text: 
  import time
  
  
  _mock_time = None
  
  
  def get_now():
      if _mock_time == None:
          return time.time()
      else:
          return _mock_time
  
  
  def _set_mock_time(mock_time):
      global _mock_time
      _mock_time = mock_time
  
  
  def _fast_forward(seconds):
      global _mock_time
      _mock_time += seconds
  