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import Api from '~/api';
import UsersCache from '~/lib/utils/users_cache';
describe('UsersCache', () => {
const dummyUsername = 'win';
const dummyUser = 'has a farm';
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(() => {
spyOn(Api, 'users').and.callFake((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 => 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 = () => fail(new Error('expected no Ajax call!'));
UsersCache.retrieve(dummyUsername)
.then((user) => {
expect(user).toBe(dummyUser);
})
.then(done)
.catch(done.fail);
});
});
});
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