#include <bits/stdc++.h>
using namespace std;
void test(int n, vector<int> arr) {
  for (int i = 0; i < n - 2; i++) {
    if (arr[n - 1] > arr[i] + arr[i + 1]) {
      cout << i << " " << i + 1 << " " << n - 1 << endl;
      return;
    }
  }
  cout << "-1" << endl;
}
int main() {
  int T, n, temp;
  cin >> T;
  for (int i = 0; i < T; i++) {
    cin >> n;
    vector<int> arr;
    for (int j = 0; j < n; j++) {
      cin >> temp;
      arr.push_back(temp);
    }
    test(n, arr);
  }
  return 0;
}
