code: def testHeaders(self):
      for fname in [
          os.path.join("MPI.h"),
          os.path.join("MPI_api.h"),
          os.path.join("include", "mpi4py", "mpi4py.h"),
          os.path.join("include", "mpi4py", "mpi4py.i"),
      ]:
          hdr = os.path.join(pkgdir, fname)
          self.assertTrue(os.path.exists(hdr))
  
file_path: mpi4py/test/test_package.py
imports: import mpi4py
  import unittest
  import sys, os
label_desc: Use image node_id 3 for calling the TestDataFiles obj's underlying member method code with example usage: obj.testHeaders() without return types