code: def test_cycache_uses_cache(self):
      a_pyx = os.path.join(self.src_dir, "a.pyx")
      a_c = a_pyx[:-4] + ".c"
      open(a_pyx, "w").write("pass")
      self.fresh_cythonize(a_pyx, cache=self.cache_dir)
      a_cache = os.path.join(
          self.cache_dir, os.listdir(self.cache_dir)[0]
      )
      gzip.GzipFile(a_cache, "wb").write("fake stuff".encode("ascii"))
      os.unlink(a_c)
      self.fresh_cythonize(a_pyx, cache=self.cache_dir)
      a_contents = open(a_c).read()
      self.assertEqual(
          a_contents,
          "fake stuff",
          "Unexpected contents: %s..." % a_contents[:100],
      )
  
file_path: catboost/contrib/tools/cython/Cython/Build/Tests/TestCyCache.py
imports: import difflib
  import glob
  import gzip
  import os
  import tempfile
  import Cython.Build.Dependencies
  import Cython.Utils
  from Cython.TestUtils import CythonTest
label_desc: Use image node_id 5 for calling the TestCyCache obj's underlying member method code with example usage: obj.test_cycache_uses_cache() without return types