test dns: contract

tests/test_dns_records.py

@@ -25,8 +25,7 @@ def get_dns_servers():
     if servers == ['127.0.1.1']:
         # NetworkManager
         status, output = subprocess.getstatusoutput('nmcli -f all device show | grep IP4.DNS | awk \'{ print $2 }\'')
-        for l in output.split('\n'):
-            servers.append(l)
+        servers.extend(output.split('\n'))
     return servers