basketPriceCalculationSteps.ts

@binding()
export class BasketPriceCalculationSteps {
  private addToBasket: AddToBasket                   = null
  private getBasketInformation: GetBasketInformation = null

  @given(/^A basket that not contains any book$/)
  public givenABasket(): void {
      const basketRepository    = new InMemoryBasketRepository()
      this.addToBasket          = new AddToBasket(basketRepository)
      this.getBasketInformation = new GetBasketInformation(basketRepository)
  }

  @when(/^I add (.*) times the book (.*) into the basket$/)
  public async whenIAddXTimesTheSameBookIntoTheBasket(time: string, bookTitle: string): Promise<void> {
    const book = new Book(bookTitle)
    for (let i = 1; i <= parseInt(time); i++)
      await this.addToBasket.execute(book)
  }

  @when(/^I add those (.*) into the basket$/)
  public async whenIAddSomeBooksIntoTheBasket(books: string): Promise<void> {
    for (const bookTitle of books.split(',')) {
      const book = new Book(bookTitle)
      await this.addToBasket.execute(book)
    }
  }

  @then(/^The price of the basket is (.*)$/)
  public async thenThePriceOfTheBasketIs(basketPrice: string): Promise<void> {
    const basket = await this.getBasketInformation.handle()
    expect(basket.price).to.equals(parseFloat(basketPrice))
  }
}