Lib/test/test_commands.py

   1 '''
   2    Tests for commands module
   3    Nick Mathewson
   4 '''
   5 import unittest
   6 import os, tempfile, re
   7
   8 from test.test_support import run_unittest, reap_children, import_module, \
   9                               check_warnings
  10
  11 # Silence Py3k warning
  12 commands = import_module('commands', deprecated=True)
  13
  14 # The module says:
  15 #   "NB This only works (and is only relevant) for UNIX."
  16 #
  17 # Actually, getoutput should work on any platform with an os.popen, but
  18 # I'll take the comment as given, and skip this suite.
  19
  20 if os.name != 'posix':
  21     raise unittest.SkipTest('Not posix; skipping test_commands')
  22
  23
  24 class CommandTests(unittest.TestCase):
  25
  26     def test_getoutput(self):
  27         self.assertEquals(commands.getoutput('echo xyzzy'), 'xyzzy')
  28         self.assertEquals(commands.getstatusoutput('echo xyzzy'), (0, 'xyzzy'))
  29
  30         # we use mkdtemp in the next line to create an empty directory
  31         # under our exclusive control; from that, we can invent a pathname
  32         # that we _know_ won't exist.  This is guaranteed to fail.
  33         dir = None
  34         try:
  35             dir = tempfile.mkdtemp()
  36             name = os.path.join(dir, "foo")
  37
  38             status, output = commands.getstatusoutput('cat ' + name)
  39             self.assertNotEquals(status, 0)
  40         finally:
  41             if dir is not None:
  42                 os.rmdir(dir)
  43
  44     def test_getstatus(self):
  45         # This pattern should match 'ls -ld /.' on any posix
  46         # system, however perversely configured.  Even on systems
  47         # (e.g., Cygwin) where user and group names can have spaces:
  48         #     drwxr-xr-x   15 Administ Domain U     4096 Aug 12 12:50 /
  49         #     drwxr-xr-x   15 Joe User My Group     4096 Aug 12 12:50 /
  50         # Note that the first case above has a space in the group name
  51         # while the second one has a space in both names.
  52         pat = r'''d.........   # It is a directory.
  53                   \+?          # It may have ACLs.
  54                   \s+\d+       # It has some number of links.
  55                   [^/]*        # Skip user, group, size, and date.
  56                   /\.          # and end with the name of the file.
  57                '''
  58
  59         with check_warnings((".*commands.getstatus.. is deprecated",
  60                              DeprecationWarning)):
  61             self.assertTrue(re.match(pat, commands.getstatus("/."), re.VERBOSE))
  62
  63
  64 def test_main():
  65     run_unittest(CommandTests)
  66     reap_children()
  67
  68
  69 if __name__ == "__main__":
  70     test_main()