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Issue #13087: BufferedReader.seek() now always raises UnsupportedOperation

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if the underlying raw stream is unseekable, even if the seek could be
satisfied using the internal buffer.  Patch by John OConnor.
This commit is contained in:
Antoine Pitrou 2011-10-04 12:28:52 +02:00
commit bf009f0bce
3 changed files with 15 additions and 0 deletions
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8
Lib/test/test_io.py
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@ -928,6 +928,14 @@ class BufferedReaderTest(unittest.TestCase, CommonBufferedTests):
finally:
support.unlink(support.TESTFN)
def test_unseekable(self):
bufio = self.tp(self.MockUnseekableIO(b"A" * 10))
self.assertRaises(self.UnsupportedOperation, bufio.tell)
self.assertRaises(self.UnsupportedOperation, bufio.seek, 0)
bufio.read(1)
self.assertRaises(self.UnsupportedOperation, bufio.seek, 0)
self.assertRaises(self.UnsupportedOperation, bufio.tell)
def test_misbehaved_io(self):
rawio = self.MisbehavedRawIO((b"abc", b"d", b"efg"))
bufio = self.tp(rawio)