# non-degenerate triangle conditions:
# a+b>c
# a+c>b
# b+c>a

t = int(input())
for _ in range(t):
    n = int(input())
    a = [int(i) for i in input().split(" ")]
    i = 0
    j = 1
    k = len(a) - 1
    while j<k:
        if a[i] + a[j] <= a[k]:
            print(i+1, j+1, k+1)
            break
        i+=1
        j+=1
    if j>=k:
        print(-1)