}

	if err := conf.writeAndUpdate(confLines); err != nil {
		t.Fatal(err)
	}

	var usedServers []string
	fake := fakeDNSServer{rh: func(_, s string, q dnsmessage.Message, deadline time.Time) (dnsmessage.Message, error) {
		usedServers = append(usedServers, s)
		return mockTXTResponse(q), nil
	}}
	r := Resolver{PreferGo: true, Dial: fake.DialContext}