.callBids(REQUEST, bidRequest, addBidResponse, done, ajax);
-      requestBid = JSON.parse(requests[0].requestBody);
+      requestBid = JSON.parse(server.requests[0].requestBody);
 
       expect(requestBid.bidders).to.contain('appnexus').and.to.have.lengthOf(1);
       expect(requestBid.account).is.equal('1');
@@ -1044,7 +1039,7 @@ describe('S2S Adapter', function () {
 
       config.setConfig(_config);
       adapter.callBids(REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
-      const requestBid = JSON.parse(requests[0].requestBody);
+      const requestBid = JSON.parse(server.requests[0].requestBody);
       expect(requestBid.imp[0].ext.appnexus).to.haveOwnProperty('key');
       expect(requestBid.imp[0].ext.appnexus.key).to.be.equal('value')
     });
@@ -1069,7 +1064,7 @@ describe('S2S Adapter', function () {
       };
 
       adapter.callBids(REQUEST, userIdBidRequest, addBidResponse, done, ajax);
-      let requestBid = JSON.parse(requests[0].requestBody);
+      let requestBid = JSON.parse(server.requests[0].requestBody);
       expect(typeof requestBid.user.ext.eids).is.equal('object');
       expect(Array.isArray(requestBid.user.ext.eids)).to.be.true;
       expect(requestBid.user.ext.eids.filter(eid => eid.source === 'adserver.org')).is.not.empty;
@@ -1098,7 +1093,7 @@ describe('S2S Adapter', function () {
       const bidRequests = utils.deepClone(BID_REQUESTS);
       adapter.callBids(REQUEST, bidRequests, addBidResponse, done, ajax);
 
-      const parsedRequestBody = JSON.parse(requests[0].requestBody);
+      const parsedRequestBody = JSON.parse(server.requests[0].requestBody);
       expect(parsedRequestBody.cur).to.deep.equal(['USD']);
     });
 
@@ -1113,7 +1108,7 @@ describe('S2S Adapter', function () {
       const bidRequests = utils.deepClone(BID_REQUESTS);
       adapter.callBids(REQUEST, bidRequests, addBidResponse, done, ajax);
 
-      const parsedRequestBody = JSON.parse(requests[1].requestBody);
+      const parsedRequestBody = JSON.parse(server.requests[1].requestBody);
       expect(parsedRequestBody.cur).to.deep.equal(['NZ']);
     });
 
@@ -1125,7 +1120,7 @@ describe('S2S Adapter', function () {
       const bidRequests = utils.deepClone(BID_REQUESTS);
       adapter.callBids(REQUEST, bidRequests, addBidResponse, done, ajax);
 
-      const parsedRequestBody = JSON.parse(requests[0].requestBody);
+      const parsedRequestBody = JSON.parse(server.requests[0].requestBody);
       expect(typeof parsedRequestBody.cur).to.equal('undefined');
     });
 
@@ -1146,7 +1141,7 @@ describe('S2S Adapter', function () {
 
       config.setConfig(_config);
       adapter.callBids(REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
-      const requestBid = JSON.parse(requests[0].requestBody);
+      const requestBid = JSON.parse(server.requests[0].requestBody);
 
       expect(requestBid.ext.prebid.targeting).to.haveOwnProperty('includebidderkeys');
       expect(requestBid.ext.prebid.targeting.includebidderkeys).to.equal(false);
@@ -1169,7 +1164,7 @@ describe('S2S Adapter', function () {
 
       config.setConfig(_config);
       adapter.callBids(REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
-      const requestBid = JSON.parse(requests[0].requestBody);
+      const requestBid = JSON.parse(server.requests[0].requestBody);
 
       expect(requestBid.ext.prebid.targeting).to.haveOwnProperty('includewinners');
       expect(requestBid.ext.prebid.targeting.includewinners).to.equal(true);
@@ -1190,7 +1185,7 @@ describe('S2S Adapter', function () {
 
       config.setConfig(_config);
       adapter.callBids(REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
-      const requestBid = JSON.parse(requests[0].requestBody);
+      const requestBid = JSON.parse(server.requests[0].requestBody);
 
       expect(requestBid).to.haveOwnProperty('ext');
       expect(requestBid.ext).to.haveOwnProperty('prebid');
@@ -1221,7 +1216,7 @@ describe('S2S Adapter', function () {
 
       config.setConfig(_config);
       adapter.callBids(REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
-      const requestBid = JSON.parse(requests[0].requestBody);
+      const requestBid = JSON.parse(server.requests[0].requestBody);
 
       expect(requestBid).to.haveOwnProperty('ext');
       expect(requestBid.ext).to.haveOwnProperty('prebid');
@@ -1254,7 +1249,7 @@ describe('S2S Adapter', function () {
 
       config.setConfig(_config);
       adapter.callBids(REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
-      const requestBid = JSON.parse(requests[0].requestBody);
+      const requestBid = JSON.parse(server.requests[0].requestBody);
 
