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()