No one does it any more. Invest in better supercomputers and keep accumulating as much material as possible. Nuclear testing is more to flex one's muscle than to really test if those weapons will work. Its not such a big deal - the bomb on Hiroshima was made with fairly low tech back-end and not using computers as we see today.
India must sign the treaty , get as much material as possible
aur jab zarurat hogi testing it - the nuke deal with US may not just be neccessary and they can take back their stuff.
