#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
#define v(T) vector<T>
using namespace std;
using ll = long long;
using P = pair<int, int>;

const int mod = 1000000007;

struct mint {
    ll x;
    mint(ll x=0):x((x%mod+mod)%mod){}
    mint operator-() const { return mint(-x);}
    mint& operator+=(const mint a) {
        if ((x += a.x) >= mod) x -= mod;
        return *this;
    }
    mint& operator-=(const mint a) {
        if ((x += mod-a.x) >= mod) x -= mod;
        return *this;
    }
    mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}
    mint operator+(const mint a) const { return mint(*this) += a;}
    mint operator-(const mint a) const { return mint(*this) -= a;}
    mint operator*(const mint a) const { return mint(*this) *= a;}
    mint pow(ll t) const {
        if (!t) return 1;
        mint a = pow(t>>1);
        a *= a;
        if (t&1) a *= *this;
        return a;
    }

    // for prime mod
    mint inv() const { return pow(mod-2);}
    mint& operator/=(const mint a) { return *this *= a.inv();}
    mint operator/(const mint a) const { return mint(*this) /= a;}
};
istream& operator>>(istream& is, mint& a) { return is >> a.x;}
ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}

void solve(){
    int n;
    cin >> n;
    v(mint) a(n);
    rep(i, 0, n) cin >> a[i];
    queue<mint> q;
    rep(i, 0, n) q.push(a[i]);
    while(q.size() != 1){
        mint x = q.front(); q.pop();
        mint y = q.front(); q.pop();
        q.push((x+y)+(x*y));
    }
    cout << q.front() << endl;
    return;
}

int main()
{
    int t;
    cin >> t;
    while(t--) solve();
    return 0;
}