Lib/test/test_gdbm.py

   1 import unittest
   2 import os
   3 from test.test_support import TESTFN, run_unittest, unlink, import_module
   4 gdbm = import_module('gdbm')
   5
   6
   7 filename = TESTFN
   8
   9 class TestGdbm(unittest.TestCase):
  10
  11     def setUp(self):
  12         self.g = None
  13
  14     def tearDown(self):
  15         if self.g is not None:
  16             self.g.close()
  17         unlink(filename)
  18
  19     def test_key_methods(self):
  20         self.g = gdbm.open(filename, 'c')
  21         self.assertEqual(self.g.keys(), [])
  22         self.g['a'] = 'b'
  23         self.g['12345678910'] = '019237410982340912840198242'
  24         key_set = set(self.g.keys())
  25         self.assertEqual(key_set, frozenset(['a', '12345678910']))
  26         self.assertTrue(self.g.has_key('a'))
  27         key = self.g.firstkey()
  28         while key:
  29             self.assertIn(key, key_set)
  30             key_set.remove(key)
  31             key = self.g.nextkey(key)
  32         self.assertRaises(KeyError, lambda: self.g['xxx'])
  33
  34     def test_error_conditions(self):
  35         # Try to open a non-existent database.
  36         unlink(filename)
  37         self.assertRaises(gdbm.error, gdbm.open, filename, 'r')
  38         # Try to access a closed database.
  39         self.g = gdbm.open(filename, 'c')
  40         self.g.close()
  41         self.assertRaises(gdbm.error, lambda: self.g['a'])
  42         # try pass an invalid open flag
  43         self.assertRaises(gdbm.error, lambda: gdbm.open(filename, 'rx').close())
  44
  45     def test_flags(self):
  46         # Test the flag parameter open() by trying all supported flag modes.
  47         all = set(gdbm.open_flags)
  48         # Test standard flags (presumably "crwn").
  49         modes = all - set('fsu')
  50         for mode in modes:
  51             self.g = gdbm.open(filename, mode)
  52             self.g.close()
  53
  54         # Test additional flags (presumably "fsu").
  55         flags = all - set('crwn')
  56         for mode in modes:
  57             for flag in flags:
  58                 self.g = gdbm.open(filename, mode + flag)
  59                 self.g.close()
  60
  61     def test_reorganize(self):
  62         self.g = gdbm.open(filename, 'c')
  63         size0 = os.path.getsize(filename)
  64
  65         self.g['x'] = 'x' * 10000
  66         size1 = os.path.getsize(filename)
  67         self.assertTrue(size0 < size1)
  68
  69         del self.g['x']
  70         # 'size' is supposed to be the same even after deleting an entry.
  71         self.assertEqual(os.path.getsize(filename), size1)
  72
  73         self.g.reorganize()
  74         size2 = os.path.getsize(filename)
  75         self.assertTrue(size1 > size2 >= size0)
  76
  77
  78 def test_main():
  79     run_unittest(TestGdbm)
  80
  81 if __name__ == '__main__':
  82     test_main()