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"""Test script for the dumbdbm module
Original by Roger E. Masse
"""
import io
import os
import unittest
import dbm.dumb as dumbdbm
from test import support
_fname = support.TESTFN
def _delete_files():
for ext in [".dir", ".dat", ".bak"]:
try:
os.unlink(_fname + ext)
except OSError:
pass
class DumbDBMTestCase(unittest.TestCase):
_dict = {b'0': b'',
b'a': b'Python:',
b'b': b'Programming',
b'c': b'the',
b'd': b'way',
b'f': b'Guido',
b'g': b'intended',
'\u00fc'.encode('utf-8') : b'!',
}
def test_dumbdbm_creation(self):
f = dumbdbm.open(_fname, 'c')
self.assertEqual(list(f.keys()), [])
for key in self._dict:
f[key] = self._dict[key]
self.read_helper(f)
f.close()
@unittest.skipUnless(hasattr(os, 'umask'), 'test needs os.umask()')
@unittest.skipUnless(hasattr(os, 'chmod'), 'test needs os.chmod()')
def test_dumbdbm_creation_mode(self):
try:
old_umask = os.umask(0o002)
f = dumbdbm.open(_fname, 'c', 0o637)
f.close()
finally:
os.umask(old_umask)
expected_mode = 0o635
if os.name != 'posix':
# Windows only supports setting the read-only attribute.
# This shouldn't fail, but doesn't work like Unix either.
expected_mode = 0o666
import stat
st = os.stat(_fname + '.dat')
self.assertEqual(stat.S_IMODE(st.st_mode), expected_mode)
st = os.stat(_fname + '.dir')
self.assertEqual(stat.S_IMODE(st.st_mode), expected_mode)
def test_close_twice(self):
f = dumbdbm.open(_fname)
f[b'a'] = b'b'
self.assertEqual(f[b'a'], b'b')
f.close()
f.close()
def test_dumbdbm_modification(self):
self.init_db()
f = dumbdbm.open(_fname, 'w')
self._dict[b'g'] = f[b'g'] = b"indented"
self.read_helper(f)
f.close()
def test_dumbdbm_read(self):
self.init_db()
f = dumbdbm.open(_fname, 'r')
self.read_helper(f)
f.close()
def test_dumbdbm_keys(self):
self.init_db()
f = dumbdbm.open(_fname)
keys = self.keys_helper(f)
f.close()
def test_write_contains(self):
f = dumbdbm.open(_fname)
f[b'1'] = b'hello'
self.assertIn(b'1', f)
f.close()
def test_write_write_read(self):
# test for bug #482460
f = dumbdbm.open(_fname)
f[b'1'] = b'hello'
f[b'1'] = b'hello2'
f.close()
f = dumbdbm.open(_fname)
self.assertEqual(f[b'1'], b'hello2')
f.close()
def test_str_read(self):
self.init_db()
f = dumbdbm.open(_fname, 'r')
self.assertEqual(f['\u00fc'], self._dict['\u00fc'.encode('utf-8')])
def test_str_write_contains(self):
self.init_db()
f = dumbdbm.open(_fname)
f['\u00fc'] = b'!'
f['1'] = 'a'
f.close()
f = dumbdbm.open(_fname, 'r')
self.assertIn('\u00fc', f)
self.assertEqual(f['\u00fc'.encode('utf-8')],
self._dict['\u00fc'.encode('utf-8')])
self.assertEqual(f[b'1'], b'a')
def test_line_endings(self):
# test for bug #1172763: dumbdbm would die if the line endings
# weren't what was expected.
f = dumbdbm.open(_fname)
f[b'1'] = b'hello'
f[b'2'] = b'hello2'
f.close()
# Mangle the file by changing the line separator to Windows or Unix
with io.open(_fname + '.dir', 'rb') as file:
data = file.read()
if os.linesep == '\n':
data = data.replace(b'\n', b'\r\n')
else:
data = data.replace(b'\r\n', b'\n')
with io.open(_fname + '.dir', 'wb') as file:
file.write(data)
f = dumbdbm.open(_fname)
self.assertEqual(f[b'1'], b'hello')
self.assertEqual(f[b'2'], b'hello2')
def read_helper(self, f):
keys = self.keys_helper(f)
for key in self._dict:
self.assertEqual(self._dict[key], f[key])
def init_db(self):
f = dumbdbm.open(_fname, 'w')
for k in self._dict:
f[k] = self._dict[k]
f.close()
def keys_helper(self, f):
keys = sorted(f.keys())
dkeys = sorted(self._dict.keys())
self.assertEqual(keys, dkeys)
return keys
# Perform randomized operations. This doesn't make assumptions about
# what *might* fail.
def test_random(self):
import random
d = {} # mirror the database
for dummy in range(5):
f = dumbdbm.open(_fname)
for dummy in range(100):
k = random.choice('abcdefghijklm')
if random.random() < 0.2:
if k in d:
del d[k]
del f[k]
else:
v = random.choice((b'a', b'b', b'c')) * random.randrange(10000)
d[k] = v
f[k] = v
self.assertEqual(f[k], v)
f.close()
f = dumbdbm.open(_fname)
expected = sorted((k.encode("latin-1"), v) for k, v in d.items())
got = sorted(f.items())
self.assertEqual(expected, got)
f.close()
def tearDown(self):
_delete_files()
def setUp(self):
_delete_files()
if __name__ == "__main__":
unittest.main()
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