Environment variables containing strings with spaces are not accepted any longer for passenv/pass_env.

[Marc2508]

Looks like this change:
#2658
causes an error for environment variables that are strings:
py3: failed with pass_env values cannot contain whitespace, use comma to have multiple values in a single line, invalid values found '-m "not scale"'

export PYTEST_ARGS = '-m "not scale"'

passenv =
{env:PYTEST_ARGS}

Is this intended?

[mgedmin]

This seems like weird syntax. If you want PYTEST_ARGS to be passed to the commands executed by tox, you would put

pasenv = PYTEST_ARGS

in the tox.ini. Why are you using {env:PYTEST_ARGS}? {env:...} is for including the value of the environment variable into tox configuration.

[gaborbernat]

This seems like a broken configuration where the validation caught it. You're welcome 😊