negtelnetserver.py: have it call its close() method

Closes #9894

diff --git a/tests/negtelnetserver.py b/tests/negtelnetserver.py
index 2b748aff3d9fbae59a800f5df489337f37ab2706..afb9e3342a9cdf33bfbe8db76348591159d254cb 100755 (executable)
--- a/tests/negtelnetserver.py
+++ b/tests/negtelnetserver.py
@@ -66,9 +66,9 @@ def telnetserver(options):
 
     # Need to set the allow_reuse on the class, not on the instance.
     socketserver.TCPServer.allow_reuse_address = True
-    server = socketserver.TCPServer(local_bind, NegotiatingTelnetHandler)
-    server.serve_forever()
-
+    with socketserver.TCPServer(local_bind, NegotiatingTelnetHandler) as server:
+        server.serve_forever()
+    # leaving `with` calls server.close() automatically
     return ScriptRC.SUCCESS