parina bal

#include<cstdio>
#include<iostream>
#include<cstring>
using namespace std;
int main(){
    int t,n,i,j,count=0;
    char ara[1000];
    scanf("%d",&t);
    while(t--){
        scanf("%d",&n);
        scanf("%s",ara[i]);
        for(i=0;i<n;i++){
            if(strcmp(ara,"1")==0) ara[i+1]=ara[i-1]=1;
        }
        for(i=0;i<n;i++){
            if(strcmp(ara,"0")==0) count++;
        }
        printf("%d\n",count);
    }
    return 0;
}