[Typescript] Add promotion to basket

Author: Tarcaye

typescript/test/world-company-remuneration/basket-informations.test.ts

@@ -9,7 +9,7 @@ describe("a basket should cost", () => {
     test("1000 otherwise", () => {
         let basketInformations = new BasketInformations();
         basketInformations.resetBasket()
-        basketInformations.addProductToBasket("Toto", 1000)
+        basketInformations.addProductToBasket("Toto", 1000) // Promo = false
         expect(basketInformations.getBasketPrice(false)).toBe(1000);
     });