Add new Jasmine test to ensure Segment.io is called when appropriate

common/static/coffee/spec/logger_spec.coffee

@@ -3,6 +3,11 @@ describe 'Logger', ->
     expect(window.log_event).toBe Logger.log
 
   describe 'log', ->
+    it 'send event to Segment.io if event is whitelisted', ->
+      spyOn 'analytics.track'
+      Logger.log 'seq_goto', 'data'
+      expect(analytics.track).toHaveBeenCalledWith 'seq_goto', 'data'
+
     it 'send a request to log event', ->
       spyOn $, 'getWithPrefix'
       Logger.log 'example', 'data'