#pragma GCC optimize("Ofast","inline","-ffast-math")
#pragma GCC target("avx,sse2,sse3,sse4,mmx")
#include <bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/hash_policy.hpp>
#define INF 1000000007
using namespace __gnu_pbds;
using namespace std;

struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};

int n,k,a[100010];
pair<int,int> c[100010];

signed main()
{
    ios::sync_with_stdio(false);
    int t;cin>>t;
    while(t--){
        cin>>n>>k;
        for(int i=1;i<=n;i++) cin>>a[i],c[i]=make_pair(a[i]-k,a[i]+k);
        sort(c+1,c+n+1);
        int ans=0,pre=-INF;
        for(int i=1;i<=n;i++){
            pre=max(pre,c[i].first);
            if(pre<=c[i].second) ans++,pre++;
        }
        cout<<ans<<'\n';
    }
    return 0;
}