http.basketRepository.test.ts

describe('Integration | Gateways | Http basket repository', () => {
    const BASE_API_URL = 'https://www.fakeapi.com'
    let httpClient: HTTPClient
    let basketRepository: BasketRepository
    let basket: Basket

    beforeEach(() => {
        httpClient       = {
            get : sinon.stub(),
            post: sinon.stub()
        }
        basketRepository = new HTTPBasketRepository(httpClient)
        basket           = new Basket()
    })

    context('Fetch all books', () => {
        it('Everything is good', async () => {
            basket.add(new Book('book1'))
            httpClient.get.resolves({ basket_items: ['book1'] })

            const result = await basketRepository.getBasket()

            expect(httpClient.get).to.have.been
                .calledOnceWithExactly(`${ BASE_API_URL }/baskets`)
            expect(result).to.eql(basket)
        })

        it('Something is wrong', async () => {
            const error = new Error('error from api')
            httpClient.get.rejects(error)

            try {
                await basketRepository.getBasket()
                fail()
            } catch (e) {
                expect(e).to.eql(error)
            }
        })
    })

    context('Add a book', () => {
        it('Everything is good', async () => {
            basket.add(new Book('book1'))

            await basketRepository.save(basket)

            expect(httpClient.post).to.have.been.calledOnceWithExactly(
                `${ BASE_API_URL }/baskets`,
                { basket_items: ['book1'] }
            )
        })

        it('Something is wrong', async () => {
            basket.add(new Book('book1'))
            const error = new Error('error from api')
            httpClient.post.rejects(error)

            try {
                await basketRepository.save(basket)
                fail()
            } catch (e) {
                expect(e).to.eql(error)
            }
        })
    })
})