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304 lines
11 KiB
304 lines
11 KiB
4 months ago
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"""Test script for the dumbdbm module
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Original by Roger E. Masse
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"""
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import contextlib
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import io
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import operator
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import os
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import stat
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import unittest
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import dbm.dumb as dumbdbm
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from test import support
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from functools import partial
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_fname = support.TESTFN
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def _delete_files():
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for ext in [".dir", ".dat", ".bak"]:
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try:
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os.unlink(_fname + ext)
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except OSError:
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pass
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class DumbDBMTestCase(unittest.TestCase):
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_dict = {b'0': b'',
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b'a': b'Python:',
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b'b': b'Programming',
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b'c': b'the',
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b'd': b'way',
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b'f': b'Guido',
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b'g': b'intended',
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'\u00fc'.encode('utf-8') : b'!',
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}
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def test_dumbdbm_creation(self):
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with contextlib.closing(dumbdbm.open(_fname, 'c')) as f:
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self.assertEqual(list(f.keys()), [])
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for key in self._dict:
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f[key] = self._dict[key]
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self.read_helper(f)
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@unittest.skipUnless(hasattr(os, 'umask'), 'test needs os.umask()')
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def test_dumbdbm_creation_mode(self):
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try:
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old_umask = os.umask(0o002)
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f = dumbdbm.open(_fname, 'c', 0o637)
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f.close()
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finally:
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os.umask(old_umask)
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expected_mode = 0o635
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if os.name != 'posix':
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# Windows only supports setting the read-only attribute.
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# This shouldn't fail, but doesn't work like Unix either.
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expected_mode = 0o666
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import stat
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st = os.stat(_fname + '.dat')
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self.assertEqual(stat.S_IMODE(st.st_mode), expected_mode)
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st = os.stat(_fname + '.dir')
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self.assertEqual(stat.S_IMODE(st.st_mode), expected_mode)
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def test_close_twice(self):
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f = dumbdbm.open(_fname)
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f[b'a'] = b'b'
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self.assertEqual(f[b'a'], b'b')
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f.close()
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f.close()
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def test_dumbdbm_modification(self):
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self.init_db()
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with contextlib.closing(dumbdbm.open(_fname, 'w')) as f:
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self._dict[b'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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def test_dumbdbm_read(self):
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self.init_db()
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with contextlib.closing(dumbdbm.open(_fname, 'r')) as f:
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self.read_helper(f)
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with self.assertRaisesRegex(dumbdbm.error,
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'The database is opened for reading only'):
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f[b'g'] = b'x'
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with self.assertRaisesRegex(dumbdbm.error,
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'The database is opened for reading only'):
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del f[b'a']
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# get() works as in the dict interface
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self.assertEqual(f.get(b'a'), self._dict[b'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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def test_dumbdbm_keys(self):
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self.init_db()
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with contextlib.closing(dumbdbm.open(_fname)) as f:
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keys = self.keys_helper(f)
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def test_write_contains(self):
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with contextlib.closing(dumbdbm.open(_fname)) as f:
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f[b'1'] = b'hello'
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self.assertIn(b'1', f)
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def test_write_write_read(self):
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# test for bug #482460
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with contextlib.closing(dumbdbm.open(_fname)) as f:
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f[b'1'] = b'hello'
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f[b'1'] = b'hello2'
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with contextlib.closing(dumbdbm.open(_fname)) as f:
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self.assertEqual(f[b'1'], b'hello2')
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def test_str_read(self):
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self.init_db()
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with contextlib.closing(dumbdbm.open(_fname, 'r')) as f:
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self.assertEqual(f['\u00fc'], self._dict['\u00fc'.encode('utf-8')])
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def test_str_write_contains(self):
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self.init_db()
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with contextlib.closing(dumbdbm.open(_fname)) as f:
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f['\u00fc'] = b'!'
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f['1'] = 'a'
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with contextlib.closing(dumbdbm.open(_fname, 'r')) as f:
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self.assertIn('\u00fc', f)
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self.assertEqual(f['\u00fc'.encode('utf-8')],
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self._dict['\u00fc'.encode('utf-8')])
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self.assertEqual(f[b'1'], b'a')
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def test_line_endings(self):
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# test for bug #1172763: dumbdbm would die if the line endings
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# weren't what was expected.
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with contextlib.closing(dumbdbm.open(_fname)) as f:
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f[b'1'] = b'hello'
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f[b'2'] = b'hello2'
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# Mangle the file by changing the line separator to Windows or Unix
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with io.open(_fname + '.dir', 'rb') as file:
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data = file.read()
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if os.linesep == '\n':
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data = data.replace(b'\n', b'\r\n')
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else:
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data = data.replace(b'\r\n', b'\n')
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with io.open(_fname + '.dir', 'wb') as file:
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file.write(data)
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f = dumbdbm.open(_fname)
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self.assertEqual(f[b'1'], b'hello')
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self.assertEqual(f[b'2'], b'hello2')
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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])
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def init_db(self):
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with contextlib.closing(dumbdbm.open(_fname, 'n')) as f:
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for k in self._dict:
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f[k] = self._dict[k]
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def keys_helper(self, f):
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keys = sorted(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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# Perform randomized operations. This doesn't make assumptions about
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# what *might* fail.
