Conversation so far:
where does north korea test its nuclear weapons
Punggye-ri Nuclear Test Site was the only known nuclear test site of North Korea.
Where does France test its nuclear weapons?
France's TN 75 first full-yield test was probably the 110 kt detonation on 1 October 1995 at Fangataufa.
why are nuclear weapons tests done
Nuclear weapons tests are experiments carried out to determine the effectiveness, yield, and explosive capability of nuclear weapons.

Question: can you tell me more reasons
Self-contained rewrite: can you tell me more reasons nuclear weapons tests are done