}
	slices.Sort(keys)
	return
}

func (t *Transport) IdleConnKeyCountForTesting() int {
	t.idleMu.Lock()
	defer t.idleMu.Unlock()
	return len(t.idleConn)
}

func (t *Transport) IdleConnStrsForTesting() []string {
	var ret []string
	t.idleMu.Lock()
	defer t.idleMu.Unlock()
	for _, conns := range t.idleConn {
		for _, pc := range conns {

	if conns := tr.IdleConnStrsForTesting(); len(conns) != 1 {
		t.Errorf("found %d idle conns (%q); want 1", len(conns), conns)
	}

	// SetKeepAlivesEnabled should discard idle conns.
	ts.Config.SetKeepAlivesEnabled(false)

	waitCondition(t, 10*time.Millisecond, func(d time.Duration) bool {
		if conns := tr.IdleConnStrsForTesting(); len(conns) > 0 {
			if d > 0 {

		defer tr.CloseIdleConnections()
		c := &Client{Transport: tr}

		idleConns := func() []string {
			if mode == http2Mode {
				return tr.IdleConnStrsForTesting_h2()
			} else {
				return tr.IdleConnStrsForTesting()
			}
		}

		var conn string
		doReq := func(n int) (timeoutOk bool) {
			req, _ := NewRequest("GET", cst.ts.URL, nil)