Sovrn Bid Adapter: add transaction id support (prebid#10156)

* EX-4755 Add: forwarding of auction id and transaction id as transaction ids for source and impression objects in the request

* EX-4755 Change: source of impression level tid for forwarding

* EX-4755 Change: source of auction level tid for forwarding

* EX-4755 Refactor: unit test description

Author: dmitrybor

modules/sovrnBidAdapter.js

@@ -169,6 +169,11 @@ export const spec = {
         };
       }
 
+      const tid = deepAccess(bidderRequest, 'ortb2.source.tid')
+      if (tid) {
+        deepSetValue(sovrnBidReq, 'source.tid', tid)
+      }
+
       if (bidderRequest.gdprConsent) {
         deepSetValue(sovrnBidReq, 'regs.ext.gdpr', +bidderRequest.gdprConsent.gdprApplies);
         deepSetValue(sovrnBidReq, 'user.ext.consent', bidderRequest.gdprConsent.consentString)

test/spec/modules/sovrnBidAdapter_spec.js

@@ -183,6 +183,40 @@ describe('sovrnBidAdapter', function() {
         expect(payload.tmax).to.equal(3000)
       })
 
+      it('forwards auction level tid', function() {
+        const bidderRequest = {
+          ...baseBidderRequest,
+          ortb2: {
+            source: {
+              tid: '1d1a030790a475'
+            }
+          },
+          bids: [baseBidRequest]
+        }
+
+        const payload = JSON.parse(spec.buildRequests([baseBidRequest], bidderRequest).data)
+        expect(payload.source?.tid).to.equal('1d1a030790a475')
+      })
+
+      it('forwards impression level tid', function() {
+        const bidRequest = {
+          ...baseBidRequest,
+          ortb2Imp: {
+            ext: {
+              tid: '1a2c032473f4983'
+            }
+          },
+        }
+
+        const bidderRequest = {
+          ...baseBidderRequest,
+          bids: [bidRequest]
+        }
+
+        const payload = JSON.parse(spec.buildRequests([bidRequest], bidderRequest).data)
+        expect(payload.imp[0]?.ext?.tid).to.equal('1a2c032473f4983')
+      })
+
       it('includes the ad unit code in the request', function() {
         const impression = payload.imp[0]
         expect(impression.adunitcode).to.equal('adunit-code')