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from test.support import import_helper
from test.support import os_helper
import_helper.import_module("dbm.ndbm") #skip if not supported
import os
import unittest
import dbm.ndbm
from dbm.ndbm import error
class DbmTestCase(unittest.TestCase):
def setUp(self):
self.filename = os_helper.TESTFN
self.d = dbm.ndbm.open(self.filename, 'c')
self.d.close()
def tearDown(self):
for suffix in ['', '.pag', '.dir', '.db']:
os_helper.unlink(self.filename + suffix)
def test_keys(self):
self.d = dbm.ndbm.open(self.filename, 'c')
self.assertEqual(self.d.keys(), [])
self.d['a'] = 'b'
self.d[b'bytes'] = b'data'
self.d['12345678910'] = '019237410982340912840198242'
self.d.keys()
self.assertIn('a', self.d)
self.assertIn(b'a', self.d)
self.assertEqual(self.d[b'bytes'], b'data')
# get() and setdefault() work as in the dict interface
self.assertEqual(self.d.get(b'a'), b'b')
self.assertIsNone(self.d.get(b'xxx'))
self.assertEqual(self.d.get(b'xxx', b'foo'), b'foo')
with self.assertRaises(KeyError):
self.d['xxx']
self.assertEqual(self.d.setdefault(b'xxx', b'foo'), b'foo')
self.assertEqual(self.d[b'xxx'], b'foo')
self.d.close()
def test_empty_value(self):
if dbm.ndbm.library == 'Berkeley DB':
self.skipTest("Berkeley DB doesn't distinguish the empty value "
"from the absent one")
self.d = dbm.ndbm.open(self.filename, 'c')
self.assertEqual(self.d.keys(), [])
self.d['empty'] = ''
self.assertEqual(self.d.keys(), [b'empty'])
self.assertIn(b'empty', self.d)
self.assertEqual(self.d[b'empty'], b'')
self.assertEqual(self.d.get(b'empty'), b'')
self.assertEqual(self.d.setdefault(b'empty'), b'')
self.d.close()
def test_modes(self):
for mode in ['r', 'rw', 'w', 'n']:
try:
self.d = dbm.ndbm.open(self.filename, mode)
self.d.close()
except error:
self.fail()
def test_context_manager(self):
with dbm.ndbm.open(self.filename, 'c') as db:
db["ndbm context manager"] = "context manager"
with dbm.ndbm.open(self.filename, 'r') as db:
self.assertEqual(list(db.keys()), [b"ndbm context manager"])
with self.assertRaises(dbm.ndbm.error) as cm:
db.keys()
self.assertEqual(str(cm.exception),
"DBM object has already been closed")
def test_bytes(self):
with dbm.ndbm.open(self.filename, 'c') as db:
db[b'bytes key \xbd'] = b'bytes value \xbd'
with dbm.ndbm.open(self.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 dbm.ndbm.open(self.filename, 'c') as db:
db['Unicode key \U0001f40d'] = 'Unicode value \U0001f40d'
with dbm.ndbm.open(self.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 dbm.ndbm.open(self.filename, 'c') as db:
db[b'bytes key'] = b'bytes value'
with dbm.ndbm.open(self.filename, 'r') as db:
with self.assertRaises(error):
del db[b'not exist key']
with self.assertRaises(error):
del db[b'bytes key']
with self.assertRaises(error):
db[b'not exist key'] = b'not exist value'
@unittest.skipUnless(os_helper.TESTFN_NONASCII,
'requires OS support of non-ASCII encodings')
def test_nonascii_filename(self):
filename = os_helper.TESTFN_NONASCII
for suffix in ['', '.pag', '.dir', '.db']:
self.addCleanup(os_helper.unlink, filename + suffix)
with dbm.ndbm.open(filename, 'c') as db:
db[b'key'] = b'value'
self.assertTrue(any(os.path.exists(filename + suffix)
for suffix in ['', '.pag', '.dir', '.db']))
with dbm.ndbm.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(dbm.ndbm.error) as cm:
dbm.ndbm.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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