add test for #20251

diff --git a/Lib/test/test_socket.py b/Lib/test/test_socket.py
index 2df6dd65210fa552b4b5b4637b0a56895677b8e9..ce3c16ca821611d0bb8bb899f7b3f218213a4a56 100644 (file)
--- a/Lib/test/test_socket.py
+++ b/Lib/test/test_socket.py
@@ -4546,6 +4546,13 @@ class BufferIOTest(SocketConnectedTest):
     def _testRecvFromIntoSmallBuffer(self):
         self.serv_conn.send(MSG*2048)
 
+    def testRecvFromIntoEmptyBuffer(self):
+        buf = bytearray()
+        self.cli_conn.recvfrom_into(buf)
+        self.cli_conn.recvfrom_into(buf, 0)
+
+    _testRecvFromIntoEmptyBuffer = _testRecvFromIntoArray
+
 
 TIPC_STYPE = 2000
 TIPC_LOWER = 200