code: def test_cycache_switch(self):
      content1 = "value = 1\n"
      content2 = "value = 2\n"
      a_pyx = os.path.join(self.src_dir, "a.pyx")
      a_c = a_pyx[:-4] + ".c"
  
      open(a_pyx, "w").write(content1)
      self.fresh_cythonize(a_pyx, cache=self.cache_dir)
      self.fresh_cythonize(a_pyx, cache=self.cache_dir)
      self.assertEqual(1, len(self.cache_files("a.c*")))
      a_contents1 = open(a_c).read()
      os.unlink(a_c)
  
      open(a_pyx, "w").write(content2)
      self.fresh_cythonize(a_pyx, cache=self.cache_dir)
      a_contents2 = open(a_c).read()
      os.unlink(a_c)
  
      self.assertNotEqual(
          a_contents1, a_contents2, "C file not changed!"
      )
      self.assertEqual(2, len(self.cache_files("a.c*")))
  
      open(a_pyx, "w").write(content1)
      self.fresh_cythonize(a_pyx, cache=self.cache_dir)
      self.assertEqual(2, len(self.cache_files("a.c*")))
      a_contents = open(a_c).read()
      self.assertEqual(
          a_contents,
          a_contents1,
          msg="\n".join(
              list(
                  difflib.unified_diff(
                      a_contents.split("\n"), a_contents1.split("\n")
                  )
              )[:10]
          ),
      )
  
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 4 for calling the TestCyCache obj's underlying member method code with example usage: obj.test_cycache_switch() without return types