shlinkio / shlink-web-client

import Storage from '../../../src/utils/services/Storage';

describe('Storage', () => {

  const localStorageMock = {

    setItem: jest.fn(),

  };

  let storage;

  beforeEach(() => {

    localStorageMock.getItem.mockClear();

    localStorageMock.setItem.mockReset();

    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).toHaveBeenCalledTimes(1);

      expect(localStorageMock.setItem).toHaveBeenCalledWith('shlink.foo', JSON.stringify(value));

    });

  });

  describe('get', () => {

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

      storage.get('foo');

      expect(localStorageMock.getItem).toHaveBeenCalledTimes(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();

    });

  });

});