+ def test_locked_file(self):
+ TEXT = 'test_locked_file\n'
+ FILE = 'test_locked_file.ytdl'
+ MODES = 'war' # Order is important
+
+ try:
+ for lock_mode in MODES:
+ with locked_file(FILE, lock_mode, False) as f:
+ if lock_mode == 'r':
+ self.assertEqual(f.read(), TEXT * 2, 'Wrong file content')
+ else:
+ f.write(TEXT)
+ for test_mode in MODES:
+ testing_write = test_mode != 'r'
+ try:
+ with locked_file(FILE, test_mode, False):
+ pass
+ except (BlockingIOError, PermissionError):
+ if not testing_write: # FIXME
+ print(f'Known issue: Exclusive lock ({lock_mode}) blocks read access ({test_mode})')
+ continue
+ self.assertTrue(testing_write, f'{test_mode} is blocked by {lock_mode}')
+ else:
+ self.assertFalse(testing_write, f'{test_mode} is not blocked by {lock_mode}')
+ finally:
+ try:
+ os.remove(FILE)
+ except Exception:
+ pass
+