Hi folks,

Most OpenStack projects use testtools/fixtures/unittest2 for unit tests. It was immensely helpful in Python 2 times, but I wonder if we should migrate away now. I've hit at least these three bugs:
https://github.com/testing-cabal/testtools/issues/235
https://github.com/testing-cabal/testtools/issues/275
https://github.com/testing-cabal/testtools/issues/144

We can invest time in fixing them, but I wonder if we should just migrate to the standard unittest (and move oslotest to it) now that we require Python >= 3.6.

Thoughts?

Dmitry