#include<bits/stdc++.h>
#define int long long
using namespace std;
const int maxn=1e5+100; 
const int mode=998244353;
int read(){
    int x=0,f=1;char ch=getchar();
    while(!isdigit(ch)){
        if(ch=='-') f=-1;
        ch=getchar();
    }
    while(isdigit(ch)){
        x=x*10+ch-'0';
        ch=getchar();
    }
    return x*f; 
}
int t,n,k,si[maxn];
signed main(){
    t=read();
    while(t--){
        n=read(); k=read();
        for(int i=1;i<=n;++i) si[i]=read();
        sort(si+1,si+1+n);
        int last=-1243242343234,ans=0;
        for(int i=1;i<=n;++i){
            if(si[i]-k>last) last=si[i]-k;
            else if(si[i]+k<=last) ans++;
            else last++;
        }
        cout<<n-ans<<"\n";
    }
}