#include <bits/stdc++.h>
#define ll long long
#define pub push_back
#define fast                      \
    ios_base::sync_with_stdio(0); \
    cin.tie(0);
using namespace std;
void solve()
{
    int n;
    cin >> n;
    map<int, int> mp;
    ll s = 0;
    for (int i = 1; i <= n; i++)
    {
        int x;
        cin >> x;
        if (x == 0)
            continue;

        if (mp[x] == 1)
            s += x;
        mp[x] = 1;
    }
    int i;
    for (i = 1;; i++)
    {
        if (mp[i] == 0)
        {
            if (s >= i)
            {
                s -= i;
            }
            else
            {
                break;
            }
        }
    }
    cout << i << endl;
}
int main()
{
    fast;
    ll t;
    cin >> t;
    while (t--)
    {
        solve();
    }
    return 0;
}