[Fab-user] Isolating env for unittests?

[Chris Spencer]

What's the best way to save and restore env?

I'm trying to unittest some custom Fabric tasks, and I'm having a real problem not-polluting the global env variable. I've tried things like:

     tmp = env.copy()

     ...run test

     env.clear()

     env.update(tmp)

but I still get weird errors caused by left-over env keys from other tests.