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      1 from test import support
      2 gdbm = support.import_module("dbm.gnu") #skip if not supported
      3 import unittest
      4 import os
      5 from test.support import TESTFN, unlink
      6 
      7 
      8 filename = TESTFN
      9 
     10 class TestGdbm(unittest.TestCase):
     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         self.g[b'bytes'] = b'data'
     25         key_set = set(self.g.keys())
     26         self.assertEqual(key_set, set([b'a', b'bytes', b'12345678910']))
     27         self.assertIn('a', self.g)
     28         self.assertIn(b'a', self.g)
     29         self.assertEqual(self.g[b'bytes'], b'data')
     30         key = self.g.firstkey()
     31         while key:
     32             self.assertIn(key, key_set)
     33             key_set.remove(key)
     34             key = self.g.nextkey(key)
     35         self.assertRaises(KeyError, lambda: self.g['xxx'])
     36         # get() and setdefault() work as in the dict interface
     37         self.assertEqual(self.g.get(b'xxx', b'foo'), b'foo')
     38         self.assertEqual(self.g.setdefault(b'xxx', b'foo'), b'foo')
     39         self.assertEqual(self.g[b'xxx'], b'foo')
     40 
     41     def test_error_conditions(self):
     42         # Try to open a non-existent database.
     43         unlink(filename)
     44         self.assertRaises(gdbm.error, gdbm.open, filename, 'r')
     45         # Try to access a closed database.
     46         self.g = gdbm.open(filename, 'c')
     47         self.g.close()
     48         self.assertRaises(gdbm.error, lambda: self.g['a'])
     49         # try pass an invalid open flag
     50         self.assertRaises(gdbm.error, lambda: gdbm.open(filename, 'rx').close())
     51 
     52     def test_flags(self):
     53         # Test the flag parameter open() by trying all supported flag modes.
     54         all = set(gdbm.open_flags)
     55         # Test standard flags (presumably "crwn").
     56         modes = all - set('fsu')
     57         for mode in sorted(modes):  # put "c" mode first
     58             self.g = gdbm.open(filename, mode)
     59             self.g.close()
     60 
     61         # Test additional flags (presumably "fsu").
     62         flags = all - set('crwn')
     63         for mode in modes:
     64             for flag in flags:
     65                 self.g = gdbm.open(filename, mode + flag)
     66                 self.g.close()
     67 
     68     def test_reorganize(self):
     69         self.g = gdbm.open(filename, 'c')
     70         size0 = os.path.getsize(filename)
     71 
     72         self.g['x'] = 'x' * 10000
     73         size1 = os.path.getsize(filename)
     74         self.assertTrue(size0 < size1)
     75 
     76         del self.g['x']
     77         # 'size' is supposed to be the same even after deleting an entry.
     78         self.assertEqual(os.path.getsize(filename), size1)
     79 
     80         self.g.reorganize()
     81         size2 = os.path.getsize(filename)
     82         self.assertTrue(size1 > size2 >= size0)
     83 
     84     def test_context_manager(self):
     85         with gdbm.open(filename, 'c') as db:
     86             db["gdbm context manager"] = "context manager"
     87 
     88         with gdbm.open(filename, 'r') as db:
     89             self.assertEqual(list(db.keys()), [b"gdbm context manager"])
     90 
     91         with self.assertRaises(gdbm.error) as cm:
     92             db.keys()
     93         self.assertEqual(str(cm.exception),
     94                          "GDBM object has already been closed")
     95 
     96 if __name__ == '__main__':
     97     unittest.main()
     98