Dvc: test: migrate from unittest to pytest

[efiop]

Need to stop using unittest's TestCase and use pytest instead.

[Suor]

Should we raise this in priority?

Also, looks like we have 3 parts here:

• [ ] migrate test_data_cloud.py, look at tests/remotes.py
• [ ] migrate external dep tests
• [ ] migrate all other unit tests

[efiop]

@Suor This one is still nice-to-have, but it doesn't mean that we can't take it 🙂 Considering the data_cloud complications, I suspect that it will take a bit longer to resolve this one, so I would take it after we migrate to new fixtures. Let's not add this one to the sprint for now.

[Suor]

Maybe open a free hunt on it? @efiop @mroutis @pared @skshetry?

[efiop]

@Suor Let's not do that in this sprint for now, let's deal with what we have for now. Could consider including into the next one though, let's discuss on grooming.

[efiop]

Migrating tests/func/test_data_cloud.py