from test import support from test.support import import_helper, cpython_only gdbm = import_helper.import_module("dbm.gnu") #skip if not supported import unittest import os from test.support.os_helper import TESTFN, TESTFN_NONASCII, unlink filename = TESTFN class TestGdbm(unittest.TestCase): @staticmethod def setUpClass(): if support.verbose: try: from _gdbm import _GDBM_VERSION as version except ImportError: pass else: print(f"gdbm version: {version}") def setUp(self): self.g = None def tearDown(self): if self.g is not None: self.g.close() unlink(filename) @cpython_only def test_disallow_instantiation(self): # Ensure that the type disallows instantiation (bpo-43916) self.g = gdbm.open(filename, 'c') support.check_disallow_instantiation(self, type(self.g)) 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) # get() and setdefault() work as in the dict interface self.assertEqual(self.g.get(b'a'), b'b') self.assertIsNone(self.g.get(b'xxx')) self.assertEqual(self.g.get(b'xxx', b'foo'), b'foo') with self.assertRaises(KeyError): self.g['xxx'] 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) # bpo-33901: on macOS with gdbm 1.15, an empty database uses 16 MiB # and adding an entry of 10,000 B has no effect on the file size. # Add size0 bytes to make sure that the file size changes. value_size = max(size0, 10000) self.g['x'] = 'x' * value_size size1 = os.path.getsize(filename) self.assertGreater(size1, size0) 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.assertLess(size2, size1) self.assertGreaterEqual(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") def test_bytes(self): with gdbm.open(filename, 'c') as db: db[b'bytes key \xbd'] = b'bytes value \xbd' with gdbm.open(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 gdbm.open(filename, 'c') as db: db['Unicode key \U0001f40d'] = 'Unicode value \U0001f40d' with gdbm.open(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 gdbm.open(filename, 'c') as db: db[b'bytes key'] = b'bytes value' with gdbm.open(filename, 'r') as db: with self.assertRaises(gdbm.error): del db[b'not exist key'] with self.assertRaises(gdbm.error): del db[b'bytes key'] with self.assertRaises(gdbm.error): db[b'not exist key'] = b'not exist value' @unittest.skipUnless(TESTFN_NONASCII, 'requires OS support of non-ASCII encodings') def test_nonascii_filename(self): filename = TESTFN_NONASCII self.addCleanup(unlink, filename) with gdbm.open(filename, 'c') as db: db[b'key'] = b'value' self.assertTrue(os.path.exists(filename)) with gdbm.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(gdbm.error) as cm: gdbm.open(nonexisting_file) self.assertIn(nonexisting_file, str(cm.exception)) self.assertEqual(cm.exception.filename, nonexisting_file) if __name__ == '__main__': unittest.main()