#include <bits/stdc++.h>
using namespace std;
#define int long long
const int maxn=1e5+10;
int a[maxn];
signed main()
{
    int t;
    cin>>t;
    while(t--)
    {
        int n,k;
        cin>>n>>k;
        for(int i=1;i<=n;i++)
            cin>>a[i];
        sort(a+1,a+n+1);
        int ans=0,p=-1e17;
        for(int i=1;i<=n;i++)
        {
            int pp=a[i]-k;
            if(pp>p)
            {
                ans++;
                p=pp;
            }
            else
            {
                if(p<a[i]+k)
                {
                    p++;
                    ans++;
                }
            }
            //cout<<p<<" ";
        }
        //cout<<endl;
        cout<<ans<<endl;
    }
    return 0;
}