[Lio]

I could never warm to MiniTest, even though I want to as it's in the standard lib and I dislike unnecessary dependencies.

I've not checked recently but last time I used it didn't provide colour output without plugins and didn't include verifying doubles or spies out of the box.

There were a lot of other decisions required to make Minitest plesant in non-rails projects.

You can still use dependency injection with Rspec, it's just a nicer experience IMHO.