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"""Test script for the dbm.open function based on testdumbdbm.py"""
import unittest
import glob
from test.support import import_helper
from test.support import os_helper
# Skip tests if dbm module doesn't exist.
dbm = import_helper.import_module('dbm')
try:
from dbm import ndbm
except ImportError:
ndbm = None
_fname = os_helper.TESTFN
#
# Iterates over every database module supported by dbm currently available,
# setting dbm to use each in turn, and yielding that module
#
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 delete_files():
# we don't know the precise name the underlying database uses
# so we use glob to locate all names
for f in glob.glob(glob.escape(_fname) + "*"):
os_helper.unlink(f)
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 read_helper(self, f):
keys = self.keys_helper(f)
for key in self._dict:
self.assertEqual(self._dict[key], f[key.encode("ascii")])
def tearDown(self):
delete_files()
def setUp(self):
dbm._defaultmod = self.module
delete_files()
class WhichDBTestCase(unittest.TestCase):
def test_whichdb(self):
for module in dbm_iterator():
# Check whether whichdb correctly guesses module name
# for databases opened with "module" module.
# Try with empty files first
name = module.__name__
if name == 'dbm.dumb':
continue # whichdb can't support dbm.dumb
delete_files()
f = module.open(_fname, 'c')
f.close()
self.assertEqual(name, self.dbm.whichdb(_fname))
# Now add a key
f = module.open(_fname, 'w')
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")
f.close()
self.assertEqual(name, self.dbm.whichdb(_fname))
@unittest.skipUnless(ndbm, reason='Test requires ndbm')
def test_whichdb_ndbm(self):
# Issue 17198: check that ndbm which is referenced in whichdb is defined
db_file = '{}_ndbm.db'.format(_fname)
with open(db_file, 'w'):
self.addCleanup(os_helper.unlink, db_file)
self.assertIsNone(self.dbm.whichdb(db_file[:-3]))
def tearDown(self):
delete_files()
def setUp(self):
delete_files()
self.filename = os_helper.TESTFN
self.d = dbm.open(self.filename, 'c')
self.d.close()
self.dbm = import_helper.import_fresh_module('dbm')
def test_keys(self):
self.d = dbm.open(self.filename, 'c')
self.assertEqual(self.d.keys(), [])
a = [(b'a', b'b'), (b'12345678910', b'019237410982340912840198242')]
for k, v in a:
self.d[k] = v
self.assertEqual(sorted(self.d.keys()), sorted(k for (k, v) in a))
for k, v in a:
self.assertIn(k, self.d)
self.assertEqual(self.d[k], v)
self.assertNotIn(b'xxx', self.d)
self.assertRaises(KeyError, lambda: self.d[b'xxx'])
self.d.close()
def load_tests(loader, tests, pattern):
classes = []
for mod in dbm_iterator():
classes.append(type("TestCase-" + mod.__name__,
(AnyDBMTestCase, unittest.TestCase),
{'module': mod}))
suites = [unittest.makeSuite(c) for c in classes]
tests.addTests(suites)
return tests
if __name__ == "__main__":
unittest.main()
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