#include <bits/stdc++.h>
using namespace std;
const long long INF = 1001001001001001001ll;
const long long LINF = 1001001001001001001ll;
const long long MOD = 1000000007;
const double EPS = 1e-9;
template <typename T>
ostream& operator<<(ostream& s, const vector<T>& v) {
  long long len = v.size();
  for (long long i = 0; i < len; ++i) {
    s << v[i];
    if (i < len - 1) s << ' ';
  }
  return s;
}
template <typename T>
ostream& operator<<(ostream& s, const vector<vector<T>>& vv) {
  long long len = vv.size();
  for (long long i = 0; i < len; ++i) {
    s << vv[i];
    if (i != len - 1) s << '\n';
  }
  return s;
}
template <class T>
inline bool chmin(T& a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <class T>
inline bool chmax(T& a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
__attribute__((constructor)) void initial() {
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(15);
}
signed main() {
  long long T;
  cin >> T;
  while (T-- > 0) {
    long long N;
    cin >> N;
    vector<long long> e(N);
    for (long long i = 0; i < (N); ++i) {
      cin >> e[i];
    }
    sort((e).begin(), (e).end());
    long long ans = 0;
    long long temp = 0;
    for (long long i = 0; i < (N); ++i) {
      temp++;
      if (e[i] <= temp) {
        ans++;
        temp = 0;
      }
    }
    cout << ans << endl;
  }
}
