code: def test_stopwatch_long_str():
      w = lku.Stopwatch()
      time.sleep(1.2)
      s = str(w)
      assert s.endswith("s")
  
file_path: lkpy/tests/test_util.py
imports: import time
  import re
  import pathlib
  import numpy
  import pandas
  from lenskit import util
label_desc: Use image node_id 5 for calling a global function with example usage: test_stopwatch_long_str() without return types