fix TextIOWrapper.read() when the buffer is not readable #5628
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index d5be405..53017f3 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -1754,6 +1754,13 @@
self.assertEquals(f.read(), data * 2)
self.assertEquals(buf.getvalue(), (data * 2).encode(encoding))
+ def test_unreadable(self):
+ class UnReadable(self.BytesIO):
+ def readable(self):
+ return False
+ txt = self.TextIOWrapper(UnReadable())
+ self.assertRaises(IOError, txt.read)
+
def test_read_one_by_one(self):
txt = self.TextIOWrapper(self.BytesIO(b"AA\r\nBB"))
reads = ""