package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	in := bufio.NewReader(os.Stdin)
	out := bufio.NewWriter(os.Stdout)
	defer out.Flush()

	var t int
	if _, err := fmt.Fscan(in, &t); err != nil {
		return
	}
	for ; t > 0; t-- {
		var n int
		var s string
		fmt.Fscan(in, &n)
		fmt.Fscan(in, &s)
		m := make(map[int]int64, 2*n+3)
		m[0] = 1
		pref := 0
		var ans int64
		for i := 0; i < n; i++ {
			d := int(s[i] - '0')
			pref += d - 1
			ans += m[pref]
			m[pref]++
		}
		fmt.Fprintln(out, ans)
	}
}