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from test import support
support.import_module("dbm.ndbm") #skip if not supported
import unittest
import os
import random
import dbm.ndbm
from dbm.ndbm import error
class DbmTestCase(unittest.TestCase):
def setUp(self):
self.filename = support.TESTFN
self.d = dbm.ndbm.open(self.filename, 'c')
self.d.close()
def tearDown(self):
for suffix in ['', '.pag', '.dir', '.db']:
support.unlink(self.filename + suffix)
def test_keys(self):
self.d = dbm.ndbm.open(self.filename, 'c')
self.assertTrue(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')
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")
if __name__ == '__main__':
unittest.main()
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