#include <bits/stdc++.h>

using namespace std;

#define ll long long int
#define nl endl
#define ss string
#define dl double
#define yes cout << "YES" << nl;
#define no cout << "NO" << nl;


int main() {
    ll t; cin >> t;

    while(t--)
    {
        ll n, k, sum=0;
        cin>>n>>k;
        vector<ll>v(n);

        for (int i = 0; i < v.size(); i++)
    {
        
        cin>>v[i];
    }

    sort(v.begin(), v.end());

    for (int i = 0; i < k; i++)
    {
        sum+=v[i];
    }

    cout<<sum<<endl;



    }
    // for (int i = 1; i <= t; i++)
    // {
        
    //     /* code */
    // }
    
    return 0;
}