class_docstr: Enable automatic doctest integration to unittest.
  
  Every module in the pythran package is scanned for doctests
  and one test per module is created
code: def test_tutorial(self):
      failed, _ = doctest.testfile("../../docs/TUTORIAL.rst")
      self.assertEqual(failed, 0)
  
file_path: pythran/pythran/tests/test_xdoc.py
imports: import doctest
  import inspect
  import os
  import pytest
  import sys
  import unittest
  import pythran
  from pythran import transformations, analyses, optimizations, types, log
label_desc: Use image node_id 1 for calling the TestDoctest obj's underlying member method code with example usage: obj.test_tutorial() without return types