       expect(requestBid).to.haveOwnProperty('ext');
       expect(requestBid.ext).to.haveOwnProperty('prebid');
diff --git a/test/spec/modules/prebidmanagerAnalyticsAdapter_spec.js b/test/spec/modules/prebidmanagerAnalyticsAdapter_spec.js
index cd414a70236..fcff6837ece 100644
--- a/test/spec/modules/prebidmanagerAnalyticsAdapter_spec.js
+++ b/test/spec/modules/prebidmanagerAnalyticsAdapter_spec.js
@@ -1,12 +1,10 @@
 import prebidmanagerAnalytics from 'modules/prebidmanagerAnalyticsAdapter';
 import {expect} from 'chai';
+import {server} from 'test/mocks/xhr';
 let events = require('src/events');
 let constants = require('src/constants.json');
 
 describe('Prebid Manager Analytics Adapter', function () {
-  let xhr;
-  let requests;
-
   let bidWonEvent = {
     'bidderCode': 'appnexus',
     'width': 300,
@@ -33,18 +31,8 @@ describe('Prebid Manager Analytics Adapter', function () {
     'adUrl': 'ad url'
   };
 
-  before(function () {
-    xhr = sinon.useFakeXMLHttpRequest();
-    xhr.onCreate = request => requests.push(request);
-  });
-
-  after(function () {
-    xhr.restore();
-  });
-
   describe('Prebid Manager Analytic tests', function () {
     beforeEach(function () {
-      requests = [];
       sinon.stub(events, 'getEvents').returns([]);
     });
 
@@ -67,7 +55,6 @@ describe('Prebid Manager Analytics Adapter', function () {
     });
 
     it('bid won event', function() {
-      xhr.onCreate = request => requests.push(request);
       let bundleId = 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx';
       prebidmanagerAnalytics.enableAnalytics({
         provider: 'prebidmanager',
@@ -79,11 +66,11 @@ describe('Prebid Manager Analytics Adapter', function () {
       events.emit(constants.EVENTS.BID_WON, bidWonEvent);
       prebidmanagerAnalytics.flush();
 
-      expect(requests.length).to.equal(1);
-      expect(requests[0].url).to.equal('https://endpoint.prebidmanager.com/endpoint');
-      expect(requests[0].requestBody.substring(0, 2)).to.equal('1:');
+      expect(server.requests.length).to.equal(1);
+      expect(server.requests[0].url).to.equal('https://endpoint.prebidmanager.com/endpoint');
+      expect(server.requests[0].requestBody.substring(0, 2)).to.equal('1:');
 
-      const pmEvents = JSON.parse(requests[0].requestBody.substring(2));
+      const pmEvents = JSON.parse(server.requests[0].requestBody.substring(2));
       expect(pmEvents.pageViewId).to.exist;
       expect(pmEvents.bundleId).to.equal(bundleId);
       expect(pmEvents.ver).to.equal(1);
diff --git a/test/spec/modules/pubwiseAnalyticsAdapter_spec.js b/test/spec/modules/pubwiseAnalyticsAdapter_spec.js
index b77788fff4a..b2235212cbf 100644
--- a/test/spec/modules/pubwiseAnalyticsAdapter_spec.js
+++ b/test/spec/modules/pubwiseAnalyticsAdapter_spec.js
@@ -4,14 +4,7 @@ let adapterManager = require('src/adapterManager').default;
 let constants = require('src/constants.json');
 
 describe('PubWise Prebid Analytics', function () {
-  let xhr;
-
-  before(function () {
-    xhr = sinon.useFakeXMLHttpRequest();
-  });
-
   after(function () {
-    xhr.restore();
     pubwiseAnalytics.disableAnalytics();
   });
 
diff --git a/test/spec/modules/roxotAnalyticsAdapter_spec.js b/test/spec/modules/roxotAnalyticsAdapter_spec.js
index d40ceb61cd5..1ad6ba2e86a 100644
--- a/test/spec/modules/roxotAnalyticsAdapter_spec.js
+++ b/test/spec/modules/roxotAnalyticsAdapter_spec.js
@@ -1,13 +1,11 @@
 import roxotAnalytic from 'modules/roxotAnalyticsAdapter';
 import {expect} from 'chai';
+import {server} from 'test/mocks/xhr';
 
 let events = require('src/events');
 let constants = require('src/constants.json');
 
 describe('Roxot Prebid Analytic', function () {
-  let xhr;
-  let requests;
-
   let roxotConfigServerUrl = 'config-server';
   let roxotEventServerUrl = 'event-server';
   let publisherId = 'test_roxot_prebid_analytics_publisher_id';
@@ -161,17 +159,8 @@ describe('Roxot Prebid Analytic', function () {
   let bidderDone = bidRequested;
   let bidWon = bidAdjustmentWithBid;
 
-  before(function () {
-    xhr = sinon.useFakeXMLHttpRequest();
-    xhr.onCreate = request => requests.push(request);
-  });
-  after(function () {
-    xhr.restore();
-  });
-
   describe('correct build and send events', function () {
     beforeEach(function () {
-      requests = [];
       sinon.stub(events, 'getEvents').returns([]);
     });
     afterEach(function () {
@@ -188,9 +177,9 @@ describe('Roxot Prebid Analytic', function () {
         }
       });
 
