1 files changed, 6 insertions, 0 deletions
diff --git a/Lib/test/test_asyncio/test_streams.py b/Lib/test/test_asyncio/test_streams.py
index a1c62ecee66..eab71e80308 100644
--- a/Lib/test/test_asyncio/test_streams.py
+++ b/Lib/test/test_asyncio/test_streams.py
@@ -1779,6 +1779,12 @@ os.close(fd)
 
         self.loop.run_until_complete(test())
 
+    def test_stream_ctor_forbidden(self):
+        with self.assertRaisesRegex(RuntimeError,
+                                    "should be instantiated "
+                                    "by asyncio internals only"):
+            asyncio.Stream(asyncio.StreamMode.READWRITE)
+
 
 if __name__ == '__main__':
     unittest.main()