Add ability to set environment variables for the process in the AVA config

[sindresorhus]

I'd like to see a config property called environmentVariables that lets the user set environment variables that are injected into the test file processes. I have often needed to set some test-only environment variables, but it's not easy to do this in a cross-platform matter.

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[grnch]

I've found cross-env to be a great solution for cross-platform environment variables in NPM tasks.

Let's say you have some NPM script like this that works only on Linux or Mac:

NODE_ENV=test ava

All you need to do is just slap cross-env in front and you're good to go:

cross-env NODE_ENV=test ava

Now it works on Windows too.

If you've already tried this and it didn't work for you, could you go into more details about your particular setup/workflow?

[sindresorhus]

@grnch I know about cross-env. It's ok, but the commands quickly get messy with it, especially if you need to quote stuff. Using environment variables for tests is a common use-case and AVA can ship with something better built-in.

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