from test import support
gdbm = support.import_module("dbm.gnu") #skip if not supported
import unittest
import os
from test.support import verbose, TESTFN, unlink
filename = TESTFN
class TestGdbm(unittest.TestCase):
def setUp(self):
self.g = None
def tearDown(self):
if self.g is not None:
self.g.close()
unlink(filename)
def test_key_methods(self):
self.g = gdbm.open(filename, 'c')
self.assertEqual(self.g.keys(), [])
self.g['a'] = 'b'
self.g['12345678910'] = '019237410982340912840198242'
self.g[b'bytes'] = b'data'
key_set = set(self.g.keys())
self.assertEqual(key_set, set([b'a', b'bytes', b'12345678910']))
self.assertIn('a', self.g)
self.assertIn(b'a', self.g)
self.assertEqual(self.g[b'bytes'], b'data')
key = self.g.firstkey()
while key:
self.assertIn(key, key_set)
key_set.remove(key)
key = self.g.nextkey(key)
self.assertRaises(KeyError, lambda: self.g['xxx'])
# get() and setdefault() work as in the dict interface
self.assertEqual(self.g.get(b'xxx', b'foo'), b'foo')
self.assertEqual(self.g.setdefault(b'xxx', b'foo'), b'foo')
self.assertEqual(self.g[b'xxx'], b'foo')
def test_error_conditions(self):
# Try to open a non-existent database.
unlink(filename)
self.assertRaises(gdbm.error, gdbm.open, filename, 'r')
# Try to access a closed database.
self.g = gdbm.open(filename, 'c')
self.g.close()
self.assertRaises(gdbm.error, lambda: self.g['a'])
# try pass an invalid open flag
self.assertRaises(gdbm.error, lambda: gdbm.open(filename, 'rx').close())
def test_flags(self):
# Test the flag parameter open() by trying all supported flag modes.
all = set(gdbm.open_flags)
# Test standard flags (presumably "crwn").
modes = all - set('fsu')
for mode in sorted(modes): # put "c" mode first
self.g = gdbm.open(filename, mode)
self.g.close()
# Test additional flags (presumably "fsu").
flags = all - set('crwn')
for mode in modes:
for flag in flags:
self.g = gdbm.open(filename, mode + flag)
self.g.close()
def test_reorganize(self):
self.g = gdbm.open(filename, 'c')
size0 = os.path.getsize(filename)
self.g['x'] = 'x' * 10000
size1 = os.path.getsize(filename)
self.assertTrue(size0 < size1)
del self.g['x']
# 'size' is supposed to be the same even after deleting an entry.
self.assertEqual(os.path.getsize(filename), size1)
self.g.reorganize()
size2 = os.path.getsize(filename)
self.assertTrue(size1 > size2 >= size0)
def test_context_manager(self):
with gdbm.open(filename, 'c') as db:
db["gdbm context manager"] = "context manager"
with gdbm.open(filename, 'r') as db:
self.assertEqual(list(db.keys()), [b"gdbm context manager"])
with self.assertRaises(gdbm.error) as cm:
db.keys()
self.assertEqual(str(cm.exception),
"GDBM object has already been closed")
if __name__ == '__main__':
unittest.main()