// 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)) {