#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef pair<ll,ll> P;
typedef vector<ll> VI;
typedef vector<VI> VVI;
#define REP(i,n) for(int i=0;i<(n);i++)
#define ALL(v) v.begin(),v.end()
constexpr ll MOD=1000000007;
constexpr ll INF=1e18;

int main(){
    int t; cin >> t;
    while(t--){
        int n; cin >> n;
        VI a(n); REP(i,n) cin >> a[i];
        ll ans=0;
        REP(i,n){
            ans=(ans+ans*a[i]+a[i])%MOD;
        }
        cout << ans << endl;
    }
    return 0;
}