SSCRIPT

// https://www.codechef.com/problems/SSCRIPT

/* package codechef; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* 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
	{
		// your code goes here
		Scanner s=new Scanner(System.in);
		int t=s.nextInt();
		while(t-->0)
		{
		    int n=s.nextInt();
		    int k=s.nextInt();
		    String s1=s.next();
		    char[] c=s1.toCharArray();
		    int count=0,flag=0;
		    for(int i=0;i<n;i++)
		    {
		        if(c[i]=='*')
		        {
		            count++;
		        }
		        else
		        {
		            count=0;
		        }
		        if(count>=k)
		        {
		            flag=1;
		            break;
		        }
		    }
		    if(flag==1)
		    {
		        System.out.println("YES");
		    }
		    else
		    {
		        System.out.println("NO");
		    }
		}
	}
}