1from test import support
2support.import_module("dbm.ndbm") #skip if not supported
3import unittest
4import dbm.ndbm
5from dbm.ndbm import error
6
7class DbmTestCase(unittest.TestCase):
8
9    def setUp(self):
10        self.filename = support.TESTFN
11        self.d = dbm.ndbm.open(self.filename, 'c')
12        self.d.close()
13
14    def tearDown(self):
15        for suffix in ['', '.pag', '.dir', '.db']:
16            support.unlink(self.filename + suffix)
17
18    def test_keys(self):
19        self.d = dbm.ndbm.open(self.filename, 'c')
20        self.assertTrue(self.d.keys() == [])
21        self.d['a'] = 'b'
22        self.d[b'bytes'] = b'data'
23        self.d['12345678910'] = '019237410982340912840198242'
24        self.d.keys()
25        self.assertIn('a', self.d)
26        self.assertIn(b'a', self.d)
27        self.assertEqual(self.d[b'bytes'], b'data')
28        self.d.close()
29
30    def test_modes(self):
31        for mode in ['r', 'rw', 'w', 'n']:
32            try:
33                self.d = dbm.ndbm.open(self.filename, mode)
34                self.d.close()
35            except error:
36                self.fail()
37
38    def test_context_manager(self):
39        with dbm.ndbm.open(self.filename, 'c') as db:
40            db["ndbm context manager"] = "context manager"
41
42        with dbm.ndbm.open(self.filename, 'r') as db:
43            self.assertEqual(list(db.keys()), [b"ndbm context manager"])
44
45        with self.assertRaises(dbm.ndbm.error) as cm:
46            db.keys()
47        self.assertEqual(str(cm.exception),
48                         "DBM object has already been closed")
49
50
51if __name__ == '__main__':
52    unittest.main()
53