#include <bits/stdc++.h>
using namespace std;

int t, n;
string s;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin >> t;
    for(int cases = 0; cases < t; cases++)
    {
        cin >> n >> s;
        int cursum = 0;
        map<int, int> cnt;
        cnt[0]++;
        for(int i = 0; i < n; i++)
        {
            cursum += s[i] - '0';
            cnt[cursum - (i + 1)]++;
        }
        long long ans = 0;
        for(auto x : cnt)
        {
            long long have = x.second - 1;
            ans += (have * (have + 1)) / 2;
        }
        cout << ans << "\n";
    }
    return 0;
}