spec/frontend/helpers/local_storage_helper_spec.js


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import { useLocalStorageSpy } from './local_storage_helper';

describe('block before helper is installed', () => {
  it('should leave original localStorage intact', () => {
    expect(localStorage.getItem).toEqual(expect.any(Function));
    expect(jest.isMockFunction(localStorage.getItem)).toBe(false);
  });
});

describe('localStorage helper', () => {
  useLocalStorageSpy();

  it('mocks localStorage but works exactly like original localStorage', () => {
    localStorage.setItem('test', 'testing');
    localStorage.setItem('test2', 'testing');

    expect(localStorage.getItem('test')).toBe('testing');

    localStorage.removeItem('test', 'testing');

    expect(localStorage.getItem('test')).toBe(null);
    expect(localStorage.getItem('test2')).toBe('testing');

    localStorage.clear();

    expect(localStorage.getItem('test2')).toBe(null);
  });
});