/**
*    author:  shu8Cream
*    created: 15.01.2021 21:11:10
**/

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i=0; i<(n); i++)
#define all(x) (x).begin(), (x).end()
using ll = long long;
using P = pair<int,int>;
using vi = vector<int>;
using vvi = vector<vi>;

const int mod = 1e9+7;

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int t;
    cin >> t;
    while(t--){
        int n; cin >> n;
        vi a(n);
        rep(i,n) cin >> a[i];
        int last=0;
        rep(i,n-1){
            int len = a.size();
            last=a[len-1]+a[len-2] + a[len-1]*a[len-2];
            a.pop_back();
            a.pop_back();
            a.push_back(last);
        }
        cout << last%mod << endl;
    }
}