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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int t; cin >> t;
    while (t--) {
        int n, k; cin >> n >> k;
        vector<int> A(n);
        for (int &a: A) cin >> a;
        sort(A.begin(), A.end());
        int pre = -1e9;
        int ans = 0;
        for (int a: A) {
            int left = a - k, right = a + k;
            if (pre >= right) continue;
            pre = max(left, pre + 1);
            ans++;
        }
        cout << ans << endl;

    }
    return 0;
}