import nock from 'nock'; import sinon from 'sinon'; import { getStorageItem, setStorageItem } from './storage-helpers'; jest.mock('./storage-helpers.js', () => ({ getStorageItem: jest.fn(), setStorageItem: jest.fn(), })); const fetchWithCache = require('./fetch-with-cache').default; describe('Fetch with cache', () => { afterEach(() => { sinon.restore(); nock.cleanAll(); }); it('fetches a url', async () => { nock('https://fetchwithcache.metamask.io') .get('/price') .reply(200, '{"average": 1}'); const response = await fetchWithCache( 'https://fetchwithcache.metamask.io/price', ); expect(response).toStrictEqual({ average: 1, }); }); it('returns cached response', async () => { nock('https://fetchwithcache.metamask.io') .get('/price') .reply(200, '{"average": 2}'); getStorageItem.mockReturnValueOnce({ cachedResponse: { average: 1 }, cachedTime: Date.now(), }); const response = await fetchWithCache( 'https://fetchwithcache.metamask.io/price', ); expect(response).toStrictEqual({ average: 1, }); }); it('fetches URL again after cache refresh time has passed', async () => { nock('https://fetchwithcache.metamask.io') .get('/price') .reply(200, '{"average": 3}'); getStorageItem.mockReturnValueOnce({ cachedResponse: { average: 1 }, cachedTime: Date.now() - 1000, }); const response = await fetchWithCache( 'https://fetchwithcache.metamask.io/price', {}, { cacheRefreshTime: 123 }, ); expect(response).toStrictEqual({ average: 3, }); }); it('should abort the request when the custom timeout is hit', async () => { nock('https://fetchwithcache.metamask.io') .get('/price') .delay(100) .reply(200, '{"average": 4}'); await expect(() => fetchWithCache( 'https://fetchwithcache.metamask.io/price', {}, { timeout: 20 }, ), ).rejects.toThrow({ name: 'AbortError', message: 'The user aborted a request.', }); }); it('throws when the response is unsuccessful', async () => { nock('https://fetchwithcache.metamask.io') .get('/price') .reply(500, '{"average": 6}'); await expect(() => fetchWithCache('https://fetchwithcache.metamask.io/price'), ).rejects.toThrow(''); }); it('throws when a POST request is attempted', async () => { nock('https://fetchwithcache.metamask.io') .post('/price') .reply(200, '{"average": 7}'); await expect(() => fetchWithCache('https://fetchwithcache.metamask.io/price', { method: 'POST', }), ).rejects.toThrow(''); }); it('throws when the request has a truthy body', async () => { nock('https://fetchwithcache.metamask.io') .get('/price') .reply(200, '{"average": 8}'); await expect(() => fetchWithCache('https://fetchwithcache.metamask.io/price', { body: 1 }), ).rejects.toThrow(''); }); it('throws when the request has an invalid Content-Type header', async () => { nock('https://fetchwithcache.metamask.io') .get('/price') .reply(200, '{"average": 9}'); await expect(() => fetchWithCache('https://fetchwithcache.metamask.io/price', { headers: { 'Content-Type': 'text/plain' }, }), ).rejects.toThrow({ message: 'fetchWithCache only supports JSON responses', }); }); it('should correctly cache responses from interwoven requests', async () => { nock('https://fetchwithcache.metamask.io') .get('/foo') .reply(200, '{"average": 9}'); nock('https://fetchwithcache.metamask.io') .get('/bar') .reply(200, '{"average": 9}'); const testCache = {}; getStorageItem.mockImplementation((key) => testCache[key]); setStorageItem.mockImplementation((key, value) => { testCache[key] = value; }); await Promise.all([ fetchWithCache( 'https://fetchwithcache.metamask.io/foo', {}, { cacheRefreshTime: 123 }, ), fetchWithCache( 'https://fetchwithcache.metamask.io/bar', {}, { cacheRefreshTime: 123 }, ), ]); expect( testCache['cachedFetch:https://fetchwithcache.metamask.io/foo'] .cachedResponse, ).toStrictEqual({ average: 9 }); expect( testCache['cachedFetch:https://fetchwithcache.metamask.io/bar'] .cachedResponse, ).toStrictEqual({ average: 9 }); }); });