code: def test_novalue():
      import numpy as np
  
      for proto in range(2, pickle.HIGHEST_PROTOCOL + 1):
          assert_equal(repr(np._NoValue), "<no value>")
          assert_(
              pickle.loads(pickle.dumps(np._NoValue, protocol=proto))
              is np._NoValue
          )
  
file_path: catboost/contrib/python/numpy/py3/numpy/tests/test_reloading.py
imports: from numpy.testing import assert_raises, assert_warns, assert_, assert_equal, IS_WASM
  from numpy.compat import pickle
  import pytest
  import sys
  import subprocess
  import textwrap
  from importlib import reload
label_desc: Use image node_id 2 for calling a global function with example usage: test_novalue() without return types