import assert from 'assert' import nock from 'nock' import sinon from 'sinon' import proxyquire from 'proxyquire' const fakeLocalStorageHelpers = {} const fetchWithCache = proxyquire('./fetch-with-cache', { '../../../lib/local-storage-helpers': fakeLocalStorageHelpers, }).default describe('Fetch with cache', function () { beforeEach(function () { fakeLocalStorageHelpers.loadLocalStorageData = sinon.stub() fakeLocalStorageHelpers.saveLocalStorageData = 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.deepEqual(response, { average: 1, }) }) it('returns cached response', async function () { nock('https://fetchwithcache.metamask.io') .get('/price') .reply(200, '{"average": 2}') fakeLocalStorageHelpers.loadLocalStorageData.returns({ 'https://fetchwithcache.metamask.io/price': { cachedResponse: { average: 1 }, cachedTime: Date.now(), }, }) const response = await fetchWithCache('https://fetchwithcache.metamask.io/price') assert.deepEqual(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}') fakeLocalStorageHelpers.loadLocalStorageData.returns({ 'https://fetchwithcache.metamask.io/cached': { cachedResponse: { average: 1 }, cachedTime: Date.now() - 1000, }, }) const response = await fetchWithCache('https://fetchwithcache.metamask.io/price', {}, { cacheRefreshTime: 123 }) assert.deepEqual(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}') try { await fetchWithCache('https://fetchwithcache.metamask.io/price', {}, { timeout: 20 }) assert.fail('Request should be aborted') } catch (e) { assert.deepEqual(e.message, 'Aborted') } }) it('throws when the response is unsuccessful', async function () { nock('https://fetchwithcache.metamask.io') .get('/price') .reply(500, '{"average": 6}') try { await fetchWithCache('https://fetchwithcache.metamask.io/price') assert.fail('Request should throw') } catch (e) { assert.ok(e) } }) it('throws when a POST request is attempted', async function () { nock('https://fetchwithcache.metamask.io') .post('/price') .reply(200, '{"average": 7}') try { await fetchWithCache('https://fetchwithcache.metamask.io/price', { method: 'POST' }) assert.fail('Request should throw') } catch (e) { assert.ok(e) } }) it('throws when the request has a truthy body', async function () { nock('https://fetchwithcache.metamask.io') .get('/price') .reply(200, '{"average": 8}') try { await fetch('https://fetchwithcache.metamask.io/price', { body: 1 }) assert.fail('Request should throw') } catch (e) { assert.ok(e) } }) it('throws when the request has an invalid Content-Type header', async function () { nock('https://fetchwithcache.metamask.io') .get('/price') .reply(200, '{"average": 9}') try { await fetch('https://fetchwithcache.metamask.io/price', { headers: { 'Content-Type': 'text/plain' } }) assert.fail('Request should throw') } catch (e) { assert.ok(e) } }) })