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