#include<bits/stdc++.h>
using namespace std;
#define ll long long int 
int main()
{
    ll tc;
    cin>>tc;
    while(tc--)
    {
        ll n,k;
        cin>>n>>k;
        vector<ll>v(n);
        for(int i=0;i<n;i++)
            cin>>v[i];
        sort(v.begin(),v.end());
        ll ans=0;
        for(int i=0;i<min(n,k);i++)
            ans+=v[i];
        cout<<ans<<endl;
    }
}