diff --git a/test/spec/modules/consentManagement_spec.js b/test/spec/modules/consentManagement_spec.js
index 18df72f044d..eb1614e4965 100644
--- a/test/spec/modules/consentManagement_spec.js
+++ b/test/spec/modules/consentManagement_spec.js
@@ -201,95 +201,60 @@ describe('consentManagement', function () {
 
     describe('CMP workflow for iframed page', () => {
       let eventStub = sinon.stub();
-      let postMessageStub = sinon.stub();
-      let ifr = null;
+      let cmpStub = sinon.stub();
 
       beforeEach(() => {
         didHookReturn = false;
+        window.__cmp = function() {};
         sinon.stub(utils, 'logError');
         sinon.stub(utils, 'logWarn');
-        ifr = createIFrameMarker();
       });
 
       afterEach(() => {
         config.resetConfig();
         $$PREBID_GLOBAL$$.requestBids.removeHook(requestBidsHook);
         eventStub.restore();
-        postMessageStub.restore();
+        cmpStub.restore();
         delete window.__cmp;
         utils.logError.restore();
         utils.logWarn.restore();
         resetConsentData();
-        document.body.removeChild(ifr);
       });
 
-      function createIFrameMarker() {
-        var ifr = document.createElement('iframe');
-        ifr.width = 0;
-        ifr.height = 0;
-        ifr.name = '__cmpLocator';
-        document.body.appendChild(ifr);
-        return ifr;
-      }
-
-      testIFramedPage('with/JSON response', {
-        data: {
-          __cmpReturn: {
-            returnValue: {
-              gdprApplies: true,
-              metadata: 'BOJy+UqOJy+UqABAB+AAAAAZ+A=='
-            }
-          }
-        }
-      }, false);
-
-      testIFramedPage('with/String response', {
-        data: {
-          __cmpReturn: {
-            returnValue: {
-              gdprApplies: true,
-              metadata: 'BOJy+UqOJy+UqABAB+AAAAAZ+A=='
+      it('should return the consent string from a postmessage + addEventListener response', () => {
+        let testConsentData = {
+          data: {
+            __cmpReturn: {
+              returnValue: {
+                gdprApplies: true,
+                metadata: 'BOJy+UqOJy+UqABAB+AAAAAZ+A=='
+              }
             }
           }
-        }
-      }, true);
-
-      function testIFramedPage(testName, testConsentData, messageFormatString) {
-        it(`should return the consent string from a postmessage + addEventListener response - ${testName}`, () => {
-          let messageListener;
-          eventStub = sinon.stub(window, 'addEventListener').callsFake((...args) => {
-            // save reference to event listener for message
-            // so we can return the data when the message arrives via 'postMessage'
-            messageListener = args[1];
-          });
-          // when the iframed window sends a message to the window
-          // containing the CMP, intercept it and respond back with data
-          // on the message listener.
-          postMessageStub = sinon.stub(window, 'postMessage').callsFake((...args) => {
-            if (messageListener && args[0] && args[0].__cmpCall) {
-              // take the callId from request and stamp it on the response.
-              testConsentData.data.__cmpReturn.callId = args[0].__cmpCall.callId;
-              // serialize the data part to String if requested
-              messageListener(messageFormatString ? {
-                data: JSON.stringify(testConsentData.data)
-              } : testConsentData);
-            }
+        };
+        eventStub = sinon.stub(window, 'addEventListener').callsFake((...args) => {
+          args[1](testConsentData);
+        });
+        cmpStub = sinon.stub(window, '__cmp').callsFake((...args) => {
+          args[2]({
+            gdprApplies: true,
+            metadata: 'BOJy+UqOJy+UqABAB+AAAAAZ+A=='
           });
+        });
 
-          setConfig(goodConfigWithAllowAuction);
-
-          requestBidsHook({}, () => {
-            didHookReturn = true;
-          });
-          let consent = gdprDataHandler.getConsentData();
+        setConfig(goodConfigWithAllowAuction);
 
-          sinon.assert.notCalled(utils.logWarn);
-          sinon.assert.notCalled(utils.logError);
-          expect(didHookReturn).to.be.true;
-          expect(consent.consentString).to.equal('BOJy+UqOJy+UqABAB+AAAAAZ+A==');
-          expect(consent.gdprApplies).to.be.true;
+        requestBidsHook({}, () => {
+          didHookReturn = true;
         });
-      }
+        let consent = gdprDataHandler.getConsentData();
+
+        sinon.assert.notCalled(utils.logWarn);
+        sinon.assert.notCalled(utils.logError);
+        expect(didHookReturn).to.be.true;
+        expect(consent.consentString).to.equal('BOJy+UqOJy+UqABAB+AAAAAZ+A==');
+        expect(consent.gdprApplies).to.be.true;
+      });
     });
 
     describe('CMP workflow for normal pages:', () => {