[Pytest-commit] Issue #351: deps = {posargs} (hpk42/tox)

[John Vandenberg]

New issue 351: deps = {posargs}
https://bitbucket.org/hpk42/tox/issues/351/deps-posargs

John Vandenberg:

Sometimes it is useful to install a set of packages to alter the behaviour of a test run.

Two cases where I have thought this was useful was with `flake8-putty`, where I install sets of plugins to check my plugin with.

https://github.com/jayvdb/flake8-putty/blob/bac9533cc7fc7854c14657b35d8e07da99d5757f/tox.ini
(obviously I would need to change things a little, adding a new testenv for using {posargs} as requirements instead of as filenames.

The current case is `pyflakes`, where I want to install packages into the venv and then check their syntax.

For `deps = {posargs}`, each positional argument would need to be a complete requirement with environment marker, i.e. any spaces wrapped in `".. "`, and they would need to be added to the `deps` as a separate line for each argument.

`deps = {posargs}` currently crashes on

`tox.ConfigError: ConfigError: substitution key 'posargs' not found`