Issue #5824: Fix DatagramRequestHandler tests by binding the client socket

Lib/socketserver.py

@@ -120,11 +120,6 @@ BaseServer:
 
 # Author of the BaseServer patch: Luke Kenneth Casson Leighton
 
-# XXX Warning!
-# There is a test suite for this module, but it cannot be run by the
-# standard regression test.
-# To run it manually, run Lib/test/test_socketserver.py.
-
 __version__ = "0.4"
 
 
@@ -750,9 +745,6 @@ class StreamRequestHandler(BaseRequestHandler):
 
 class DatagramRequestHandler(BaseRequestHandler):
 
-    # XXX Regrettably, I cannot get this working on Linux;
-    # s.recvfrom() doesn't return a meaningful client address.
-
     """Define self.rfile and self.wfile for datagram sockets."""
 
     def setup(self):

Lib/test/test_socketserver.py

@@ -160,6 +160,8 @@ class SocketServerTest(unittest.TestCase):
 
     def dgram_examine(self, proto, addr):
         s = socket.socket(proto, socket.SOCK_DGRAM)
+        if HAVE_UNIX_SOCKETS and proto == socket.AF_UNIX:
+            s.bind(self.pickaddr(proto))
         s.sendto(TEST_STR, addr)
         buf = data = receive(s, 100)
         while data and b'\n' not in buf:
@@ -222,27 +224,24 @@ class SocketServerTest(unittest.TestCase):
                             socketserver.DatagramRequestHandler,
                             self.dgram_examine)
 
-    # Alas, on Linux (at least) recvfrom() doesn't return a meaningful
-    # client address so this cannot work:
-
-    # @requires_unix_sockets
-    # def test_UnixDatagramServer(self):
-    #     self.run_server(socketserver.UnixDatagramServer,
-    #                     socketserver.DatagramRequestHandler,
-    #                     self.dgram_examine)
-    #
-    # @requires_unix_sockets
-    # def test_ThreadingUnixDatagramServer(self):
-    #     self.run_server(socketserver.ThreadingUnixDatagramServer,
-    #                     socketserver.DatagramRequestHandler,
-    #                     self.dgram_examine)
-    #
-    # @requires_unix_sockets
-    # @requires_forking
-    # def test_ForkingUnixDatagramServer(self):
-    #     self.run_server(socketserver.ForkingUnixDatagramServer,
-    #                     socketserver.DatagramRequestHandler,
-    #                     self.dgram_examine)
+    @requires_unix_sockets
+    def test_UnixDatagramServer(self):
+        self.run_server(socketserver.UnixDatagramServer,
+                        socketserver.DatagramRequestHandler,
+                        self.dgram_examine)
+
+    @requires_unix_sockets
+    def test_ThreadingUnixDatagramServer(self):
+        self.run_server(socketserver.ThreadingUnixDatagramServer,
+                        socketserver.DatagramRequestHandler,
+                        self.dgram_examine)
+
+    @requires_unix_sockets
+    @requires_forking
+    def test_ForkingUnixDatagramServer(self):
+        self.run_server(ForkingUnixDatagramServer,
+                        socketserver.DatagramRequestHandler,
+                        self.dgram_examine)
 
     @reap_threads
     def test_shutdown(self):