Please, please DO NOT test a nuclear weapon. The world will be far better off if everyones nuclear weapon turned out to be a dud.
I know anyone alive today, not suffering from a mental illness, that would accept their leaders starting a global nuclear war.
Mind you, that's not a majority of the actual population given how low voter turnout is, but that's enough to be really scary.
The reality of our situation if that we will keep fighting each other, that's a given. Best to test our nukes to make sure they work. Nukes that won't work can't save lives.