Tests the message ID. Closes #17

homer.py

@@ -303,11 +303,14 @@ def do_test(connection, qname, qtype=rtype):
     if connection.dot:
         messagew = message.to_wire() 
         length = len(messagew)
+        id = message.id
         n = connection.session.send(length.to_bytes(2, byteorder='big') + messagew)
         buf = connection.session.recv(2) 
         received = int.from_bytes(buf, byteorder='big')
         buf = connection.session.recv(received)
-        response = dns.message.from_wire(buf) 
+        response = dns.message.from_wire(buf)
+        if response.id != message.id:
+            raise Exception("The ID in the answer does not match the one in the query")
         return (True, response, received)
     else: # DoH
         message.id = 0 # DoH requests that