#include<bits/stdc++.h>
using namespace std;
const int MAX_N = 1e5+10;
int t,n,k,a[MAX_N];
int main(){
    ios::sync_with_stdio(0);
    cin>>t;
    while(t--){
        cin>>n>>k;
        for(int i=1;i<=n;i++){
            cin>>a[i];
        }
        sort(a+1,a+n+1);
        int cnt = 1;
        int now = a[1]-k;
        for(int i=2;i<=n;i++){
            if(a[i]-k>now){
                now = a[i]-k;
                cnt++;
            }else{
                if(a[i]==a[i-1]&&now!=a[i]+k){
                    now++;
                    cnt++;
                }else if(now!=a[i]+k){
                    now++;
                    cnt++;
                }
            }
            //cout<<now<<" ";
        }
        cout<<cnt<<'\n';
    }
    
    return 0;
}