1 files changed, 5 insertions, 0 deletions
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index a66726e..0bfa4d2 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -737,6 +737,11 @@ class IOTest(unittest.TestCase):
             file.seek(0)
             file.close()
             self.assertRaises(ValueError, file.read)
+        with self.open(support.TESTFN, "rb") as f:
+            file = self.open(f.fileno(), "rb", closefd=False)
+            self.assertEqual(file.read()[:3], b"egg")
+            file.close()
+            self.assertRaises(ValueError, file.readinto, bytearray(1))
 
     def test_no_closefd_with_filename(self):
         # can't use closefd in combination with a file name