#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int Mod=1e9+7;
const ll INF = 10000000000000;
const int N = 1e6+7;
 
void solve() {
    int n;
    cin >> n;
    vector<int>a(n);
    for(int i=0;i<n;i++) cin >> a[i];
    int cnt = 0;
    int last = -2; 
    for(int i=0;i<n;i++){
      if(a[i] > last + 1){
          cnt++;
          last = a[i];
           }
    }
  cout << cnt << "\n";
}       
 
int main(){ 
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
 
    int t;
    cin >> t;
    while (t--) solve();
 
 
    return 0;
}
 

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