#include <bits/stdc++.h>
#include <vector>
#include <set>
#include <algorithm>
#include <cmath>
typedef unsigned long long ull;
typedef long long ll;

using namespace std;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int q;
    cin >> q;
    //q = 100;
    while(q--)
    {
        int n,x,a,b;
        cin >> n >> x >> a >> b;
        int cur = abs(a-b);
        cout << cur + min(n - 1 - cur,x) << endl;
    }
    return 0;
}