如何停止一个Goroutine

func TestStopGoroutine(t *testing.T) {
    stopChan := make(chan struct{})
    go func() {
        for {
            select {
            case <-stopChan:
                return
            default:
                println("goroutine is running")
                time.Sleep(time.Second)
            }
        }
    }()
    time.Sleep(time.Second * 5)
    close(stopChan)
    fmt.Println("stop goroutine")
}