#include <bits/stdc++.h>
using namespace std;
int t, n;
int hmz, hmbz, bsz = -100000, sum;
int main() {
  cin >> t;
  for (; t; t--) {
    cin >> n;
    hmz = 0;
    hmbz = 0;
    bsz = -100000;
    sum = 0;
    for (int i = 1; i <= n; i++) {
      int x;
      cin >> x;
      if (x == 0)
        hmz++;
      else if (x < 0)
        bsz = max(bsz, x);
      else
        hmbz++;
      sum += x;
    }
    int sol = 0;
    if (hmz) sum += hmz, sol += hmz;
    if (sum == 0) {
      if (hmbz)
        sol++;
      else
        sol += (1 - hmbz);
    }
    cout << sol << '\n';
  }
  return 0;
}
