Before buying u cud have checked from inside to see if its cut, slit or punctured before. Outside u cant make out much other than seeing remaining tread life and side wall cut or damage.
Next best test is drive very very very slow in silent road and check for some regular thumping noise or constant bump is repeating. Then check on highway speed and see if its balanced and aligned properly (not pulling on one side, or not vibrating car after 80-90, or not vobbling the car).
If all good, yalla close it