#include<bits/stdc++.h>
using namespace std;
int main(){
    int t;
    cin>>t;
    for (int i = 0; i < t; i++)
    {
        int n,m,c=0;
        cin>>n>>m;
        int a[n], b[m];
        for(int j=0;j<n;j++)
        {
            cin>>a[j];
        }
        for(int j=0;j<m;j++)
        {
            cin>>b[j];
        }
        sort(a,a+n);
        sort(b,b+m);
 
        int j=0,k=0;
        while(j<n && k<m)
        {
            if(a[j]==b[k])
            {
                c++;
                j++;
            }
            else if(a[j]<b[k])
            j++;
             else
            k++;
        }
      cout<<c<<endl;       
    }
}

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