// pending dials.
func SetPendingDialHooks(before, after func()) {
	unnilTestHook(&before)
	unnilTestHook(&after)
	testHookPrePendingDial, testHookPostPendingDial = before, after
}

func SetTestHookServerServe(fn func(*Server, net.Listener)) { testHookServerServe = fn }

func SetTestHookProxyConnectTimeout(t *testing.T, f func(context.Context, time.Duration) (context.Context, context.CancelFunc)) {

	defer afterTest(t)
	defer SetTestHookServerServe(nil)
	var ok bool
	var s *Server
	const maxTries = 5
	var ln net.Listener
Try:
	for try := 0; try < maxTries; try++ {
		ln = newLocalListener(t)
		addr := ln.Addr().String()
		ln.Close()
		t.Logf("Got %v", addr)
		lnc := make(chan net.Listener, 1)
		SetTestHookServerServe(func(s *Server, ln net.Listener) {
			lnc <- ln
		})