-      expect(requests.length).to.equal(1);
-      expect(requests[0].url).to.equal('https://' + roxotConfigServerUrl + '/c?publisherId=' + publisherId + '&host=localhost');
-      requests[0].respond(200, {'Content-Type': 'application/json'}, '{"a": 1, "i": 1, "bat": 1}');
+      expect(server.requests.length).to.equal(1);
+      expect(server.requests[0].url).to.equal('https://' + roxotConfigServerUrl + '/c?publisherId=' + publisherId + '&host=localhost');
+      server.requests[0].respond(200, {'Content-Type': 'application/json'}, '{"a": 1, "i": 1, "bat": 1}');
 
       events.emit(constants.EVENTS.AUCTION_INIT, auctionInit);
       events.emit(constants.EVENTS.BID_REQUESTED, bidRequested);
@@ -205,13 +194,13 @@ describe('Roxot Prebid Analytic', function () {
       events.emit(constants.EVENTS.BIDDER_DONE, bidderDone);
       events.emit(constants.EVENTS.BID_WON, bidWon);
 
-      expect(requests.length).to.equal(4);
+      expect(server.requests.length).to.equal(4);
 
-      expect(requests[1].url).to.equal('https://' + roxotEventServerUrl + '/a?publisherId=' + publisherId + '&host=localhost');
-      expect(requests[2].url).to.equal('https://' + roxotEventServerUrl + '/bat?publisherId=' + publisherId + '&host=localhost');
-      expect(requests[3].url).to.equal('https://' + roxotEventServerUrl + '/i?publisherId=' + publisherId + '&host=localhost');
+      expect(server.requests[1].url).to.equal('https://' + roxotEventServerUrl + '/a?publisherId=' + publisherId + '&host=localhost');
+      expect(server.requests[2].url).to.equal('https://' + roxotEventServerUrl + '/bat?publisherId=' + publisherId + '&host=localhost');
+      expect(server.requests[3].url).to.equal('https://' + roxotEventServerUrl + '/i?publisherId=' + publisherId + '&host=localhost');
 
-      let auction = JSON.parse(requests[1].requestBody);
+      let auction = JSON.parse(server.requests[1].requestBody);
       expect(auction).to.include.all.keys('event', 'eventName', 'options', 'data');
       expect(auction.event).to.equal('a');
 
@@ -228,7 +217,7 @@ describe('Roxot Prebid Analytic', function () {
       expect(auction.data.adUnits[bidAfterTimeoutAdUnit].bidders[bidder].status).to.equal('timeout');
       expect(auction.data.adUnits[noBidAdUnit].bidders[bidder].status).to.equal('noBid');
 
-      let bidAfterTimeout = JSON.parse(requests[2].requestBody);
+      let bidAfterTimeout = JSON.parse(server.requests[2].requestBody);
       expect(bidAfterTimeout).to.include.all.keys('event', 'eventName', 'options', 'data');
       expect(bidAfterTimeout.event).to.equal('bat');
 
@@ -237,7 +226,7 @@ describe('Roxot Prebid Analytic', function () {
       expect(bidAfterTimeout.data.bidder).to.equal(bidder);
       expect(bidAfterTimeout.data.cpm).to.equal(bidAdjustmentAfterTimeout.cpm);
 
-      let impression = JSON.parse(requests[3].requestBody);
+      let impression = JSON.parse(server.requests[3].requestBody);
       expect(impression).to.include.all.keys('event', 'eventName', 'options', 'data');
       expect(impression.event).to.equal('i');
 
@@ -250,7 +239,6 @@ describe('Roxot Prebid Analytic', function () {
 
   describe('support ad unit filter', function () {
     beforeEach(function () {
-      requests = [];
       sinon.stub(events, 'getEvents').returns([]);
     });
     afterEach(function () {
@@ -268,9 +256,9 @@ describe('Roxot Prebid Analytic', function () {
         }
       });
 
-      expect(requests.length).to.equal(1);
-      expect(requests[0].url).to.equal('https://' + roxotConfigServerUrl + '/c?publisherId=' + publisherId + '&host=localhost');
-      requests[0].respond(200, {'Content-Type': 'application/json'}, '{"a": 1, "i": 1, "bat": 1}');
+      expect(server.requests.length).to.equal(1);
+      expect(server.requests[0].url).to.equal('https://' + roxotConfigServerUrl + '/c?publisherId=' + publisherId + '&host=localhost');
+      server.requests[0].respond(200, {'Content-Type': 'application/json'}, '{"a": 1, "i": 1, "bat": 1}');
 
       events.emit(constants.EVENTS.AUCTION_INIT, auctionInit);
       events.emit(constants.EVENTS.BID_REQUESTED, bidRequested);
@@ -285,12 +273,12 @@ describe('Roxot Prebid Analytic', function () {
       events.emit(constants.EVENTS.BIDDER_DONE, bidderDone);
       events.emit(constants.EVENTS.BID_WON, bidWon);
 
-      expect(requests.length).to.equal(3);
+      expect(server.requests.length).to.equal(3);
 
-      expect(requests[1].url).to.equal('https://' + roxotEventServerUrl + '/a?publisherId=' + publisherId + '&host=localhost');
-      expect(requests[2].url).to.equal('https://' + roxotEventServerUrl + '/bat?publisherId=' + publisherId + '&host=localhost');
+      expect(server.requests[1].url).to.equal('https://' + roxotEventServerUrl + '/a?publisherId=' + publisherId + '&host=localhost');
+      expect(server.requests[2].url).to.equal('https://' + roxotEventServerUrl + '/bat?publisherId=' + publisherId + '&host=localhost');
 
