[Pytest-commit] Issue #292: Negated factor conditions. (hpk42/tox)

[Tai Lee]

New issue 292: Negated factor conditions.
https://bitbucket.org/hpk42/tox/issues/292/negated-factor-conditions

Tai Lee:

I'd like to do something like:

```
[testenv]
commands =
    cov: coverage run ... runtests.py
    cov: coveralls
    !cov: python runtests.py
```

Currently I have to declare factor conditions for `cov` and `nocov` instead, which means users must always specific either `cov` or `nocov` with `tox -e`. If they forget, `tox` just reports success without running any command:

```
[testenv]
commands =
    cov: coverage run ... runtests.py
    cov: coveralls
    nocov: python runtests.py
```