tools/telemetry/third_party/modulegraph/modulegraph_tests/test_util.py

   1 import unittest
   2 import encodings
   3 import encodings.aliases
   4 from modulegraph import util
   5 import sys
   6
   7 try:
   8     from io import BytesIO
   9 except ImportError:
  10     from cStringIO import StringIO as BytesIO
  11
  12 class TestUtil (unittest.TestCase):
  13     def test_imp_find_module(self):
  14         fn = util.imp_find_module('encodings.aliases')[1]
  15         self.assertTrue(encodings.aliases.__file__.startswith(fn))
  16
  17     def test_imp_walk(self):
  18         imps = list(util.imp_walk('encodings.aliases'))
  19         self.assertEqual(len(imps), 2)
  20
  21         self.assertEqual(imps[0][0], 'encodings')
  22         self.assertTrue(encodings.__file__.startswith(imps[0][1][1]))
  23
  24         self.assertEqual(imps[1][0], 'aliases')
  25         self.assertTrue(encodings.aliases.__file__.startswith(imps[1][1][1]))
  26
  27         # Close all files, avoid warning by unittest
  28         for i in imps:
  29             if i[1][0] is not None:
  30                 i[1][0].close()
  31
  32
  33     def test_guess_encoding(self):
  34         fp = BytesIO(b"# coding: utf-8")
  35         self.assertEqual(util.guess_encoding(fp), "utf-8")
  36
  37         fp = BytesIO(b"\n# coding: utf-8")
  38         self.assertEqual(util.guess_encoding(fp), "utf-8")
  39
  40         fp = BytesIO(b"# coding: latin-1")
  41         self.assertEqual(util.guess_encoding(fp), "latin-1")
  42
  43         fp = BytesIO(b"\n# coding: latin-1")
  44         self.assertEqual(util.guess_encoding(fp), "latin-1")
  45
  46         fp = BytesIO(b"#!/usr/bin/env/python\n# vim: set fileencoding=latin-1 :")
  47         self.assertEqual(util.guess_encoding(fp), "latin-1")
  48
  49         fp = BytesIO(b"\n\n\n# coding: latin-1")
  50         if sys.version_info[0] == 2:
  51             self.assertEqual(util.guess_encoding(fp), "ascii")
  52         else:
  53             self.assertEqual(util.guess_encoding(fp), "utf-8")
  54
  55         del fp
  56
  57
  58 if __name__ == "__main__":
  59     unittest.main()