DDD Example - use case test

ddd-example-usecase-test.js

import { articleTestFactory } from '~/domain/article';
import { shoppingCartTestFactory, itemTestFactory } from '~/domain/shoppingCart';
import { InMemoryShoppingCartRepository } from '~/infrastructure/InMemoryShoppingCartRepository';
import { InMemoryArticleRepository } from '~/infrastructure/InMemoryArticleRepository';

describe('addArticleToCart', () => {
  it('should update, persist and return the cart with a new article', async () => {
    // Arrange
    const shoppingCartRepository = new InMemoryShoppingCartRepository();
    const shoppingCart = shoppingCartTestFactory({items: []})
    shoppingCartRepository.store(shoppingCart);

    const articleRepository = new InMemoryArticleRepository();
    const article = articleTestFactory();
    articleRepository.store(article);

    // Act
    const newShoppingCart = await addArticleToCart(
      {
        shoppingCartRepository,
        articleRepository
        shoppingCartId: shoppingCart.id,
        articleId: article.id,
        quantity: 1,
      },
    );

    // Assert
    const expectedShoppingCart = shoppingCartTestFactory({
      items: [itemTestFactory({ article, quantity: 1 })],
    });

    expect(newShoppingCart).toEqual(expectedShoppingCart);

    expect(
      await shoppingCartRepository.findById(shoppingCart.id),
    ).toEqual(expectedShoppingCart);
  });
});