213 lines
6.4 KiB
Python
213 lines
6.4 KiB
Python
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"""Test script for the dbm.open function based on testdumbdbm.py"""
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import unittest
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import glob
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import test.support
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# Skip tests if dbm module doesn't exist.
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dbm = test.support.import_module('dbm')
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try:
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from dbm import ndbm
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except ImportError:
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ndbm = None
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_fname = test.support.TESTFN
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#
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# Iterates over every database module supported by dbm currently available,
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# setting dbm to use each in turn, and yielding that module
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#
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def dbm_iterator():
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for name in dbm._names:
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try:
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mod = __import__(name, fromlist=['open'])
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except ImportError:
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continue
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dbm._modules[name] = mod
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yield mod
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#
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# Clean up all scratch databases we might have created during testing
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#
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def delete_files():
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# we don't know the precise name the underlying database uses
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# so we use glob to locate all names
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for f in glob.glob(glob.escape(_fname) + "*"):
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test.support.unlink(f)
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class AnyDBMTestCase:
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_dict = {'a': b'Python:',
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'b': b'Programming',
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'c': b'the',
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'd': b'way',
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'f': b'Guido',
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'g': b'intended',
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}
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def init_db(self):
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f = dbm.open(_fname, 'n')
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for k in self._dict:
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f[k.encode("ascii")] = self._dict[k]
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f.close()
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def keys_helper(self, f):
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keys = sorted(k.decode("ascii") for k in f.keys())
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dkeys = sorted(self._dict.keys())
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self.assertEqual(keys, dkeys)
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return keys
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def test_error(self):
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self.assertTrue(issubclass(self.module.error, OSError))
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def test_anydbm_not_existing(self):
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self.assertRaises(dbm.error, dbm.open, _fname)
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def test_anydbm_creation(self):
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f = dbm.open(_fname, 'c')
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self.assertEqual(list(f.keys()), [])
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for key in self._dict:
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f[key.encode("ascii")] = self._dict[key]
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self.read_helper(f)
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f.close()
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def test_anydbm_creation_n_file_exists_with_invalid_contents(self):
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# create an empty file
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test.support.create_empty_file(_fname)
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with dbm.open(_fname, 'n') as f:
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self.assertEqual(len(f), 0)
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def test_anydbm_modification(self):
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self.init_db()
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f = dbm.open(_fname, 'c')
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self._dict['g'] = f[b'g'] = b"indented"
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self.read_helper(f)
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# setdefault() works as in the dict interface
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self.assertEqual(f.setdefault(b'xxx', b'foo'), b'foo')
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self.assertEqual(f[b'xxx'], b'foo')
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f.close()
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def test_anydbm_read(self):
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self.init_db()
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f = dbm.open(_fname, 'r')
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self.read_helper(f)
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# get() works as in the dict interface
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self.assertEqual(f.get(b'a'), self._dict['a'])
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self.assertEqual(f.get(b'xxx', b'foo'), b'foo')
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self.assertIsNone(f.get(b'xxx'))
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with self.assertRaises(KeyError):
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f[b'xxx']
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f.close()
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def test_anydbm_keys(self):
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self.init_db()
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f = dbm.open(_fname, 'r')
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keys = self.keys_helper(f)
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f.close()
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def test_empty_value(self):
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if getattr(dbm._defaultmod, 'library', None) == 'Berkeley DB':
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self.skipTest("Berkeley DB doesn't distinguish the empty value "
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"from the absent one")
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f = dbm.open(_fname, 'c')
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self.assertEqual(f.keys(), [])
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f[b'empty'] = b''
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self.assertEqual(f.keys(), [b'empty'])
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self.assertIn(b'empty', f)
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self.assertEqual(f[b'empty'], b'')
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self.assertEqual(f.get(b'empty'), b'')
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self.assertEqual(f.setdefault(b'empty'), b'')
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f.close()
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def test_anydbm_access(self):
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self.init_db()
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f = dbm.open(_fname, 'r')
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key = "a".encode("ascii")
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self.assertIn(key, f)
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assert(f[key] == b"Python:")
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f.close()
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def read_helper(self, f):
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keys = self.keys_helper(f)
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for key in self._dict:
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self.assertEqual(self._dict[key], f[key.encode("ascii")])
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def tearDown(self):
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delete_files()
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def setUp(self):
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dbm._defaultmod = self.module
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delete_files()
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class WhichDBTestCase(unittest.TestCase):
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def test_whichdb(self):
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for module in dbm_iterator():
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# Check whether whichdb correctly guesses module name
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# for databases opened with "module" module.
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# Try with empty files first
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name = module.__name__
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if name == 'dbm.dumb':
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continue # whichdb can't support dbm.dumb
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delete_files()
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f = module.open(_fname, 'c')
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f.close()
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self.assertEqual(name, self.dbm.whichdb(_fname))
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# Now add a key
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f = module.open(_fname, 'w')
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f[b"1"] = b"1"
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# and test that we can find it
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self.assertIn(b"1", f)
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# and read it
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self.assertEqual(f[b"1"], b"1")
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f.close()
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self.assertEqual(name, self.dbm.whichdb(_fname))
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@unittest.skipUnless(ndbm, reason='Test requires ndbm')
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def test_whichdb_ndbm(self):
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# Issue 17198: check that ndbm which is referenced in whichdb is defined
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db_file = '{}_ndbm.db'.format(_fname)
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with open(db_file, 'w'):
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self.addCleanup(test.support.unlink, db_file)
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self.assertIsNone(self.dbm.whichdb(db_file[:-3]))
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def tearDown(self):
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delete_files()
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def setUp(self):
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delete_files()
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self.filename = test.support.TESTFN
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self.d = dbm.open(self.filename, 'c')
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self.d.close()
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self.dbm = test.support.import_fresh_module('dbm')
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def test_keys(self):
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self.d = dbm.open(self.filename, 'c')
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self.assertEqual(self.d.keys(), [])
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a = [(b'a', b'b'), (b'12345678910', b'019237410982340912840198242')]
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for k, v in a:
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self.d[k] = v
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self.assertEqual(sorted(self.d.keys()), sorted(k for (k, v) in a))
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for k, v in a:
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self.assertIn(k, self.d)
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self.assertEqual(self.d[k], v)
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self.assertNotIn(b'xxx', self.d)
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self.assertRaises(KeyError, lambda: self.d[b'xxx'])
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self.d.close()
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def load_tests(loader, tests, pattern):
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classes = []
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for mod in dbm_iterator():
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classes.append(type("TestCase-" + mod.__name__,
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(AnyDBMTestCase, unittest.TestCase),
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{'module': mod}))
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suites = [unittest.makeSuite(c) for c in classes]
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tests.addTests(suites)
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return tests
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if __name__ == "__main__":
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unittest.main()
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