-      let auction = JSON.parse(requests[1].requestBody);
+      let auction = JSON.parse(server.requests[1].requestBody);
       expect(auction.data.adUnits).to.include.all.keys(noBidAdUnit, bidAfterTimeoutAdUnit);
       expect(auction.data.adUnits).to.not.include.all.keys(bidAdUnit);
     });
@@ -298,7 +286,6 @@ describe('Roxot Prebid Analytic', function () {
 
   describe('should correct parse config', function () {
     beforeEach(function () {
-      requests = [];
       sinon.stub(events, 'getEvents').returns([]);
     });
 
@@ -421,7 +408,7 @@ describe('Roxot Prebid Analytic', function () {
         options: publisherOptions
       });
 
-      requests[0].respond(500);
+      server.requests[0].respond(500);
 
       expect(roxotAnalytic.getOptions().serverConfig).to.deep.equal({a: 1, i: 1, bat: 1, isError: 1});
     });
diff --git a/test/spec/modules/rubiconAnalyticsAdapter_spec.js b/test/spec/modules/rubiconAnalyticsAdapter_spec.js
index a4d07c35bc4..83d43086f90 100644
--- a/test/spec/modules/rubiconAnalyticsAdapter_spec.js
+++ b/test/spec/modules/rubiconAnalyticsAdapter_spec.js
@@ -1,6 +1,7 @@
 import rubiconAnalyticsAdapter, { SEND_TIMEOUT, parseBidResponse } from 'modules/rubiconAnalyticsAdapter';
 import CONSTANTS from 'src/constants.json';
 import { config } from 'src/config';
+import { server } from 'test/mocks/xhr';
 
 import {
   setConfig,
@@ -476,18 +477,12 @@ function performStandardAuction() {
 
 describe('rubicon analytics adapter', function () {
   let sandbox;
-  let xhr;
-  let requests;
   let oldScreen;
   let clock;
 
   beforeEach(function () {
     sandbox = sinon.sandbox.create();
 
-    xhr = sandbox.useFakeXMLHttpRequest();
-    requests = [];
-    xhr.onCreate = request => requests.push(request);
-
     sandbox.stub(events, 'getEvents').returns([]);
 
     clock = sandbox.useFakeTimers(1519767013781);
@@ -554,7 +549,7 @@ describe('rubicon analytics adapter', function () {
 
         performStandardAuction();
 
-        expect(requests.length).to.equal(1);
+        expect(server.requests.length).to.equal(1);
       });
 
       it('should unsample', function () {
@@ -568,7 +563,7 @@ describe('rubicon analytics adapter', function () {
 
         performStandardAuction();
 
-        expect(requests.length).to.equal(0);
+        expect(server.requests.length).to.equal(0);
       });
 
       it('should throw errors for invalid samplingFactor', function () {
@@ -582,7 +577,7 @@ describe('rubicon analytics adapter', function () {
 
         performStandardAuction();
 
-        expect(requests.length).to.equal(0);
+        expect(server.requests.length).to.equal(0);
         expect(utils.logError.called).to.equal(true);
       });
     });
@@ -598,7 +593,7 @@ describe('rubicon analytics adapter', function () {
 
         performStandardAuction();
 
-        expect(requests.length).to.equal(1);
+        expect(server.requests.length).to.equal(1);
       });
 
       it('should unsample', function () {
@@ -612,7 +607,7 @@ describe('rubicon analytics adapter', function () {
 
         performStandardAuction();
 
-        expect(requests.length).to.equal(0);
+        expect(server.requests.length).to.equal(0);
       });
 
       it('should throw errors for invalid samplingFactor', function () {
@@ -626,7 +621,7 @@ describe('rubicon analytics adapter', function () {
 
         performStandardAuction();
 
-        expect(requests.length).to.equal(0);
+        expect(server.requests.length).to.equal(0);
         expect(utils.logError.called).to.equal(true);
       });
     });
@@ -649,8 +644,8 @@ describe('rubicon analytics adapter', function () {
     it('should build a batched message from prebid events', function () {
       performStandardAuction();
 
-      expect(requests.length).to.equal(1);
-      let request = requests[0];
+      expect(server.requests.length).to.equal(1);
+      let request = server.requests[0];
 
       expect(request.url).to.equal('//localhost:9999/event');
 
@@ -724,15 +719,15 @@ describe('rubicon analytics adapter', function () {
 
       events.emit(BID_WON, MOCK.BID_WON[1]);
 
-      expect(requests.length).to.equal(2);
+      expect(server.requests.length).to.equal(2);
 
-      let message = JSON.parse(requests[0].requestBody);
+      let message = JSON.parse(server.requests[0].requestBody);
       validate(message);
       expect(message.bidsWon.length).to.equal(1);
       expect(message.auctions).to.deep.equal(ANALYTICS_MESSAGE.auctions);
       expect(message.bidsWon[0]).to.deep.equal(ANALYTICS_MESSAGE.bidsWon[0]);
 
