#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

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

typedef pair<int, int> pii;
#define all(x) x.begin(), x.end()
int main() {
#ifdef local
    freopen("../in.txt", "r", stdin);
#endif
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
    int T;
    cin >> T;
    while(T--){
        int n, k;
        cin >> n >> k;
        vector<pii> v;
        for(int i = 0, x; i < n; i++){
            cin >> x;
            v.emplace_back(x - k, x + k);
        }
        sort(all(v));
        int now = -2e9 - 5, ans = 0;
        for(auto& e: v){
            if(now < e.first) now = e.first, ans++;
            else if(now < e.second) now++, ans++;
        }
        cout << ans << '\n';
    }
    return 0;
}