// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// TODO It would be nice to use a mock DNS server, to eliminate
// external dependencies.

package net

import (
	"flag"
	"testing"
)

var testExternal = flag.Bool("external", false, "allow use of external networks during test")

func TestGoogleSRV(t *testing.T) {
	if testing.Short() || !*testExternal {
		t.Logf("skipping test to avoid external network")
		return
	}
	_, addrs, err := LookupSRV("xmpp-server", "tcp", "google.com")
	if err != nil {
		t.Errorf("failed: %s", err)
	}
	if len(addrs) == 0 {
		t.Errorf("no results")
	}

	// Non-standard back door.
	_, addrs, err = LookupSRV("", "", "_xmpp-server._tcp.google.com")
	if err != nil {
		t.Errorf("back door failed: %s", err)
	}
	if len(addrs) == 0 {
		t.Errorf("back door no results")
	}
}

func TestGmailMX(t *testing.T) {
	if testing.Short() || !*testExternal {
		t.Logf("skipping test to avoid external network")
		return
	}
	mx, err := LookupMX("gmail.com")
	if err != nil {
		t.Errorf("failed: %s", err)
	}
	if len(mx) == 0 {
		t.Errorf("no results")
	}
}

func TestGmailTXT(t *testing.T) {
	if testing.Short() || !*testExternal {
		t.Logf("skipping test to avoid external network")
		return
	}
	txt, err := LookupTXT("gmail.com")
	if err != nil {
		t.Errorf("failed: %s", err)
	}
	if len(txt) == 0 || len(txt[0]) == 0 {
		t.Errorf("no results")
	}
}

func TestGoogleDNSAddr(t *testing.T) {
	if testing.Short() || !*testExternal {
		t.Logf("skipping test to avoid external network")
		return
	}
	names, err := LookupAddr("8.8.8.8")
	if err != nil {
		t.Errorf("failed: %s", err)
	}
	if len(names) == 0 {
		t.Errorf("no results")
	}
}