Take the spy off the eventBus after trigger

Author: robertbryer

test/unit/test/streaming/streaming.controllers.StreamController.js

@@ -211,6 +211,7 @@ describe('StreamController', function () {
                 eventBus.on(Events.STREAM_TEARDOWN_COMPLETE, spy);
 
                 eventBus.trigger(Events.MANIFEST_UPDATED, { error: {} });
+                eventBus.off(Events.STREAM_TEARDOWN_COMPLETE, spy);
                 expect(spy).to.have.been.called.exactly(1);
             });
         });