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def test_random(self):
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import random
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d = {} # mirror the database
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for dummy in range(5):
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with contextlib.closing(dumbdbm.open(_fname)) as f:
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for dummy in range(100):
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k = random.choice('abcdefghijklm')
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if random.random() < 0.2:
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if k in d:
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del d[k]
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del f[k]
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else:
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v = random.choice((b'a', b'b', b'c')) * random.randrange(10000)
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d[k] = v
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f[k] = v
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self.assertEqual(f[k], v)
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with contextlib.closing(dumbdbm.open(_fname)) as f:
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expected = sorted((k.encode("latin-1"), v) for k, v in d.items())
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got = sorted(f.items())
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self.assertEqual(expected, got)
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def test_context_manager(self):
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with dumbdbm.open(_fname, 'c') as db:
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db["dumbdbm context manager"] = "context manager"
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with dumbdbm.open(_fname, 'r') as db:
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self.assertEqual(list(db.keys()), [b"dumbdbm context manager"])
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with self.assertRaises(dumbdbm.error):
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db.keys()
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def test_check_closed(self):
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f = dumbdbm.open(_fname, 'c')
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f.close()
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for meth in (partial(operator.delitem, f),
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partial(operator.setitem, f, 'b'),
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partial(operator.getitem, f),
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partial(operator.contains, f)):
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with self.assertRaises(dumbdbm.error) as cm:
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meth('test')
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self.assertEqual(str(cm.exception),
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"DBM object has already been closed")
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for meth in (operator.methodcaller('keys'),
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operator.methodcaller('iterkeys'),
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operator.methodcaller('items'),
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len):
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with self.assertRaises(dumbdbm.error) as cm:
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meth(f)
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self.assertEqual(str(cm.exception),
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"DBM object has already been closed")
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def test_create_new(self):
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with dumbdbm.open(_fname, 'n') as f:
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for k in self._dict:
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f[k] = self._dict[k]
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with dumbdbm.open(_fname, 'n') as f:
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self.assertEqual(f.keys(), [])
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def test_eval(self):
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with open(_fname + '.dir', 'w') as stream:
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stream.write("str(print('Hacked!')), 0\n")
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with support.captured_stdout() as stdout:
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with self.assertRaises(ValueError):
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with dumbdbm.open(_fname) as f:
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pass
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self.assertEqual(stdout.getvalue(), '')
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def test_missing_data(self):
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for value in ('r', 'w'):
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_delete_files()
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with self.assertRaises(FileNotFoundError):
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dumbdbm.open(_fname, value)
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self.assertFalse(os.path.exists(_fname + '.dir'))
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self.assertFalse(os.path.exists(_fname + '.bak'))
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def test_missing_index(self):
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with dumbdbm.open(_fname, 'n') as f:
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pass
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os.unlink(_fname + '.dir')
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for value in ('r', 'w'):
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with self.assertRaises(FileNotFoundError):
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dumbdbm.open(_fname, value)
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self.assertFalse(os.path.exists(_fname + '.dir'))
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self.assertFalse(os.path.exists(_fname + '.bak'))
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def test_invalid_flag(self):
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for flag in ('x', 'rf', None):
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with self.assertRaisesRegex(ValueError,
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"Flag must be one of "
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"'r', 'w', 'c', or 'n'"):
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dumbdbm.open(_fname, flag)
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def test_readonly_files(self):
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with support.temp_dir() as dir:
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fname = os.path.join(dir, 'db')
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with dumbdbm.open(fname, 'n') as f:
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self.assertEqual(list(f.keys()), [])
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for key in self._dict:
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f[key] = self._dict[key]
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os.chmod(fname + ".dir", stat.S_IRUSR)
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os.chmod(fname + ".dat", stat.S_IRUSR)
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os.chmod(dir, stat.S_IRUSR|stat.S_IXUSR)
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with dumbdbm.open(fname, 'r') as f:
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self.assertEqual(sorted(f.keys()), sorted(self._dict))
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f.close() # don't write
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@unittest.skipUnless(support.TESTFN_NONASCII,
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'requires OS support of non-ASCII encodings')
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def test_nonascii_filename(self):
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filename = support.TESTFN_NONASCII
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for suffix in ['.dir', '.dat', '.bak']:
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self.addCleanup(support.unlink, filename + suffix)
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with dumbdbm.open(filename, 'c') as db:
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db[b'key'] = b'value'
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self.assertTrue(os.path.exists(filename + '.dat'))
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self.assertTrue(os.path.exists(filename + '.dir'))
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with dumbdbm.open(filename, 'r') as db:
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self.assertEqual(list(db.keys()), [b'key'])
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self.assertTrue(b'key' in db)
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self.assertEqual(db[b'key'], b'value')
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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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if __name__ == "__main__":
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unittest.main()
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