1 files changed, 3 insertions, 0 deletions
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index e826ff4..9d4163e 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -259,6 +259,9 @@ class IOTest(unittest.TestCase):
         self.assertEqual(f.write(a), n)
         f.close()
 
+    def test_closefd(self):
+        self.assertRaises(ValueError, io.open, test_support.TESTFN, 'w',
+                          closefd=False)
 
 class MemorySeekTestMixin: