#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
int compar(const void *a, const void *b) {
return *(int *)a - *(int*)b;
}
int main ( int argc , char * argv[] ) {
int t;
scanf("%d" , &t);
while ( t-- ) {
int n , k , i;
scanf("%d%d" , &n,&k);
int * array = (int * ) malloc ( n * sizeof(int) );
for ( i = 0 ; i < n ; i++ ) {
scanf("%d" , &array[i]);
}
qsort( array , n , sizeof(int) , compar);
int min = INT_MAX;
for ( i = 0 ; i < n-k+1 ; i++ ) {
//printf("%d - %d\n" , array[i] , array[i+k-1]);
if ( array[i+k-1] - array[i] < min ) {
min = array[i+k-1] - array[i];
}
}
printf("%d\n" , min);
free(array);
}
return 0;
}
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