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from test import support
from test.support import import_helper, cpython_only
gdbm = import_helper.import_module("dbm.gnu") #skip if not supported
import unittest
import os
from test.support.os_helper import TESTFN, TESTFN_NONASCII, unlink
filename = TESTFN
class TestGdbm(unittest.TestCase):
@staticmethod
def setUpClass():
if support.verbose:
try:
from _gdbm import _GDBM_VERSION as version
except ImportError:
pass
else:
print(f"gdbm version: {version}")
def setUp(self):
self.g = None
def tearDown(self):
if self.g is not None:
self.g.close()
unlink(filename)
@cpython_only
def test_disallow_instantiation(self):
# Ensure that the type disallows instantiation (bpo-43916)
self.g = gdbm.open(filename, 'c')
support.check_disallow_instantiation(self, type(self.g))
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)
# get() and setdefault() work as in the dict interface
self.assertEqual(self.g.get(b'a'), b'b')
self.assertIsNone(self.g.get(b'xxx'))
self.assertEqual(self.g.get(b'xxx', b'foo'), b'foo')
with self.assertRaises(KeyError):
self.g['xxx']
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)
# bpo-33901: on macOS with gdbm 1.15, an empty database uses 16 MiB
# and adding an entry of 10,000 B has no effect on the file size.
# Add size0 bytes to make sure that the file size changes.
value_size = max(size0, 10000)
self.g['x'] = 'x' * value_size
size1 = os.path.getsize(filename)
self.assertGreater(size1, size0)
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.assertLess(size2, size1)
self.assertGreaterEqual(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")
def test_bytes(self):
with gdbm.open(filename, 'c') as db:
db[b'bytes key \xbd'] = b'bytes value \xbd'
with gdbm.open(filename, 'r') as db:
self.assertEqual(list(db.keys()), [b'bytes key \xbd'])
self.assertTrue(b'bytes key \xbd' in db)
self.assertEqual(db[b'bytes key \xbd'], b'bytes value \xbd')
def test_unicode(self):
with gdbm.open(filename, 'c') as db:
db['Unicode key \U0001f40d'] = 'Unicode value \U0001f40d'
with gdbm.open(filename, 'r') as db:
self.assertEqual(list(db.keys()), ['Unicode key \U0001f40d'.encode()])
self.assertTrue('Unicode key \U0001f40d'.encode() in db)
self.assertTrue('Unicode key \U0001f40d' in db)
self.assertEqual(db['Unicode key \U0001f40d'.encode()],
'Unicode value \U0001f40d'.encode())
self.assertEqual(db['Unicode key \U0001f40d'],
'Unicode value \U0001f40d'.encode())
def test_write_readonly_file(self):
with gdbm.open(filename, 'c') as db:
db[b'bytes key'] = b'bytes value'
with gdbm.open(filename, 'r') as db:
with self.assertRaises(gdbm.error):
del db[b'not exist key']
with self.assertRaises(gdbm.error):
del db[b'bytes key']
with self.assertRaises(gdbm.error):
db[b'not exist key'] = b'not exist value'
@unittest.skipUnless(TESTFN_NONASCII,
'requires OS support of non-ASCII encodings')
def test_nonascii_filename(self):
filename = TESTFN_NONASCII
self.addCleanup(unlink, filename)
with gdbm.open(filename, 'c') as db:
db[b'key'] = b'value'
self.assertTrue(os.path.exists(filename))
with gdbm.open(filename, 'r') as db:
self.assertEqual(list(db.keys()), [b'key'])
self.assertTrue(b'key' in db)
self.assertEqual(db[b'key'], b'value')
def test_nonexisting_file(self):
nonexisting_file = 'nonexisting-file'
with self.assertRaises(gdbm.error) as cm:
gdbm.open(nonexisting_file)
self.assertIn(nonexisting_file, str(cm.exception))
self.assertEqual(cm.exception.filename, nonexisting_file)
if __name__ == '__main__':
unittest.main()
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