1 files changed, 5 insertions, 0 deletions
diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index 4285931..440cd6c 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -3476,6 +3476,11 @@ class FDInheritanceTests(unittest.TestCase):
         self.addCleanup(os.close, fd2)
         self.assertEqual(os.get_inheritable(fd2), False)
 
+    def test_dup_standard_stream(self):
+        fd = os.dup(1)
+        self.addCleanup(os.close, fd)
+        self.assertGreater(fd, 0)
+
     @unittest.skipUnless(sys.platform == 'win32', 'win32-specific test')
     def test_dup_nul(self):
         # os.dup() was creating inheritable fds for character files.