merge 3.4 (#22849)

1 files changed, 16 insertions, 0 deletions

diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index a3567fa..746f59b 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -2856,6 +2856,22 @@ class TextIOWrapperTest(unittest.TestCase):
 
         self.assertEqual(t.read(200), bytes_val.decode('utf-8'))
 
+    def test_issue22849(self):
+        class F(object):
+            def readable(self): return True
+            def writable(self): return True
+            def seekable(self): return True
+
+        for i in range(10):
+            try:
+                self.TextIOWrapper(F(), encoding='utf-8')
+            except Exception:
+                pass
+
+        F.tell = lambda x: 0
+        t = self.TextIOWrapper(F(), encoding='utf-8')
+
+
 class MemviewBytesIO(io.BytesIO):
     '''A BytesIO object whose read method returns memoryviews
        rather than bytes'''