#include <bits/stdc++.h>   using namespace std;   int main() {     long long int t, n, d, x, y, javab1, javab2, ans[1000];     cin >> t;     for (int i = 0; i < t; i++) {       cin >> n >> x >> y >> d;       javab1 = javab2 = n;       if ((y - x) % d == 0) {         ans[i] = ((abs(y - x)) / d);       } else if ((y - 1) % d == 0 || (n - y) % d == 0) {         if ((n - y) % d == 0) {           javab1 = (n - x + d - 1) / d;           javab1 += (n - y) / d;         }         if ((y - 1) % d == 0) {           javab2 = (x - 1 + d - 1) / d;           javab2 += (y - 1) / d;         }         ans[i] = (min(javab2, javab1));       } else {         ans[i] = -1;       }     }     for (int i = 0; i < t; i++) {       cout << ans[i] << endl;     }     return 0;   }   