shlinkio / shlink-web-client

describe('Storage', () => {

  const localStorageMock = {

    getItem: sinon.fake((key) => key === 'shlink.foo' ? JSON.stringify({ foo: 'bar' }) : null),

    setItem: sinon.spy(),

  };

  let storage;

  beforeEach(() => {

    localStorageMock.getItem.resetHistory();

    localStorageMock.setItem.resetHistory();

    storage = new Storage(localStorageMock);

  });

  describe('set', () => {

    it('writes an stringified representation of provided value in local storage', () => {

      const value = { bar: 'baz' };

      storage.set('foo', value);

      expect(localStorageMock.setItem.callCount).toEqual(1);

      expect(localStorageMock.setItem.getCall(0).args).toEqual([

        'shlink.foo',

        JSON.stringify(value),

      ]);

    });

  });

  describe('get', () => {

    it('fetches item from local storage', () => {

      storage.get('foo');

      expect(localStorageMock.getItem.callCount).toEqual(1);

    });

    it('returns parsed value when requested value is found in local storage', () => {

      const value = storage.get('foo');

      expect(value).toEqual({ foo: 'bar' });

    });

    it('returns undefined when requested value is not found in local storage', () => {

      const value = storage.get('bar');

      expect(value).toBeUndefined();

    });

  });

});