Remove duplicate test hook and stop removing all environment variables

[dwt]

Closes #25

This fixes the tests in the nixpkgs package.

[jmdaly]

Awesome, thanks so much for the PR! Do you need a new release published for the nixpkgs work?

[afh]

While that would be helpful, @jmdaly, we can make do with this PRs commit patch for the time being, if an ad-hoc release doesn't fit this projects release schedule.

[dwt]

@jmdaly We would greatly appreciate a release though. :)

[jmdaly]

Ok cool, the release schedule is pretty ad hoc, so I'm happy to make a 0.3.1 patch release! Will do that soon 😄

[dwt]

@jmdaly I would appreciate a ping when you do (and this bug would be perfect for that).

[jmdaly]

@dwt Absolutely! I've just released 0.3.1 to PyPi which has your fixes. Thanks again!

[afh]

Thanks so much, @jmdaly, very much appreciated 🙏
The nixpkgs PRs has been updated, is pending review and approval, but should be merged by end of July.

[jmdaly]

That's great, glad to hear it!