new_contents: from lexos.processors.prepare.cutter import cut_by_milestone
  
  
  def test_milestone():
      file = open("/home/xliu/Lexos/test/"
                  "unit_test/test_xinru.txt", 'r')
      text_string = file.read()
      mile_stone = "is"
      assert cut_by_milestone(text_string, mile_stone) == ["Today ", " sunny."]
  
subject: add a test_cut_milestone.py file