chore: refactor package to use a dedicated submodule for the tests

[ccoVeille]

Summary

This allows to simplify the dependencies of the main module

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• Tests are passing: task test
• Code style is correct: task lint

[ccoVeille]

This might be a naive approach, but it would make the package depency free.

I opened because I was surprised to see this PR being opened in testify that uses objx as a dependencies

• deps: fix dependency cycle with objx (again) testify#1567

[geseq]

Nice one. Perhaps we should add a Makefile with test commands for easy testing locally.

[ccoVeille]

Nice one.

@geseq thanks

Perhaps we should add a Makefile with test commands for easy testing locally.

There is a "Makefile" in that project. But it doesn't use make but task

It uses the Taskfile.yaml I'm updating. You can take a look at it.

task is also used by GHA

[dolmen]

I suspect that this new project structure breaks coverage reporting: tested code and tests must be in the same package.

[ccoVeille]

Yes, unfortunately

[ccoVeille]

Based on how much testify is extensively used in test, it won't be possible to replace testify by something else using stdlib.

https://github.com/search?q=repo%3Astretchr%2Fobjx+%2Fassert%5C.%5BA-Z%5D%2F&type=code

I tried to see if it was possible to remove testify dependency from objx, but it won't be possible.

So the way is more in that direction

• Do we need objx dependency? testify#1752