fix javascript spec

Author: chloerei

spec/javascripts/topics_spec.coffee

@@ -103,7 +103,7 @@ describe "Topics", ->
         """
 
       it 'replies to floor 1 and login 012345', ->
-        spy = @spy(Topics, 'reply')
+        spy = sinon.spy(Topics, 'reply')
         Topics.init()
         @htmlContainer.find('a').click()
         console.log spy.args