Lib/test/test_grp.py

   1 """Test script for the grp module."""
   2
   3 import grp
   4 import unittest
   5 from test import test_support
   6
   7 class GroupDatabaseTestCase(unittest.TestCase):
   8
   9     def check_value(self, value):
  10         # check that a grp tuple has the entries and
  11         # attributes promised by the docs
  12         self.assertEqual(len(value), 4)
  13         self.assertEqual(value[0], value.gr_name)
  14         self.assert_(isinstance(value.gr_name, basestring))
  15         self.assertEqual(value[1], value.gr_passwd)
  16         self.assert_(isinstance(value.gr_passwd, basestring))
  17         self.assertEqual(value[2], value.gr_gid)
  18         self.assert_(isinstance(value.gr_gid, int))
  19         self.assertEqual(value[3], value.gr_mem)
  20         self.assert_(isinstance(value.gr_mem, list))
  21
  22     def valueseq(self, value1, value2):
  23         # are two grp tuples equal (don't compare passwords)
  24         return value1.gr_name==value2.gr_name and \
  25             value1.gr_gid==value2.gr_gid and value1.gr_mem==value2.gr_mem
  26
  27     def test_values(self):
  28         entries = grp.getgrall()
  29         entriesbygid = {}
  30         entriesbyname = {}
  31
  32         # we can't use the same strategy as in test_pwd, because
  33         # we can't compare gr_passwd (Mac OS X returns
  34         # "*" in getgrall() and "" in getgrgid())
  35
  36         for e in entries:
  37             self.check_value(e)
  38             entriesbygid.setdefault(e.gr_gid, []).append(e)
  39             entriesbyname.setdefault(e.gr_name, []).append(e)
  40
  41         for e in entries:
  42             e2 = grp.getgrgid(e.gr_gid)
  43             self.check_value(e2)
  44             # make sure that at least one of the entries
  45             # for this gid compares equal to e2
  46             self.assert_(max([self.valueseq(e2, x) \
  47                 for x in entriesbygid[e.gr_gid]]))
  48             e2 = grp.getgrnam(e.gr_name)
  49             self.check_value(e2)
  50             # make sure that at least one of the entries
  51             # for this name compares equal to e2
  52             self.assert_(max([self.valueseq(e2, x) \
  53                 for x in entriesbyname[e.gr_name]]))
  54
  55     def test_errors(self):
  56         self.assertRaises(TypeError, grp.getgrgid)
  57         self.assertRaises(TypeError, grp.getgrnam)
  58         self.assertRaises(TypeError, grp.getgrall, 42)
  59
  60         # try to get some errors
  61         bynames = {}
  62         bygids = {}
  63         for (n, p, g, mem) in grp.getgrall():
  64             bynames[n] = g
  65             bygids[g] = n
  66
  67         allnames = bynames.keys()
  68         namei = 0
  69         fakename = allnames[namei]
  70         while fakename in bynames:
  71             chars = map(None, fakename)
  72             for i in xrange(len(chars)):
  73                 if chars[i] == 'z':
  74                     chars[i] = 'A'
  75                     break
  76                 elif chars[i] == 'Z':
  77                     continue
  78                 else:
  79                     chars[i] = chr(ord(chars[i]) + 1)
  80                     break
  81             else:
  82                 namei = namei + 1
  83                 try:
  84                     fakename = allnames[namei]
  85                 except IndexError:
  86                     # should never happen... if so, just forget it
  87                     break
  88             fakename = ''.join(map(None, chars))
  89
  90         self.assertRaises(KeyError, grp.getgrnam, fakename)
  91
  92         # Choose a non-existent gid.
  93         fakegid = 4127
  94         while fakegid in bygids:
  95             fakegid = (fakegid * 3) % 0x10000
  96
  97         self.assertRaises(KeyError, grp.getgrgid, fakegid)
  98
  99 def test_main():
 100     suite = unittest.TestSuite()
 101     suite.addTest(unittest.makeSuite(GroupDatabaseTestCase))
 102     test_support.run_suite(suite)
 103
 104 if __name__ == "__main__":
 105     test_main()