#include<bits/stdc++.h>
#define ll long long
using namespace std;
int main(){

   ll T; cin>>T;
   while(T--){
      ll N,K; cin>>N>>K;
      ll arr[N];
      ll sum=0;
      ll n=sizeof(arr)/sizeof(arr[0]);
      for(ll i=0;i<N;i++){
         cin>>arr[i];
      }
     sort(arr,arr+n);
      for(ll i=0;i<K;i++){
         sum+=arr[i];

      }
    cout<<sum<<endl;
    sum=0;

   }
   return 0;
}