🧪 Tests: Add end-to-end tests?

[JoshuaKGoldberg]

Overview

There've been a bunch of (excellent) issues filed by @rubiesonthesky (e.g. #1498) as a result of running TypeStat on this repo. Which indicates there's not enough test coverage to exercise TypeStat on larger repos such as itself.

Proposal: how about adding some end-to-end tests that truly run TypeStat -not just the existing "mutation" (integration-style) tests- on full repositories?

• TypeStat itself?
• A few small example repos of various styles (JS, mixed-JS-TS, TS)
• Perhaps as a followup: cloning known good repos at particular commits and running on them?

This would come after #1476.

[rubiesonthesky]

Yeah, I totally think this is good thing!

[rubiesonthesky]

We also need some test that running clip works after building to ensure we do not release anything broken.

In short, something that launch typestat and checks that it prints at least the first question.

In the “bin” PR , I changed build workflow so that it launches the cli. But there is nothing to check that it actually prints anything meaningful.