Set the OpenRTB device dimensions (prebid#3336)

* Set the device dimensions if the config didnt do it.

* add unit tests

* Added a regresstion test to catch the bug. The code should still populate w and h even if the config doesnt have that object.

modules/prebidServerBidAdapter/index.js

@@ -196,6 +196,15 @@ function _appendSiteAppDevice(request) {
   if (typeof config.getConfig('device') === 'object') {
     request.device = config.getConfig('device');
   }
+  if (!request.device) {
+    request.device = {};
+  }
+  if (!request.device.w) {
+    request.device.w = window.innerWidth;
+  }
+  if (!request.device.h) {
+    request.device.h = window.innerHeight;
+  }
 }
 
 function transformHeightWidth(adUnit) {

test/spec/modules/prebidServerBidAdapter_spec.js

@@ -558,6 +558,8 @@ describe('S2S Adapter', function () {
       const requestBid = JSON.parse(requests[0].requestBody);
       expect(requestBid.device).to.deep.equal({
         ifa: '6D92078A-8246-4BA4-AE5B-76104861E7DC',
+        w: window.innerWidth,
+        h: window.innerHeight
       });
       expect(requestBid.app).to.deep.equal({
         bundle: 'com.test.app',
@@ -581,6 +583,31 @@ describe('S2S Adapter', function () {
       const requestBid = JSON.parse(requests[0].requestBody);
       expect(requestBid.device).to.deep.equal({
         ifa: '6D92078A-8246-4BA4-AE5B-76104861E7DC',
+        w: window.innerWidth,
+        h: window.innerHeight
+      });
+      expect(requestBid.app).to.deep.equal({
+        bundle: 'com.test.app',
+        publisher: {'id': '1'}
+      });
+    });
+
+    it('adds device.w and device.h even if the config lacks a device object', function () {
+      const s2sConfig = Object.assign({}, CONFIG, {
+        endpoint: 'https://prebid.adnxs.com/pbs/v1/openrtb2/auction'
+      });
+
+      const _config = {
+        s2sConfig: s2sConfig,
+        app: { bundle: 'com.test.app' },
+      };
+
+      config.setConfig(_config);
+      adapter.callBids(REQUEST, BID_REQUESTS, addBidResponse, done, ajax);
+      const requestBid = JSON.parse(requests[0].requestBody);
+      expect(requestBid.device).to.deep.equal({
+        w: window.innerWidth,
+        h: window.innerHeight
       });
       expect(requestBid.app).to.deep.equal({
         bundle: 'com.test.app',