-      message = JSON.parse(requests[1].requestBody);
+      message = JSON.parse(server.requests[1].requestBody);
       validate(message);
       expect(message.bidsWon.length).to.equal(1);
       expect(message).to.not.have.property('auctions');
@@ -747,9 +742,9 @@ describe('rubicon analytics adapter', function () {
 
       clock.tick(SEND_TIMEOUT + 1000);
 
-      expect(requests.length).to.equal(1);
+      expect(server.requests.length).to.equal(1);
 
-      let message = JSON.parse(requests[0].requestBody);
+      let message = JSON.parse(server.requests[0].requestBody);
       validate(message);
       let timedOutBid = message.auctions[0].adUnits[0].bids[0];
       expect(timedOutBid.status).to.equal('error');
@@ -804,8 +799,8 @@ describe('rubicon analytics adapter', function () {
 
       performStandardAuction();
 
-      expect(requests.length).to.equal(1);
-      const request = requests[0];
+      expect(server.requests.length).to.equal(1);
+      const request = server.requests[0];
       const message = JSON.parse(request.requestBody);
       expect(message.integration).to.equal('testType');
 
diff --git a/test/spec/modules/scaleableAnalyticsAdapter_spec.js b/test/spec/modules/scaleableAnalyticsAdapter_spec.js
index 300f72751a4..f26d91f7aa1 100644
--- a/test/spec/modules/scaleableAnalyticsAdapter_spec.js
+++ b/test/spec/modules/scaleableAnalyticsAdapter_spec.js
@@ -2,7 +2,7 @@ import scaleableAnalytics from 'modules/scaleableAnalyticsAdapter';
 import { expect } from 'chai';
 import events from 'src/events';
 import CONSTANTS from 'src/constants.json';
-import adapterManager from 'src/adapterManager';
+import { server } from 'test/mocks/xhr';
 
 const BID_TIMEOUT = CONSTANTS.EVENTS.BID_TIMEOUT;
 const AUCTION_INIT = CONSTANTS.EVENTS.AUCTION_INIT;
@@ -47,21 +47,8 @@ describe('Scaleable Analytics Adapter', function() {
     site: MOCK_DATA.site
   };
 
-  let xhr;
-  let requests;
-
-  before(function() {
-    xhr = sinon.useFakeXMLHttpRequest();
-    xhr.onCreate = request => requests.push(request);
-  });
-
-  after(function() {
-    xhr.restore();
-  });
-
   describe('Event Handling', function() {
     beforeEach(function() {
-      requests = [];
       sinon.stub(events, 'getEvents').returns([]);
 
       scaleableAnalytics.enableAnalytics({
@@ -82,7 +69,7 @@ describe('Scaleable Analytics Adapter', function() {
         adUnitCodes: [MOCK_DATA.adUnitCode]
       });
 
-      const result = JSON.parse(requests[0].requestBody);
+      const result = JSON.parse(server.requests[0].requestBody);
       expect(result).to.deep.equal({
         event: 'request',
         site: MOCK_DATA.site,
@@ -111,7 +98,7 @@ describe('Scaleable Analytics Adapter', function() {
     it('should handle the bid won event', function(done) {
       events.emit(BID_WON, MOCK_DATA.bidResponse);
 
-      const result = JSON.parse(requests[0].requestBody);
+      const result = JSON.parse(server.requests[0].requestBody);
       expect(result).to.deep.equal({
         adunit: MOCK_DATA.adUnitCode,
         code: MOCK_DATA.bidResponse.bidderCode,
@@ -127,7 +114,7 @@ describe('Scaleable Analytics Adapter', function() {
     it('should handle the auction end event', function(done) {
       events.emit(AUCTION_END, {});
 
-      const result = JSON.parse(requests[0].requestBody);
+      const result = JSON.parse(server.requests[0].requestBody);
       expect(result).to.deep.equal(MOCK_DATA.expectedBidResponse);
 
       done();
diff --git a/test/spec/modules/serverbidServerBidAdapter_spec.js b/test/spec/modules/serverbidServerBidAdapter_spec.js
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/test/spec/modules/sigmoidAnalyticsAdapter_spec.js b/test/spec/modules/sigmoidAnalyticsAdapter_spec.js
index 0dee6337e0d..c07d35ae68f 100644
--- a/test/spec/modules/sigmoidAnalyticsAdapter_spec.js
+++ b/test/spec/modules/sigmoidAnalyticsAdapter_spec.js
@@ -5,13 +5,8 @@ let adapterManager = require('src/adapterManager').default;
 let constants = require('src/constants.json');
 
 describe('sigmoid Prebid Analytic', function () {
-  let xhr;
-  before(function () {
-    xhr = sinon.useFakeXMLHttpRequest();
-  })
   after(function () {
     sigmoidAnalytic.disableAnalytics();
-    xhr.restore();
   });
 
   describe('enableAnalytics', function () {
diff --git a/test/spec/modules/sonobiAnalyticsAdapter_spec.js b/test/spec/modules/sonobiAnalyticsAdapter_spec.js
index 389dfee34f9..d857c060f90 100644
--- a/test/spec/modules/sonobiAnalyticsAdapter_spec.js
+++ b/test/spec/modules/sonobiAnalyticsAdapter_spec.js
@@ -1,25 +1,20 @@
 import sonobiAnalytics from 'modules/sonobiAnalyticsAdapter';
 import {expect} from 'chai';
+import {server} from 'test/mocks/xhr';
 let events = require('src/events');
 let adapterManager = require('src/adapterManager').default;
 let constants = require('src/constants.json');
 
