# cook your dish here
from sys import stdin,stdout
from collections import Counter
from itertools import permutations
import bisect
import math
I=lambda: map(int,stdin.readline().split())
I1=lambda: stdin.readline()

for _ in range(int(I1())):
    n=int(I1())
    l=list(I())
    f=0
    for i in range(0,n-2):
        x,y,z=i,i+1,i+2 
        if(l[x]+l[y]<l[z]):
            f=1
            break
    if f==1: print(x+1,y+1,z+1)
    else: print(-1)