#include <bits/stdc++.h>
using namespace std;
int main()
{
    int t;
    cin >> t;
    while (t--)
    {
        int n, k;
        cin >> n >> k;
        int ar[n];
        for (auto c : ar)
        {
            cin >> c;
        }
        sort(ar, ar + n);
        int sum(0);
        for (int i = 0; i < k; i++)
        {
            sum += ar[i];
        }
        cout << sum << endl;
    }
}