import java.util.*;

class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int t = sc.nextInt();

        while(t-- > 0) {
            int n = sc.nextInt();
            int k = sc.nextInt();
            long[] a = new long[n];
            for(int i = 0; i < n; i++) {
                a[i] = sc.nextLong();
            }   
            Arrays.sort(a);
            if (n == 1) {
                System.out.println(0);
                continue;
            }
            long s = 0;
            for(int i = n - 1, j = 0; i >= 0; i--) {
                a[i - 1] += a[i];
                s = a[i - 1];
                j++;
                if (j == k) {
                    break;   
                }
            }
            System.out.println(s);
        }
    }
}