from test import support gdbm = support.import_module("dbm.gnu") #skip if not supported import unittest import os from test.support import verbose, TESTFN, unlink filename = TESTFN class TestGdbm(unittest.TestCase): def setUp(self): self.g = None def tearDown(self): if self.g is not None: self.g.close() unlink(filename) 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) self.assertRaises(KeyError, lambda: self.g['xxx']) # get() and setdefault() work as in the dict interface self.assertEqual(self.g.get(b'xxx', b'foo'), b'foo') 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) self.g['x'] = 'x' * 10000 size1 = os.path.getsize(filename) self.assertTrue(size0 < size1) 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.assertTrue(size1 > 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") if __name__ == '__main__': unittest.main()