These tests happened. Most experts suspect that their success rates were far below claimed outcomes. But the important question is can you put the bomb on a weapon, launch it, and detonate it at the target. I think probably not very successfully. I also suspect they’re not stockpiling these things as claimed.

I also don’t think it matters because they would be pretty dumb to use them. I’m of the mindset that they will most likely simply collapse at some point and the nukes will become unmaintained and useless.