We have some
testing helpers that you can require in your application tests, but yes, they are all based on RSpec that we use in core.
To be clear, RSpec is used in the core and you don’t have to use the same library used by core in your application that uses Solidus.
Still, you’ll eventually require to write similar helpers for Minitest on your own app, and to be honest I don’t know how much effort is required for that, but testing a Solidus storefront is very similar to test any other Rails application, so I suspect it won’t be a huge amount of work.