'''

   Tests for commands module

   Nick Mathewson

'''

import unittest

import os, tempfile, re

from test.test_support import TestSkipped, run_unittest, reap_children

from commands import *

# The module says:

#   "NB This only works (and is only relevant) for UNIX."

#

# Actually, getoutput should work on any platform with an os.popen, but

# I'll take the comment as given, and skip this suite.

if os.name != 'posix':

    raise TestSkipped('Not posix; skipping test_commands')

class CommandTests(unittest.TestCase):

    def test_getoutput(self):

        self.assertEquals(getoutput('echo xyzzy'), 'xyzzy')

        self.assertEquals(getstatusoutput('echo xyzzy'), (0, 'xyzzy'))

        # we use mkdtemp in the next line to create an empty directory

        # under our exclusive control; from that, we can invent a pathname

        # that we _know_ won't exist.  This is guaranteed to fail.

        dir = None

        try:

            dir = tempfile.mkdtemp()

            name = os.path.join(dir, "foo")

            status, output = getstatusoutput('cat ' + name)

            self.assertNotEquals(status, 0)

        finally:

            if dir is not None:

                os.rmdir(dir)

    def test_getstatus(self):

        # This pattern should match 'ls -ld /.' on any posix

        # system, however perversely configured.  Even on systems

        # (e.g., Cygwin) where user and group names can have spaces:

        #     drwxr-xr-x   15 Administ Domain U     4096 Aug 12 12:50 /

        #     drwxr-xr-x   15 Joe User My Group     4096 Aug 12 12:50 /

        # Note that the first case above has a space in the group name

        # while the second one has a space in both names.

        pat = r'''d.........   # It is a directory.

                  \+?          # It may have ACLs.

                  \s+\d+       # It has some number of links.

                  [^/]*        # Skip user, group, size, and date.

                  /\.          # and end with the name of the file.

               '''

        self.assert_(re.match(pat, getstatus("/."), re.VERBOSE))

def test_main():

    run_unittest(CommandTests)

    reap_children()

if __name__ == "__main__":

    test_main()