t = int(input())
for _ in range(t):
    n = int(input())
    a = list(map(int, input().split()))
    if a[0] + a[1] > a[-1] and a[1] + a[-1] > a[0] and a[0] + a[-1] > a[1]:
        print(-1)
    else:
        print(0, 1, n - 1)