#include <bits/stdc++.h>
#pragma GCC optimize("O3")
using namespace std;
using ll = long long;
template <class T>
using V = vector<T>;
const ll inf = (1e18);
const ll mod = 1000000007;
ll GCD(ll a, ll b) { return b ? GCD(b, a % b) : a; }
ll LCM(ll c, ll d) { return c / GCD(c, d) * d; }
struct __INIT {
  __INIT() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(15);
  }
} __init;
template <class T>
bool chmax(T &a, const T &b) {
  if (a < b) {
    a = b;
    return 1;
  }
  return 0;
}
template <class T>
bool chmin(T &a, const T &b) {
  if (a > b) {
    a = b;
    return 1;
  }
  return 0;
}
void pitsu() {
  int n;
  cin >> n;
  V<ll> a(n);
  for (int i = 0; i < n; i++) cin >> a[i];
  sort((a).begin(), (a).end());
  int ans = 0, cnt = 0;
  for (int i = 0; i < n; i++) {
    cnt++;
    if (cnt >= a[i]) {
      ans++;
      cnt = 0;
    }
  }
  cout << ans << "\n";
}
int main() {
  int t;
  cin >> t;
  while (t--) {
    pitsu();
  }
}
