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

How to quickly mock process.env during unit testing.

https://glebbahmutov.com/blog/mocking-process-env/

const sinon = require('sinon')
let sandbox = sinon.createSandbox()

beforeEach(() => {
  sandbox.stub(process.env, 'USER').value('test-user')
})

it('has expected user', () => {
  assert(process.env.USER === 'test-user', 'wrong user')
})

afterEach(() => {
  sandbox.restore()
})

But what about properties that might not exist in process.env before the test? You can use the following package and then you will be able to test the not exist env variables.

https://github.com/bahmutov/mocked-env