#include<bits/stdc++.h>
using namespace std;
#define inf 0x3f3f3f3f
#define IO ios::sync_with_stdio(false)
#define bug cout << "-----\n"
typedef long long ll;
int Mod = 998244353;
const int N = 100010;
const int M = 500010;
ll a[N];
map<ll,ll> mp,mp1;
int main() {
    int T,i,j,n,m;
    cin >> T;
    while(T--) {
        ll sum = 0,k;
        mp.clear();
        mp1.clear();
        cin >> n >> k;
        for(i=1;i<=n;i++)
            cin >> a[i];
        sort(a+1,a+1+n);
        ll x = a[1] - k;
        for(i=1;i<=n;i++) {
            if(abs(a[i]-x)<=k) {
                sum ++;
                x++;
            }
            else if(a[i]-x>k){
                x = a[i]-k;
                x++;
                sum++;
            }
        }
        cout << sum << endl;
    }
    return 0;
}