#include "stdio.h"
#include "math.h"
#include "string.h"
#define ll unsigned int
#define gc getchar_unlocked
#define pc putchar_unlocked
inline ll r()
{
	ll x=0;
	char c=gc();
	while(c<48||c>57)
		c=gc();
	while(c>=48&&c<=57)
	{
		x=x*10+c-48;
		c=gc();
	}
	return x;
}
int main()
{
	ll A,B,i,t,max,ct;
	char c;
	t=r();
	while(t--)
	{
		A=r();	B=r();
		ct=max=0;
		while((c=gc())!='\n'&&c!=EOF)
		{
			if(c=='#')
				ct++;
			else
				ct=0;
			if(ct>max)
				max=ct;
		}
		if(max>=B)
			printf("NO\n");
		else
			printf("YES\n");
	}
return 0;
}

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Mgo1IDMKLiMjIy4KNiAyCi4jLiMuIw==

2
5 3
.###.
6 2
.#.#.#