commit 6020d98beaf6b9945beb7560f9a1df361e0ba4dd
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Tue Jul 17 00:09:32 2018 -0700
committer GitHub <noreply@github.com> Tue Jul 17 00:09:32 2018 -0700
tree e9be672ac74bbee3c0cf97725a71f7a115b054b2
parent 892df9d15aae08d4033faeb34698e3c550c85854

bpo-34068: _io__IOBase_close_impl could call _PyObject_SetAttrId with an exception set (GH-8282)

(cherry picked from commit 28f07364f066792ceee93231dbb80ae8ad98b2bb)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>

Lib/test/test_io.py

diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index a03a7f7..c68b2fe 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -968,6 +968,16 @@
                 self.assertSequenceEqual(buffer[result:], unused)
                 self.assertEqual(len(reader.avail), avail - result)
 
+    def test_close_assert(self):
+        class R(self.IOBase):
+            def __setattr__(self, name, value):
+                pass
+            def flush(self):
+                raise OSError()
+        f = R()
+        # This would cause an assertion failure.
+        self.assertRaises(OSError, f.close)
+
 
 class CIOTest(IOTest):