#include <bits/stdc++.h>
using namespace std;
long long int n, m, ar[100005], sum, t;
int main() {
  cin.tie(0);
  cout.tie(0);
  ios_base::sync_with_stdio(false);
  cin >> t;
  while (t--) {
    cin >> n;
    for (int i = 1; i <= n; i++) cin >> ar[i];
    if (ar[1] < ar[n] - ar[n - 1]) {
      cout << 1 << " " << n - 1 << " " << n << endl;
      continue;
    }
    if (ar[1] + ar[2] < ar[n]) {
      cout << 1 << " " << 2 << " " << n << endl;
      continue;
    }
    cout << -1 << endl;
  }
}