 describe('Sonobi Prebid Analytic', function () {
-  let xhr;
-  let requests = [];
   var clock;
 
   describe('enableAnalytics', function () {
     beforeEach(function () {
-      requests = [];
-      xhr = sinon.useFakeXMLHttpRequest();
-      xhr.onCreate = request => requests.push(request);
       sinon.stub(events, 'getEvents').returns([]);
       clock = sinon.useFakeTimers(Date.now());
     });
 
     afterEach(function () {
-      xhr.restore();
       events.getEvents.restore();
       clock.restore();
     });
@@ -81,8 +76,8 @@ describe('Sonobi Prebid Analytic', function () {
       events.emit(constants.EVENTS.AUCTION_END, {auctionId: '13', bidsReceived: [bid]});
 
       clock.tick(5000);
-      expect(requests).to.have.length(1);
-      expect(JSON.parse(requests[0].requestBody)).to.have.length(3)
+      expect(server.requests).to.have.length(1);
+      expect(JSON.parse(server.requests[0].requestBody)).to.have.length(3)
       done();
     });
   });
diff --git a/test/spec/modules/sortableAnalyticsAdapter_spec.js b/test/spec/modules/sortableAnalyticsAdapter_spec.js
index 90bd5fcdf22..866f3fcb512 100644
--- a/test/spec/modules/sortableAnalyticsAdapter_spec.js
+++ b/test/spec/modules/sortableAnalyticsAdapter_spec.js
@@ -3,11 +3,10 @@ import sortableAnalyticsAdapter, {TIMEOUT_FOR_REGISTRY, DEFAULT_PBID_TIMEOUT} fr
 import events from 'src/events';
 import CONSTANTS from 'src/constants.json';
 import * as prebidGlobal from 'src/prebidGlobal';
+import {server} from 'test/mocks/xhr';
 
 describe('Sortable Analytics Adapter', function() {
-  let requests;
   let sandbox;
-  let xhr;
   let clock;
 
   const initialConfig = {
@@ -137,8 +136,6 @@ describe('Sortable Analytics Adapter', function() {
 
   beforeEach(function() {
     sandbox = sinon.sandbox.create();
-    xhr = sandbox.useFakeXMLHttpRequest();
-    xhr.onCreate = (request) => requests.push(request);
     clock = sandbox.useFakeTimers();
     sandbox.stub(events, 'getEvents').returns([]);
     sandbox.stub(prebidGlobal, 'getGlobal').returns({
@@ -152,7 +149,6 @@ describe('Sortable Analytics Adapter', function() {
       }
     });
 
-    requests = [];
     sortableAnalyticsAdapter.enableAnalytics(initialConfig);
   });
 
@@ -190,8 +186,8 @@ describe('Sortable Analytics Adapter', function() {
 
       clock.tick(DEFAULT_PBID_TIMEOUT);
 
-      expect(requests.length).to.equal(1);
-      let result = JSON.parse(requests[0].requestBody);
+      expect(server.requests.length).to.equal(1);
+      let result = JSON.parse(server.requests[0].requestBody);
       expect(result).to.have.own.property('pbid');
       expect(result.pbid).to.deep.include({
         ai: 'fb8d579a-5c3f-4705-ab94-3cff39005d9e',
@@ -242,10 +238,10 @@ describe('Sortable Analytics Adapter', function() {
 
       clock.tick(TIMEOUT_FOR_REGISTRY);
 
-      expect(requests.length).to.equal(2);
-      const pbid_req = JSON.parse(requests[0].requestBody);
+      expect(server.requests.length).to.equal(2);
+      const pbid_req = JSON.parse(server.requests[0].requestBody);
       expect(pbid_req).to.have.own.property('pbid');
-      const pbwon_req = JSON.parse(requests[1].requestBody);
+      const pbwon_req = JSON.parse(server.requests[1].requestBody);
       expect(pbwon_req).to.have.own.property('pbrw');
       expect(pbwon_req.pbrw).to.deep.equal({
         ac: '300x250',
@@ -270,10 +266,10 @@ describe('Sortable Analytics Adapter', function() {
 
       clock.tick(TIMEOUT_FOR_REGISTRY);
 
-      expect(requests.length).to.equal(2);
-      const pbid_req = JSON.parse(requests[0].requestBody);
+      expect(server.requests.length).to.equal(2);
+      const pbid_req = JSON.parse(server.requests[0].requestBody);
       expect(pbid_req).to.have.own.property('pbid');
-      const pbto_req = JSON.parse(requests[1].requestBody);
+      const pbto_req = JSON.parse(server.requests[1].requestBody);
       expect(pbto_req).to.have.own.property('pbto');
       expect(pbto_req.pbto).to.deep.equal({
         ai: 'fb8d579a-5c3f-4705-ab94-3cff39005d9e',
@@ -291,8 +287,8 @@ describe('Sortable Analytics Adapter', function() {
 
       clock.tick(TIMEOUT_FOR_REGISTRY);
 
