#include <iostream>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <utility>
#include <algorithm>
#include <cmath>
#include <climits>
#include <iomanip>
#include <queue>
#include <stack>
#include <ctype.h>

using namespace std;

typedef long long ll;

const int INF = (1<<30)-1;
const ll LINF = 1e18;

#define rep(i, n) for (int i = 0; i < n; i++)

template<class T> 
bool chmax(T &a, T b) {if (a < b) {a = b;return true;}else return false;}

template<class T> 
bool chmin(T &a, T b) {if (a > b) {a = b;return true;}else return false;}

int main() {
    int t;  cin >> t;
    ll mod = 1e9+7;
    while (t--) {
        int n;  cin >> n;
        vector<ll> a(n);
        rep(i, n)    cin >> a[i];
        ll res = a[0];
        rep(i, n-1) {
            res = res + a[i+1] + res * a[i+1];
            res %= mod;
        }
        cout << res << endl;
    }
    return 0;
}

//小数点精度
//cout << fixed << std::setprecision(15) << y << endl;