/* package codechef; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
 
/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	int t = Integer.parseInt(br.readLine());
	while(t>0){
	    String b = br.readLine();
	    String b1[] = b.split(" ");
	    int n=Integer.parseInt(b1[0]);
	    int k=Integer.parseInt(b1[1]);
    	String a = br.readLine();
    	String a1[] = a.split(" ");
    	int g[] = new int[n];
    	for(int i=0;i<n;i++){
    	    g[i] = Integer.parseInt(a1[i]);
    	}
    	int max=0;
    	for(int i=0;i<=n-k;i++){
    	    int sum=0;
    	    for(int j=i;j<i+k;j++){
    	        sum+=g[j];
    	    }
    	    if(sum>max)
    	        max=sum;
    	}
    	System.out.println(max);
    	t--;
	}
 
	}
}
 

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