Mock window.location in Jest

Mocking or writing over global objects in Jest might result in side effects that stays throughout the tests that are run from the same file.

In other words, test A might addEventListener to the window object and test B will be affected with the same event listeners. Here's how to safely writing over global objects in Jest through beforeEach.

describe("Module", () => {
  const { location } = window;
  beforeAll(() => {
    delete window.location;
    window.location = {};

    Object.defineProperty(window.location, "href", {
      get: getHref,
      set: setHref,

  afterAll(() => {
    window.location = location;

  it("redirects to another URL", () => {
    window.location.href = "";

  it("reads from window.location", () => {

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