Add trafficSourceCode + test

src/adapters/appnexus.js

@@ -61,6 +61,7 @@ AppNexusAdapter = function AppNexusAdapter() {
     }
 
     jptCall = utils.tryAppendQueryString(jptCall, 'code', inventoryCode);
+    jptCall = utils.tryAppendQueryString(jptCall, 'traffic_source_code', (utils.getBidIdParameter('trafficSourceCode', bid.params)));
 
     //sizes takes a bit more logic
     var sizeQueryString = '';

test/spec/adapters/appnexus_spec.js

@@ -0,0 +1,43 @@
+import {expect} from 'chai';
+import Adapter from '../../../src/adapters/appnexus';
+import bidManager from '../../../src/bidmanager';
+import adLoader from '../../../src/adloader';
+
+describe('AppNexus Adapter', () => {
+
+  let adapter;
+
+  const REQUEST = {
+    'bidderCode': 'appnexus',
+    'requestId': 'd3e07445-ab06-44c8-a9dd-5ef9af06d2a6',
+    'bidderRequestId': '7101db09af0db2',
+    'bids': [
+      {
+        'bidder': 'appnexus',
+        'params': {
+          'placementId': '4799418',
+          'trafficSourceCode' : 'source'
+        },
+        'placementCode': '/19968336/header-bid-tag1',
+        'sizes': [
+          [728, 90],
+          [970, 90]
+        ],
+        'bidId': '84ab500420319d',
+        'bidderRequestId': '7101db09af0db2',
+        'requestId': 'd3e07445-ab06-44c8-a9dd-5ef9af06d2a6'
+      }
+    ],
+    'start': 1469479810130
+  };
+
+  sinon.stub(bidManager, 'addBidResponse');
+  const adLoaderStub = sinon.stub(adLoader, 'loadScript');
+
+  describe('callBids', () => {
+    adapter = new Adapter();
+    adapter.callBids(REQUEST);
+    expect(adLoaderStub.getCall(0).args[0]).to.contain('traffic_source_code=source');
+  });
+
+});