code: def GetPossibleGroup(self):
      
  
      # Remove this method from the tail of the queue so we can add it to a group.
      this_method = self._call_queue.pop()
      assert this_method == self
  
      # Determine if the tail of the queue is a group, or just a regular ordered
      # mock method.
      group = None
      try:
        group = self._call_queue[-1]
      except IndexError:
        pass
  
      return group
docs: Returns a possible group from the end of the call queue or None if no
      other methods are on the stack.