#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int getrnd(int l, int r) { return uniform_int_distribution<int>(l, r)(rng); }
template <typename T1, typename T2>
bool relax(T1& a, const T2& b) {
  if (a > b) {
    a = b;
    return 1;
  }
  return 0;
}
template <typename T1, typename T2>
bool strain(T1& a, const T2& b) {
  if (a < b) {
    a = b;
    return 1;
  }
  return 0;
}
void solve() {
  ll n, x, a, b;
  cin >> n >> x >> a >> b;
  cout << min(n - 1, abs(a - b) + x) << '\n';
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(nullptr);
  cout.tie(nullptr);
  srand(time(0));
  int t = 1;
  cin >> t;
  while (t--) solve();
  return 0;
}