-      expect(requests.length).to.equal(1);
-      const err_req = JSON.parse(requests[0].requestBody);
+      expect(server.requests.length).to.equal(1);
+      const err_req = JSON.parse(server.requests[0].requestBody);
       expect(err_req).to.have.own.property('pber');
       expect(err_req.pber).to.include({
         args: '{}',
diff --git a/test/spec/modules/sovrnAnalyticsAdapter_spec.js b/test/spec/modules/sovrnAnalyticsAdapter_spec.js
index 299e22ca790..25c615f0d5c 100644
--- a/test/spec/modules/sovrnAnalyticsAdapter_spec.js
+++ b/test/spec/modules/sovrnAnalyticsAdapter_spec.js
@@ -1,7 +1,8 @@
-import sovrnAnalyticsAdapter from '../../../modules/sovrnAnalyticsAdapter'
-import { expect } from 'chai'
-import {config} from 'src/config'
-import adaptermanager from 'src/adapterManager'
+import sovrnAnalyticsAdapter from '../../../modules/sovrnAnalyticsAdapter';
+import { expect } from 'chai';
+import {config} from 'src/config';
+import adaptermanager from 'src/adapterManager';
+import { server } from 'test/mocks/xhr';
 var assert = require('assert');
 
 let events = require('src/events');
@@ -171,16 +172,10 @@ let bidAdjustmentNoMatchingRequest = {
 let bidResponseNoMatchingRequest = bidAdjustmentNoMatchingRequest;
 
 describe('Sovrn Analytics Adapter', function () {
-  let xhr;
-  let requests;
   beforeEach(() => {
-    xhr = sinon.useFakeXMLHttpRequest();
-    xhr.onCreate = request => requests.push(request);
-    requests = [];
     sinon.stub(events, 'getEvents').returns([]);
   });
   afterEach(() => {
-    xhr.restore();
     events.getEvents.restore();
   });
 
@@ -436,7 +431,7 @@ describe('Sovrn Analytics Adapter', function () {
       emitEvent('BID_RESPONSE', bidResponse, auctionId);
       emitEvent('BID_RESPONSE', bidResponse2, auctionId)
       emitEvent('AUCTION_END', {}, auctionId);
-      let requestBody = JSON.parse(requests[0].requestBody);
+      let requestBody = JSON.parse(server.requests[0].requestBody);
       let requestsFromRequestBody = requestBody.requests[0];
       let bidsFromRequests = requestsFromRequestBody.bids[0];
       expect(requestBody).to.deep.include(expectedPostBody);
@@ -512,7 +507,7 @@ describe('Sovrn Analytics Adapter', function () {
     it('should send bid won data ', function () {
       emitEvent('AUCTION_INIT', auctionInit, auctionId);
       emitEvent('BID_WON', bidWonEvent, auctionId);
-      let requestBody = JSON.parse(requests[0].requestBody);
+      let requestBody = JSON.parse(server.requests[0].requestBody);
       expect(requestBody).to.deep.include(expectedBidWonBody);
       expect(requestBody.winningBid).to.deep.include(expectedWinningBid);
     });
@@ -536,9 +531,9 @@ describe('Sovrn Analytics Adapter', function () {
       emitEvent('AUCTION_INIT', auctionInit, auctionId)
       emitEvent('BID_REQUESTED', bidRequested, auctionId)
       emitEvent('AUCTION_END', {}, auctionId)
-      requests[0].respond(200)
+      server.requests[0].respond(200)
       emitEvent('BID_RESPONSE', bidResponse, auctionId)
-      let requestBody = JSON.parse(requests[1].requestBody)
+      let requestBody = JSON.parse(server.requests[1].requestBody)
       expect(requestBody.payload).to.equal('error')
       expect(requestBody.message).to.include('Event Received after Auction Close Auction Id')
     })
diff --git a/test/spec/modules/vubleAnalyticsAdapter_spec.js b/test/spec/modules/vubleAnalyticsAdapter_spec.js
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/test/spec/unit/core/bidderFactory_spec.js b/test/spec/unit/core/bidderFactory_spec.js
index e8ddf52c128..e1b2f205bf7 100644
--- a/test/spec/unit/core/bidderFactory_spec.js
+++ b/test/spec/unit/core/bidderFactory_spec.js
@@ -2,10 +2,10 @@ import { newBidder, registerBidder, preloadBidderMappingFile } from 'src/adapter
 import adapterManager from 'src/adapterManager';
 import * as ajax from 'src/ajax';
 import { expect } from 'chai';
-import { STATUS } from 'src/constants';
 import { userSync } from 'src/userSync'
 import * as utils from 'src/utils';
 import { config } from 'src/config';
+import { server } from 'test/mocks/xhr';
 
 const CODE = 'sampleBidder';
 const MOCK_BIDS_REQUEST = {
@@ -792,7 +792,7 @@ describe('preload mapping url hook', function() {
   let adapterManagerStub;
 
