#include <bits/stdc++.h>
#define ll long long

using namespace std;
ll MOD = 1e9+7;

int main() {
    ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
    int t;
    cin >> t;
    while(t--) {
        int x; cin >> x;
        string s;
        cin >> s;
        long long ans=s.size();
        ll l=1;
        ll r=ans-1;
        for (int i=0; i<x; i++) {
            string st=s.substr(i+1);
            //s=s.substr(0,i+1);
            int j=s[i]-'0'-1;
            while (j-- && s.size()<x) {
                s.append(st);           //
            }
            ans=((((ans%MOD-i%MOD-1)%MOD)*(s[i]-'0'))%MOD+(i+1)%MOD)%MOD;
        }
        cout << ans%MOD << endl;
    }
    return 0;
}

/*
 *ans=(ans%MOD-i-1)%MOD*s[i]
 */