if err != nil {
		t.Fatal(err)
	}

	if _, err := r.LookupIPAddr(context.Background(), "trustad.go.dev"); err != nil {
		t.Errorf("lookup failed: %v", err)
	}
}

func TestDNSConfigNoReload(t *testing.T) {
	r := &Resolver{PreferGo: true, Dial: func(ctx context.Context, network, address string) (Conn, error) {
		if address != "192.0.2.1:53" {
			return nil, errors.New("configuration unexpectedly changed")