Issue #13087: BufferedReader.seek() now always raises UnsupportedOperation
if the underlying raw stream is unseekable, even if the seek could be
satisfied using the internal buffer. Patch by John O'Connor.
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 0dc9d6d..53cabbb 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -922,6 +922,14 @@
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)