I don't think they're missing it. It's a bad idea and you can have your own valid certificate for free from many companies. Or for test, you can create your own cert in 2 lines of bash. (and add the ca to trusted store, so it's just as valid as this one)
For testing purposes you can also generate your certs valid only for a few hours/days, so you can be sure they never get used in production by accident. And with proper SAN entries.