我这样写,测试依旧不通过，依旧是timeout。不知道为什么。

import (
“fmt”
“log”
“net/http”
“regexp”
)

// must be accessed atomically

var add = make(chan struct{})
var total = make(chan int)

func getVistors() int {
return <-total
}

func addVistors() {
add <- struct{}{}
}

func teller() {
var visitors int
for {
select {
case <-add:
visitors += 1
case total <- visitors:
}
}
}

func handleHi(w http.ResponseWriter, r *http.Request) {
if match, _ := regexp.MatchString(`^\w*$`, r.FormValue("color")); !match {
http.Error(w, "Optional color is invalid", http.StatusBadRequest)
return
}
addVistors()
visitNum := getVistors()
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.Write([]byte("Welcome!You are visitor number ” + fmt.Sprint(visitNum) + “!”))
}
func main() {
log.Printf(“Starting on port 8080″)
go teller()
http.HandleFunc(“/hi”, handleHi)
log.Fatal(http.ListenAndServe(“127.0.0.1:8080″, nil))
}

请问big white大大,我使用了channel,为什么go test的时候会不成功?
现象是go test timeout。