#include <iostream>
#include <vector>
#include <algorithm>

#define c_boost std::ios_base::sync_with_stdio(false); std::cin.tie(nullptr)

using namespace std;
using LL = long long;
const LL mod = 10e9 + 7;

// @author: Danielto1404

void solve() {
    int n, x, a, b;
    cin >> n >> x >> a >> b;
    if (a > b) swap(a, b);
    int a_to_begin = a - 1;
    int b_to_end = n - b;
    if (a_to_begin + b_to_end <= x) {
        cout << n - 1;
    } else {
        cout << b - a + x;
    }
    cout << '\n';

}

int main() {
    c_boost;
    int t;
    cin >> t;
    while (t--)
        solve();
}