#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  cout.tie(nullptr);
  int T;
  cin >> T;
  while (T--) {
    int N;
    cin >> N;
    vector<int> a(N);
    ;
    for (int& x : a) cin >> x;
    int ans = (a[0] == 1);
    for (int i = 1; i < N; ++i) {
      if (a[i] == 0) continue;
      int j = i;
      while (j < N && a[j] == 1) ++j;
      ans += (j - i) / 3;
      i = j - 1;
    }
    cout << ans << '\n';
  }
}
