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

From my understanding of process.env, you can simply treat it like any other variable when setting its properties. Keep in mind, though, that every value in process.env must be a string. So, if you need a particular value in your test:

   it('does something interesting', () => {
      process.env.NODE_ENV = 'test';
      // ...
   });

To avoid leaking state into other tests, be sure to reset the variable to its original value or delete it altogether:

   afterEach(() => {
       delete process.env.NODE_ENV;
   });