#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
#define _for(i,a,b) for(register int (i)=(a);(i)<=(b);(i)++)
#define For(i,a,b) for(register int (i)=(a);(i)>=(b);(i)--)
#define INF 0x7fffffff
#define il inline
#define rg register
ll n,m,p[100010],now,ans;
int main(){
    int T; scanf("%d",&T);
    while(T--){
        scanf("%lld%lld",&n,&m);
        _for(i,1,n) scanf("%lld",&p[i]);
        sort(p+1,p+n+1);
        now=p[1]-m;
        ans=1;
        _for(i,2,n){
            if(p[i]+m<=now) continue;
            if(p[i]-m>now) now=p[i]-m;
            else if(p[i]-m<=now) now++;
            ans++;
        }
        printf("%lld\n",ans);
    }
    return 0;
}