Making originalCpm and originalCurrency fields in bid object always available

modules/currency.js

@@ -185,9 +185,6 @@ export function addBidResponseHook(fn, adUnitCode, bid) {
     return (parseFloat(this.cpm) * getCurrencyConversion(this.currency, toCurrency)).toFixed(3);
   };
 
-  bid.originalCpm = bid.cpm;
-  bid.originalCurrency = bid.currency;
-
   // execute immediately if the bid is already in the desired currency
   if (bid.currency === adServerCurrency) {
     return fn.call(this, adUnitCode, bid);

src/adapters/bidderFactory.js

@@ -301,6 +301,9 @@ export function newBidder(spec) {
           function addBidUsingRequestMap(bid) {
             const bidRequest = bidRequestMap[bid.requestId];
             if (bidRequest) {
+              // creating a copy of original values as cpm and currency are modified later
+              bid.originalCpm = bid.cpm;
+              bid.originalCurrency = bid.currency;
               const prebidBid = Object.assign(createBid(CONSTANTS.STATUS.GOOD, bidRequest), bid);
               addBidWithCode(bidRequest.adUnitCode, prebidBid);
             } else {

test/spec/unit/core/bidderFactory_spec.js

@@ -364,6 +364,10 @@ describe('bidders created by newBidder', function () {
 
       expect(addBidResponseStub.calledOnce).to.equal(true);
       expect(addBidResponseStub.firstCall.args[0]).to.equal('mock/placement');
+      let bidObject = addBidResponseStub.firstCall.args[1];
+      // checking the fields added by our code
+      expect(bidObject.originalCpm).to.equal(bid.cpm);
+      expect(bidObject.originalCurrency).to.equal(bid.currency);
       expect(doneStub.calledOnce).to.equal(true);
       expect(logErrorSpy.callCount).to.equal(0);
     });