   beforeEach(function () {
-    fakeTranslationServer = sinon.fakeServer.create();
+    fakeTranslationServer = server;
     getLocalStorageStub = sinon.stub(utils, 'getDataFromLocalStorage');
     adapterManagerStub = sinon.stub(adapterManager, 'getBidAdapter');
   });
diff --git a/test/spec/unit/pbjs_api_spec.js b/test/spec/unit/pbjs_api_spec.js
index b59911153e5..094220ea521 100644
--- a/test/spec/unit/pbjs_api_spec.js
+++ b/test/spec/unit/pbjs_api_spec.js
@@ -1142,7 +1142,6 @@ describe('Unit: Prebid Module', function () {
   describe('requestBids', function () {
     let logMessageSpy;
     let makeRequestsStub;
-    let xhr;
     let adUnits;
     let clock;
     let bidsBackHandlerStub = sinon.stub();
@@ -1186,7 +1185,6 @@ describe('Unit: Prebid Module', function () {
       logMessageSpy = sinon.spy(utils, 'logMessage');
       makeRequestsStub = sinon.stub(adapterManager, 'makeBidRequests');
       makeRequestsStub.returns(bidRequests);
-      xhr = sinon.useFakeXMLHttpRequest();
 
       adUnits = [{
         code: 'adUnit-code',
@@ -1215,7 +1213,6 @@ describe('Unit: Prebid Module', function () {
       adapterManager.makeBidRequests.restore();
       auctionModule.newAuction.restore();
       utils.logMessage.restore();
-      xhr.restore();
     });
 
     it('should execute callback after timeout', function () {
@@ -1337,18 +1334,6 @@ describe('Unit: Prebid Module', function () {
   });
 
   describe('requestBids', function () {
-    let xhr;
-    let requests;
-
-    beforeEach(function () {
-      xhr = sinon.useFakeXMLHttpRequest();
-      requests = [];
-      xhr.onCreate = request => requests.push(request);
-    });
-
-    afterEach(function () {
-      xhr.restore();
-    });
     var adUnitsBackup;
     var auctionManagerStub;
     let logMessageSpy;
diff --git a/test/spec/videoCache_spec.js b/test/spec/videoCache_spec.js
index 8f423a799ac..e2a1b106554 100644
--- a/test/spec/videoCache_spec.js
+++ b/test/spec/videoCache_spec.js
@@ -2,6 +2,7 @@ import 'mocha/mocha';
 import chai from 'chai';
 import { getCacheUrl, store } from 'src/videoCache';
 import { config } from 'src/config';
+import { server } from 'test/mocks/xhr';
 
 const should = chai.should();
 
@@ -17,24 +18,11 @@ describe('The video cache', function () {
   }
 
   describe('when the cache server is unreachable', function () {
-    let xhr;
-    let requests;
-
-    beforeEach(function () {
-      xhr = sinon.useFakeXMLHttpRequest();
-      requests = [];
-      xhr.onCreate = (request) => requests.push(request);
-    });
-
-    afterEach(function () {
-      xhr.restore();
-    });
-
     it('should execute the callback with an error when store() is called', function () {
       const callback = sinon.spy();
       store([{ vastUrl: 'my-mock-url.com' }], callback);
 
-      requests[0].respond(503, {
+      server.requests[0].respond(503, {
         'Content-Type': 'plain/text',
       }, 'The server could not save anything at the moment.');
 
@@ -44,13 +32,7 @@ describe('The video cache', function () {
   });
 
   describe('when the cache server is available', function () {
-    let xhr;
-    let requests;
-
     beforeEach(function () {
-      xhr = sinon.useFakeXMLHttpRequest();
-      requests = [];
-      xhr.onCreate = (request) => requests.push(request);
       config.setConfig({
         cache: {
           url: 'https://prebid.adnxs.com/pbc/v1/cache'
@@ -59,7 +41,6 @@ describe('The video cache', function () {
     });
 
     afterEach(function () {
-      xhr.restore();
       config.resetConfig();
     });
 
@@ -139,7 +120,7 @@ describe('The video cache', function () {
       }];
 
       store(bids, function () { });
-      const request = requests[0];
+      const request = server.requests[0];
       request.method.should.equal('POST');
       request.url.should.equal('https://prebid.adnxs.com/pbc/v1/cache');
       request.requestHeaders['Content-Type'].should.equal('text/plain;charset=utf-8');
@@ -215,7 +196,7 @@ describe('The video cache', function () {
     function assertRequestMade(bid, expectedValue) {
       store([bid], function () { });
 
-      const request = requests[0];
+      const request = server.requests[0];
       request.method.should.equal('POST');
       request.url.should.equal('https://prebid.adnxs.com/pbc/v1/cache');
       request.requestHeaders['Content-Type'].should.equal('text/plain;charset=utf-8');
@@ -232,7 +213,7 @@ describe('The video cache', function () {
     function fakeServerCall(bid, responseBody) {
       const callback = sinon.spy();
       store([bid], callback);
-      requests[0].respond(
+      server.requests[0].respond(
         200,
         {
           'Content-Type': 'application/json',
diff --git a/test/test_index.js b/test/test_index.js
index 206f1be1f52..53d75e36176 100644
--- a/test/test_index.js
+++ b/test/test_index.js
@@ -1,5 +1,6 @@
 require('test/helpers/prebidGlobal.js');
 require('test/mocks/adloaderStub.js');
+require('test/mocks/xhr.js');
 
 var testsContext = require.context('.', true, /_spec$/);
 testsContext.keys().forEach(testsContext);