Fix create_server to accept only proto and sock args

Author: 1st1

tests/test_tcp.py

@@ -127,6 +127,10 @@ async def start_server_sock():
         self.loop.run_until_complete(start_server_sock())
         self.assertEqual(CNT, TOTAL_CNT)
 
+    def test_create_server_2(self):
+        with self.assertRaisesRegex(ValueError, 'nor sock were specified'):
+            self.loop.run_until_complete(self.loop.create_server(object))
+
     def test_create_connection_1(self):
         CNT = 0
         TOTAL_CNT = 100

uvloop/loop.pyx

@@ -993,7 +993,7 @@ cdef class Loop:
         return await self._getnameinfo(ai.ai_addr, flags)
 
     @aio_coroutine
-    async def create_server(self, protocol_factory, host, port,
+    async def create_server(self, protocol_factory, host=None, port=None,
                             *,
                             int family=uv.AF_UNSPEC,
                             int flags=uv.AI_PASSIVE,
@@ -1053,6 +1053,8 @@ cdef class Loop:
                 if not completed:
                     server.close()
         else:
+            if sock is None:
+                raise ValueError('Neither host/port nor sock were specified')
             tcp = TCPServer.new(self, protocol_factory, server, ssl)
             fileno = os_dup(sock.fileno())
             try: