diff options
Diffstat (limited to 'Lib/test/test_io.py')
| -rw-r--r-- | Lib/test/test_io.py | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py index 0bfa4d249e..c27dfd96bc 100644 --- a/Lib/test/test_io.py +++ b/Lib/test/test_io.py @@ -1528,6 +1528,13 @@ class BufferedReaderTest(unittest.TestCase, CommonBufferedTests): self.assertRaises(ValueError, b.peek) self.assertRaises(ValueError, b.read1, 1) + def test_truncate_on_read_only(self): + rawio = self.MockFileIO(b"abc") + bufio = self.tp(rawio) + self.assertFalse(bufio.writable()) + self.assertRaises(self.UnsupportedOperation, bufio.truncate) + self.assertRaises(self.UnsupportedOperation, bufio.truncate, 0) + class CBufferedReaderTest(BufferedReaderTest, SizeofTest): tp = io.BufferedReader @@ -2372,6 +2379,10 @@ class BufferedRandomTest(BufferedReaderTest, BufferedWriterTest): # You can't construct a BufferedRandom over a non-seekable stream. test_unseekable = None + # writable() returns True, so there's no point to test it over + # a writable stream. + test_truncate_on_read_only = None + class CBufferedRandomTest(BufferedRandomTest, SizeofTest): tp = io.BufferedRandom |