1 files changed, 19 insertions, 0 deletions
diff --git a/Lib/test/_test_multiprocessing.py b/Lib/test/_test_multiprocessing.py
index f70a693..058537b 100644
--- a/Lib/test/_test_multiprocessing.py
+++ b/Lib/test/_test_multiprocessing.py
@@ -3504,6 +3504,25 @@ class _TestListener(BaseTestCase):
         if self.TYPE == 'processes':
             self.assertRaises(OSError, l.accept)
 
+    def test_empty_authkey(self):
+        # bpo-43952: allow empty bytes as authkey
+        def handler(*args):
+            raise RuntimeError('Connection took too long...')
+
+        def run(addr, authkey):
+            client = self.connection.Client(addr, authkey=authkey)
+            client.send(1729)
+
+        key = b""
+
+        with self.connection.Listener(authkey=key) as listener:
+            threading.Thread(target=run, args=(listener.address, key)).start()
+            with listener.accept() as d:
+                self.assertEqual(d.recv(), 1729)
+
+        if self.TYPE == 'processes':
+            self.assertRaises(OSError, listener.accept)
+
     @unittest.skipUnless(util.abstract_sockets_supported,
                          "test needs abstract socket support")
     def test_abstract_socket(self):