code: def testCython(self):
      for fname in [
          "__init__.pxd",
          "libmpi.pxd",
          "MPI.pxd",
      ]:
          pxd = os.path.join(pkgdir, fname)
          self.assertTrue(os.path.exists(pxd))
  
file_path: mpi4py/test/test_package.py
imports: import mpi4py
  import unittest
  import sys, os
label_desc: Use image node_id 2 for calling the TestDataFiles obj's underlying member method code with example usage: obj.testCython() without return types