Integrate with upcoming munit v1

[armanbilge]

Opening the issue to kick things off, munit v1 is still in the milestone stage.
https://github.com/scalameta/munit/releases/tag/v1.0.0-M1

The most notable changes (so far) are that it now supports async suite-local Fixtures 🎉 . Much gratitude to @danicheg for PRing this 👏

My biggest question is: for how long do we still intend to support both CE2 and CE3? Since we are bumping version numbers anyway, I'd be happy to use this opportunity to dump CE2 and the acrobatics this repo uses to share code between them.

[mpilquist]

I think we should support munit 1 + ce2 as there are a lot of projects (fs2 2.5.x included) that depend on munit and we shouldn't strand them on a 0.x release.

[armanbilge]

@mpilquist 6 months later, do you still feel the same?

We will shortly be removing http4s 0.22.x from Steward. Meanwhile, I discovered the other day that fs2 2.5.x CI probably hasn't worked for months.

@valencik had the excellent suggestion to look at download stats. Here they are for the CE2 and CE3 versions, don't be fooled by the colors! :)

The majority of the CE2 users have not updated since 1.0.0, which suggests those projects are not actively maintained. Meanwhile, the majority of the CE3 users are on the latest release.

[mpilquist]

No strong opinions here.

[otto-dev]

FYI https://scalameta.org/munit/docs/fixtures.html#asynchronous-fixtures-with-custom-effect-type

Edit: I had a look if the new functionality allows me to migrate away from munit-cats-effect, but I had little success in doing so. The new functionality is very limited.

[armanbilge]

Another nail in the coffin.

• Release v2.5.5 and EOL 2.x? cats-effect#2988