#include <bits/stdc++.h>
#define mp make_pair
#define fi first
#define se second
#define debug(x) cerr << #x << " = " << (x) << endl
#define EPS 1e-9
#define PI acos(-1.0)
using namespace std;
void test() { cerr << endl; }
template <typename T, typename... Args>
void test(T x, Args... args) {
  cerr << x << " ";
  test(args...);
}
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int MAXN = (int)1e5 + 10;
const int MOD = 998244353;
const int INF = 1e9;
void Main() {
  int n, k;
  cin >> n >> k;
  vector<pii> ve;
  for (int i = 0; i < n; i++) {
    int x;
    cin >> x;
    ve.push_back({x - k, x + k});
  }
  sort(ve.begin(), ve.end());
  int cnt = 1, mi = ve[0].fi;
  for (int i = 1; i < n; i++) {
    int l = ve[i].fi, r = ve[i].se;
    if (mi >= r) continue;
    if (mi < l) {
      mi = l;
    } else {
      mi++;
    }
    cnt++;
  }
  cout << cnt << "\n";
}
int main() {
  #ifdef BanFcc
    freopen("in.txt", "r", stdin);
  ///  freopen("out.txt", "w", stdout);
  #else
    ios_base:: sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cout << fixed << setprecision(10);
  #endif
  int T = 1;
  cin >> T;
  for (int ca = 1; ca <= T; ca++) {
   // cout << "Case #" << ca << ": ";
    Main();
  }
  return 0;
}