tox command not running unittests

[peterschutt]

I'm fairly new to using tox in my own projects so I'd have to do some digging to work out a fix, but if I insert an explicitly failing test, the tox command still returns successes. I think it is just building each environment but not running the tests on them.

To Reproduce
See PR #62 which I've made as demonstration that the CI tests pass.

Expected behavior
CI should fail.

[peterschutt]

I'm pretty sure I struggled to work this out with my own libs and just ended up putting the extras=... and the commands=... into the [testenv] section. This is the tox.ini from my template library project:

[tox]
envlist=lint,py38,py39
isolated_build=true

[testenv]
description=Runs pytest tests in each of the py environs
extras=tests
commands=
    pytest --cov={envsitepackagesdir}/penguin

[testenv:lint]
description=Lint project files
extras=lint
commands =
    isort --check --diff .
    black --check --diff .
    flake8 src/ tests/
    mypy src tests

I don't know if that is good or bad practice but it ends up running linting on the environment python and unittests on the two specified python versions.

[MikeWooster]

Many thanks. I'll take a look and see if I can fix this and #61

[MikeWooster]

fixed in #64