I may have missed what size the tank is. But the larger the tank the more I would say its Likely to blow! Due to the weight.
I had a similar issue with a tank recently and was too scared to even fill it !!! Lol it not the water that bothered me, but the weight of the glass if it blew!
Someone suggested using appoxy resin to repair the damage, which would Work on your tank, unfortunately I had serval large chips.
I have seen worse tanks in use, but it always makes me cringe. Not only can you not tell if and when it might blow, but if you ain't there if it does what ever fish you stock with ate a gobbet!!! Which is another reason I didn't repair mine, was to be stocked with expensive frontosa.
Any way good luck with the water test.