#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    int a[n];
    for (int i = 0; i < n; i++) {
      cin >> a[i];
    }
    sort(a, a + n);
    int count = 0;
    int groups = 0;
    for (int i = 0; i < n; i++) {
      if (++count == a[i]) {
        count = 0;
        groups++;
      }
    }
    cout << groups << endl;
  }
}
