+class CollectionOpenModes(run_test_server.TestCaseWithServers):
+
+ def test_open_binary_modes(self):
+ c = Collection()
+ for mode in ['wb', 'wb+', 'ab', 'ab+']:
+ with c.open('foo', 'wb') as f:
+ f.write(b'foo')
+
+ def test_open_invalid_modes(self):
+ c = Collection()
+ for mode in ['+r', 'aa', '++', 'r+b', 'beer', '', None]:
+ with self.assertRaises(Exception):
+ c.open('foo', mode)
+
+ def test_open_text_modes(self):
+ c = Collection()
+ with c.open('foo', 'wb') as f:
+ f.write('foo')
+ for mode in ['r', 'rt', 'r+', 'rt+', 'w', 'wt', 'a', 'at']:
+ if sys.version_info >= (3, 0):
+ with self.assertRaises(NotImplementedError):
+ c.open('foo', mode)
+ else:
+ with c.open('foo', mode) as f:
+ if mode[0] == 'r' and '+' not in mode:
+ self.assertEqual('foo', f.read(3))
+ else:
+ f.write('bar')
+ f.seek(-3, os.SEEK_CUR)
+ self.assertEqual('bar', f.read(3))
+
+