Jest 26 Mock Window Location

mockWindowLocation.ts

// Jest 26 with latest JSDOM prevents location from being proxied
// Instead we can redefine location on window, and then restore.
export function mockWindowLocation(
  mockLocation: Partial<Location> = {
    href: '',
    assign: jest.fn(),
    reload: jest.fn(),
  }
) {
  const savedLocation = window.location;
  
  beforeEach(() => {
    Object.defineProperty(window, 'location', {
      writable: true,
      value: mockLocation,
    });
  });

  afterEach(() => {
    window.location = savedLocation;
  });

  return (mockLocation: Partial<Location>) => {
    Object.defineProperty(window, 'location', {
      writable: true,
      value: mockLocation,
    });
  };
}