#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

template<class T>
ostream &operator<<(ostream &io, vector<T> a) {
    io << "{";
    for (auto I:a)io << I << " ";
    io << "}";
    return io;
}

template<class T>
ostream &operator<<(ostream &io, set<T> a) {
    io << "{";
    for (auto I:a)io << I << " ";
    io << "}";
    return io;
}

template<class K, class V>
ostream &operator<<(ostream &io, map<K, V> a) {
    io << "(";
    for (auto I:a)io << "{" << I.first << ":" << I.second << "}";
    io << ")";
    return io;
}

void debug_out() {
    cerr << endl;
}

template<typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << ' ' << H;
    debug_out(T...);
}

#ifdef local
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 55
#endif
#define all(x) x.begin(),x.end()

mt19937_64 Rand(123456);

ll Range(ll l, ll r) {
    return l + Rand() % (r - l + 1);
}

//a+b a-b
//2*a 2*b
const int mod = 998244353;

ll power(ll a,ll b){
    ll res = 1;
    while(b){
        if(b&1)res=res*a%mod;
        a=a*a%mod;
        b>>=1;
    }
    return res;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
#ifdef local
    freopen("../in.txt", "r", stdin);
#endif
    int _;cin>>_;
    while(_--){
        int n,k;cin>>n>>k;
        vector<int> a(n+1);
        for(int i =1;i<=n;i++)cin>>a[i];
        sort(a.begin()+1,a.end());
        int res = 1;
        int last = a[1] - k;
        debug(res,last);
        for(int i =2;i<=n;i++){
            int now = last + 1;
            int L = a[i]-k,R=a[i]+k;
            if(L<=now&&now<=R){
                res++;
            }else{
                if(now>R)now=R;
                else now = L,res++;
            }
            last = now;
            debug(res,last);
        }
        cout<<res<<"\n";
    }
}