Tests: prevented writing non-chopped frames to the closed socket.

test/test_node_websockets.py

@@ -818,7 +818,6 @@ class TestNodeWebsockets(TestApplicationNode):
 
         self.check_close(sock, 1002)
 
-    @unittest.skip('not yet')
     def test_node_websockets_5_1__5_20(self):
         self.load('websockets/mirror')
 

test/unit/applications/websockets.py

@@ -173,7 +173,10 @@ class TestApplicationWebsocket(TestApplicationProto):
         frame = self.frame_to_send(*args, **kwargs)
 
         if chopsize is None:
+            try:
                 sock.sendall(frame)
+            except BrokenPipeError:
+                pass
 
         else:
             pos = 0