#include<bits/stdc++.h>
using namespace std;
int n,a[100005],cnt,B,k;
int T;

int read(){
    int x=0;char ch=getchar();
    while(!isdigit(ch)) ch=getchar();
    while(isdigit(ch)) x=(x<<3)+(x<<1)+(ch^48),ch=getchar();
    return x;
}

void print(int x){
    if(x>=10) print(x/10);
    putchar(x%10+'0');
}

int main(){
    T=read();
    while(T--){
        n=read(),k=read();
        for(int i=1;i<=n;i++) a[i]=read();
        sort(a+1,a+n+1);
        cnt=1,B=a[1]-k;
        for(int i=2;i<=n;i++){
            if(a[i]==a[i-1]){
                if(B+1<=a[i]+k) B++,cnt++;
            }
            else{
                if(B+1<a[i]-k) B=a[i]-k,cnt++;
                else B++,cnt++;
            }
        }
        print(cnt),puts("");
    }

    return 0;
}