Timestamp NYT userInfo object

lib/NYTUtils.js

@@ -43,6 +43,7 @@ exports.NYTUtils = {
         if (response.status >= 200 && response.status < 300) {
           let userInfo = response.json;
           userInfo.visitCount = this._extractVisitCount();
+          userInfo.timeStamp = Date.now();
           // we must persist userInfo to avoid a situation when dispatcher
           // is making a payload but response from NYT has not arrvied yet
           // In which case, we should use data stored previously

test/test-NYTUtils.js

@@ -56,6 +56,10 @@ exports["test fetchNYTUserData"] = function test_fetchNYTUserData(assert, done)
     server.stop(function(){});
     // add visit count to expected jason user info
     responseJSON.visitCount = 20;
+    // ensure userInfo is timestamped
+    assert.ok(userInfo.timeStamp);
+    // add it to the expected response
+    responseJSON.timeStamp = userInfo.timeStamp;
     testUtils.isIdentical(assert, userInfo, responseJSON);
   }).then(done);
 }