fix unit tests

test/testsocket.py

@@ -59,6 +59,25 @@ def __exit__(self, exc_type, exc_value, traceback):
         """Close the socket"""
         self.close()
 
+    def sr(self, *args, **kargs):
+        # type: (Any, Any) -> Tuple[SndRcvList, PacketList]
+        """Send and Receive multiple packets
+        """
+        from scapy import sendrecv
+        return sendrecv.sndrcv(self, *args, threaded=False, **kargs)
+
+    def sr1(self, *args, **kargs):
+        # type: (Any, Any) -> Optional[Packet]
+        """Send one packet and receive one answer
+        """
+        from scapy import sendrecv
+        ans = sendrecv.sndrcv(self, *args, threaded=False, **kargs)[0]  # type: SndRcvList
+        if len(ans) > 0:
+            pkt = ans[0][1]  # type: Packet
+            return pkt
+        else:
+            return None
+
     def close(self):
         # type: () -> None
         global open_test_sockets