How to make sure enough fonts are installed to display all Unicode characters?

There seem to be almost 150000 characters encoded in the latest version.

No font that I know of covers even 10% of that range. Obviously a huge amount of partial overlap between fonts exist, but likely some of the rarest characters have only a few, or perhaps one, font set that includes it.

How does anyone make sure they have enough font sets installed on their computer to cover all ~150000?

Surely it's not through manual checking of all the code points?

(I couldn't find a clear answer via searching so I hope someone has done this before!)