import * as UserApi from '~/api/user_api'; import UsersCache from '~/lib/utils/users_cache'; describe('UsersCache', () => { const dummyUsername = 'win'; const dummyUserId = 123; const dummyUser = { name: 'has a farm', username: 'farmer', }; const dummyUserStatus = 'my status'; beforeEach(() => { UsersCache.internalStorage = {}; }); describe('get', () => { it('returns undefined for empty cache', () => { expect(UsersCache.internalStorage).toEqual({}); const user = UsersCache.get(dummyUsername); expect(user).toBe(undefined); }); it('returns undefined for missing user', () => { UsersCache.internalStorage['no body'] = 'no data'; const user = UsersCache.get(dummyUsername); expect(user).toBe(undefined); }); it('returns matching user', () => { UsersCache.internalStorage[dummyUsername] = dummyUser; const user = UsersCache.get(dummyUsername); expect(user).toBe(dummyUser); }); }); describe('hasData', () => { it('returns false for empty cache', () => { expect(UsersCache.internalStorage).toEqual({}); expect(UsersCache.hasData(dummyUsername)).toBe(false); }); it('returns false for missing user', () => { UsersCache.internalStorage['no body'] = 'no data'; expect(UsersCache.hasData(dummyUsername)).toBe(false); }); it('returns true for matching user', () => { UsersCache.internalStorage[dummyUsername] = dummyUser; expect(UsersCache.hasData(dummyUsername)).toBe(true); }); }); describe('remove', () => { it('does nothing if cache is empty', () => { expect(UsersCache.internalStorage).toEqual({}); UsersCache.remove(dummyUsername); expect(UsersCache.internalStorage).toEqual({}); }); it('does nothing if cache contains no matching data', () => { UsersCache.internalStorage['no body'] = 'no data'; UsersCache.remove(dummyUsername); expect(UsersCache.internalStorage['no body']).toBe('no data'); }); it('removes matching data', () => { UsersCache.internalStorage[dummyUsername] = dummyUser; UsersCache.remove(dummyUsername); expect(UsersCache.internalStorage).toEqual({}); }); }); describe('retrieve', () => { let apiSpy; beforeEach(() => { jest .spyOn(UserApi, 'getUsers') .mockImplementation((query, options) => apiSpy(query, options)); }); it('stores and returns data from API call if cache is empty', (done) => { apiSpy = (query, options) => { expect(query).toBe(''); expect(options).toEqual({ username: dummyUsername, }); return Promise.resolve({ data: [dummyUser], }); }; UsersCache.retrieve(dummyUsername) .then((user) => { expect(user).toBe(dummyUser); expect(UsersCache.internalStorage[dummyUsername]).toBe(dummyUser); }) .then(done) .catch(done.fail); }); it('returns undefined if Ajax call fails and cache is empty', (done) => { const dummyError = new Error('server exploded'); apiSpy = (query, options) => { expect(query).toBe(''); expect(options).toEqual({ username: dummyUsername, }); return Promise.reject(dummyError); }; UsersCache.retrieve(dummyUsername) .then((user) => done.fail(`Received unexpected user: ${JSON.stringify(user)}`)) .catch((error) => { expect(error).toBe(dummyError); }) .then(done) .catch(done.fail); }); it('makes no Ajax call if matching data exists', (done) => { UsersCache.internalStorage[dummyUsername] = dummyUser; apiSpy = () => done.fail(new Error('expected no Ajax call!')); UsersCache.retrieve(dummyUsername) .then((user) => { expect(user).toBe(dummyUser); }) .then(done) .catch(done.fail); }); }); describe('retrieveById', () => { let apiSpy; beforeEach(() => { jest.spyOn(UserApi, 'getUser').mockImplementation((id) => apiSpy(id)); }); it('stores and returns data from API call if cache is empty', (done) => { apiSpy = (id) => { expect(id).toBe(dummyUserId); return Promise.resolve({ data: dummyUser, }); }; UsersCache.retrieveById(dummyUserId) .then((user) => { expect(user).toBe(dummyUser); expect(UsersCache.internalStorage[dummyUserId]).toBe(dummyUser); }) .then(done) .catch(done.fail); }); it('returns undefined if Ajax call fails and cache is empty', (done) => { const dummyError = new Error('server exploded'); apiSpy = (id) => { expect(id).toBe(dummyUserId); return Promise.reject(dummyError); }; UsersCache.retrieveById(dummyUserId) .then((user) => done.fail(`Received unexpected user: ${JSON.stringify(user)}`)) .catch((error) => { expect(error).toBe(dummyError); }) .then(done) .catch(done.fail); }); it('makes no Ajax call if matching data exists', (done) => { UsersCache.internalStorage[dummyUserId] = dummyUser; apiSpy = () => done.fail(new Error('expected no Ajax call!')); UsersCache.retrieveById(dummyUserId) .then((user) => { expect(user).toBe(dummyUser); }) .then(done) .catch(done.fail); }); }); describe('retrieveStatusById', () => { let apiSpy; beforeEach(() => { jest.spyOn(UserApi, 'getUserStatus').mockImplementation((id) => apiSpy(id)); }); it('stores and returns data from API call if cache is empty', (done) => { apiSpy = (id) => { expect(id).toBe(dummyUserId); return Promise.resolve({ data: dummyUserStatus, }); }; UsersCache.retrieveStatusById(dummyUserId) .then((userStatus) => { expect(userStatus).toBe(dummyUserStatus); expect(UsersCache.internalStorage[dummyUserId].status).toBe(dummyUserStatus); }) .then(done) .catch(done.fail); }); it('returns undefined if Ajax call fails and cache is empty', (done) => { const dummyError = new Error('server exploded'); apiSpy = (id) => { expect(id).toBe(dummyUserId); return Promise.reject(dummyError); }; UsersCache.retrieveStatusById(dummyUserId) .then((userStatus) => done.fail(`Received unexpected user: ${JSON.stringify(userStatus)}`)) .catch((error) => { expect(error).toBe(dummyError); }) .then(done) .catch(done.fail); }); it('makes no Ajax call if matching data exists', (done) => { UsersCache.internalStorage[dummyUserId] = { status: dummyUserStatus, }; apiSpy = () => done.fail(new Error('expected no Ajax call!')); UsersCache.retrieveStatusById(dummyUserId) .then((userStatus) => { expect(userStatus).toBe(dummyUserStatus); }) .then(done) .catch(done.fail); }); }); });