Add meta.advertiserDomains for Prebid 5.0 (prebid#6978)

Author: mirkorean

modules/yieldlabBidAdapter.js

@@ -114,7 +114,10 @@ export const spec = {
           netRevenue: false,
           ttl: BID_RESPONSE_TTL_SEC,
           referrer: '',
-          ad: `<script src="${ENDPOINT}/d/${matchedBid.id}/${bidRequest.params.supplyId}/?ts=${timestamp}${extId}${gdprApplies}${gdprConsent}"></script>`
+          ad: `<script src="${ENDPOINT}/d/${matchedBid.id}/${bidRequest.params.supplyId}/?ts=${timestamp}${extId}${gdprApplies}${gdprConsent}"></script>`,
+          meta: {
+            advertiserDomains: (matchedBid.advertiser) ? matchedBid.advertiser : 'n/a'
+          }
         }
 
         if (isVideo(bidRequest, adType)) {

test/spec/modules/yieldlabBidAdapter_spec.js

@@ -179,6 +179,7 @@ describe('yieldlabBidAdapter', function () {
       expect(result[0].netRevenue).to.equal(false)
       expect(result[0].ttl).to.equal(300)
       expect(result[0].referrer).to.equal('')
+      expect(result[0].meta.advertiserDomains).to.equal('yieldlab')
       expect(result[0].ad).to.include('<script src="https://ad.yieldlab.net/d/1111/2222/?ts=')
       expect(result[0].ad).to.include('&id=abc')
     })
@@ -210,6 +211,7 @@ describe('yieldlabBidAdapter', function () {
       expect(result[0].netRevenue).to.equal(false)
       expect(result[0].ttl).to.equal(300)
       expect(result[0].referrer).to.equal('')
+      expect(result[0].meta.advertiserDomains).to.equal('yieldlab')
       expect(result[0].ad).to.include('<script src="https://ad.yieldlab.net/d/1111/2222/?ts=')
       expect(result[0].ad).to.include('&id=abc')
     })