tailscale/net/dnscache/dnscache_test.go

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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package dnscache
import (
"context"
"flag"
"net"
"testing"
"time"
)
var dialTest = flag.String("dial-test", "", "if non-empty, addr:port to test dial")
func TestDialer(t *testing.T) {
if *dialTest == "" {
t.Skip("skipping; --dial-test is blank")
}
r := new(Resolver)
var std net.Dialer
dialer := Dialer(std.DialContext, r)
t0 := time.Now()
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
c, err := dialer(ctx, "tcp", *dialTest)
if err != nil {
t.Fatal(err)
}
t.Logf("dialed in %v", time.Since(t0))
c.Close()
}