How to stub process.env in node.js?

Question

I want to stub process.env.FOO with bar.

var sinon = require(\'sinon\');
var stub = sinon.stub(process.env, \'FOO\', \'bar\');
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Answer 1

In a spec-helper.coffee or something similar where you set up your sinon sandbox, keep track of the original process.env and restore it after each test, so you don't leak between tests and don't have to remember to reset every time.

_ = require 'lodash'
sinon = require 'sinon'

beforeEach ->
    @originalProcessEnv = _.cloneDeep process.env

afterEach ->
    process.env = _.cloneDeep @originalProcessEnv

In your test, use process.env as normal.

it 'does something based on an env var', ->
    process.env.FOO = 'bar'