def METHOD_NAME(self):
    ob = self.model.net.AddObserver("TimeObserver")
    ws.RunNet(self.model.net)
    print(ob.average_time())
    num = self.model.net.NumObservers()
    self.model.net.RemoveObserver(ob)
    assert(self.model.net.NumObservers() + 1 == num)