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"""Test script for the dbm.open function based on testdumbdbm.py"""
import unittest
import dbm
import os
from test.support import import_helper
from test.support import os_helper
try:
from dbm import ndbm
except ImportError:
ndbm = None
dirname = os_helper.TESTFN
_fname = os.path.join(dirname, os_helper.TESTFN)
#
# Iterates over every database module supported by dbm currently available.
#
def dbm_iterator():
for name in dbm._names:
try:
mod = __import__(name, fromlist=['open'])
except ImportError:
continue
dbm._modules[name] = mod
yield mod
#
# Clean up all scratch databases we might have created during testing
#
def cleaunup_test_dir():
os_helper.rmtree(dirname)
def setup_test_dir():
cleaunup_test_dir()
os.mkdir(dirname)
class AnyDBMTestCase:
_dict = {'a': b'Python:',
'b': b'Programming',
'c': b'the',
'd': b'way',
'f': b'Guido',
'g': b'intended',
}
def init_db(self):
f = dbm.open(_fname, 'n')
for k in self._dict:
f[k.encode("ascii")] = self._dict[k]
f.close()
def keys_helper(self, f):
keys = sorted(k.decode("ascii") for k in f.keys())
dkeys = sorted(self._dict.keys())
self.assertEqual(keys, dkeys)
return keys
def test_error(self):
self.assertTrue(issubclass(self.module.error, OSError))
def test_anydbm_not_existing(self):
self.assertRaises(dbm.error, dbm.open, _fname)
def test_anydbm_creation(self):
f = dbm.open(_fname, 'c')
self.assertEqual(list(f.keys()), [])
for key in self._dict:
f[key.encode("ascii")] = self._dict[key]
self.read_helper(f)
f.close()
def test_anydbm_creation_n_file_exists_with_invalid_contents(self):
# create an empty file
os_helper.create_empty_file(_fname)
with dbm.open(_fname, 'n') as f:
self.assertEqual(len(f), 0)
def test_anydbm_modification(self):
self.init_db()
f = dbm.open(_fname, 'c')
self._dict['g'] = f[b'g'] = b"indented"
self.read_helper(f)
# setdefault() works as in the dict interface
self.assertEqual(f.setdefault(b'xxx', b'foo'), b'foo')
self.assertEqual(f[b'xxx'], b'foo')
f.close()
def test_anydbm_read(self):
self.init_db()
f = dbm.open(_fname, 'r')
self.read_helper(f)
# get() works as in the dict interface
self.assertEqual(f.get(b'a'), self._dict['a'])
self.assertEqual(f.get(b'xxx', b'foo'), b'foo')
self.assertIsNone(f.get(b'xxx'))
with self.assertRaises(KeyError):
f[b'xxx']
f.close()
def test_anydbm_keys(self):
self.init_db()
f = dbm.open(_fname, 'r')
keys = self.keys_helper(f)
f.close()
def test_empty_value(self):
if getattr(dbm._defaultmod, 'library', None) == 'Berkeley DB':
self.skipTest("Berkeley DB doesn't distinguish the empty value "
"from the absent one")
f = dbm.open(_fname, 'c')
self.assertEqual(f.keys(), [])
f[b'empty'] = b''
self.assertEqual(f.keys(), [b'empty'])
self.assertIn(b'empty', f)
self.assertEqual(f[b'empty'], b'')
self.assertEqual(f.get(b'empty'), b'')
self.assertEqual(f.setdefault(b'empty'), b'')
f.close()
def test_anydbm_access(self):
self.init_db()
f = dbm.open(_fname, 'r')
key = "a".encode("ascii")
self.assertIn(key, f)
assert(f[key] == b"Python:")
f.close()
def test_open_with_bytes(self):
dbm.open(os.fsencode(_fname), "c").close()
def test_open_with_pathlib_path(self):
dbm.open(os_helper.FakePath(_fname), "c").close()
def test_open_with_pathlib_path_bytes(self):
dbm.open(os_helper.FakePath(os.fsencode(_fname)), "c").close()
def read_helper(self, f):
keys = self.keys_helper(f)
for key in self._dict:
self.assertEqual(self._dict[key], f[key.encode("ascii")])
def test_keys(self):
with dbm.open(_fname, 'c') as d:
self.assertEqual(d.keys(), [])
a = [(b'a', b'b'), (b'12345678910', b'019237410982340912840198242')]
for k, v in a:
d[k] = v
self.assertEqual(sorted(d.keys()), sorted(k for (k, v) in a))
for k, v in a:
self.assertIn(k, d)
self.assertEqual(d[k], v)
self.assertNotIn(b'xxx', d)
self.assertRaises(KeyError, lambda: d[b'xxx'])
def setUp(self):
self.addCleanup(setattr, dbm, '_defaultmod', dbm._defaultmod)
dbm._defaultmod = self.module
self.addCleanup(cleaunup_test_dir)
setup_test_dir()
class WhichDBTestCase(unittest.TestCase):
def test_whichdb(self):
self.addCleanup(setattr, dbm, '_defaultmod', dbm._defaultmod)
_bytes_fname = os.fsencode(_fname)
fnames = [_fname, os_helper.FakePath(_fname),
_bytes_fname, os_helper.FakePath(_bytes_fname)]
for module in dbm_iterator():
# Check whether whichdb correctly guesses module name
# for databases opened with "module" module.
name = module.__name__
setup_test_dir()
dbm._defaultmod = module
# Try with empty files first
with module.open(_fname, 'c'): pass
for path in fnames:
self.assertEqual(name, self.dbm.whichdb(path))
# Now add a key
with module.open(_fname, 'w') as f:
f[b"1"] = b"1"
# and test that we can find it
self.assertIn(b"1", f)
# and read it
self.assertEqual(f[b"1"], b"1")
for path in fnames:
self.assertEqual(name, self.dbm.whichdb(path))
@unittest.skipUnless(ndbm, reason='Test requires ndbm')
def test_whichdb_ndbm(self):
# Issue 17198: check that ndbm which is referenced in whichdb is defined
with open(_fname + '.db', 'wb'): pass
_bytes_fname = os.fsencode(_fname)
fnames = [_fname, os_helper.FakePath(_fname),
_bytes_fname, os_helper.FakePath(_bytes_fname)]
for path in fnames:
self.assertIsNone(self.dbm.whichdb(path))
def setUp(self):
self.addCleanup(cleaunup_test_dir)
setup_test_dir()
self.dbm = import_helper.import_fresh_module('dbm')
for mod in dbm_iterator():
assert mod.__name__.startswith('dbm.')
suffix = mod.__name__[4:]
testname = f'TestCase_{suffix}'
globals()[testname] = type(testname,
(AnyDBMTestCase, unittest.TestCase),
{'module': mod})
if __name__ == "__main__":
unittest.main()
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