How to stub process.env in Node.js?

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To stub process.env in Node.js, we set the values in our test.

For instance, we write

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

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

to set the process.env.NODE_ENV to 'test' in our test.

And we delete the property in the afterEach callback so it’s removed after each test.

By John Au-Yeung