Lib/test/test_gdbm.py

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