test(integration): Add a new test case to validate method overriding

integration-tests/tests/fixtures/components.ts

@@ -1,6 +1,7 @@
 import { MedusaMiddleware, MedusaRequest, Middleware, Module, Router, Service } from 'medusa-extender';
 import { default as MedusaCartService } from '@medusajs/medusa/dist/services/cart';
 import { Response, Request, NextFunction } from 'express';
+import { Cart } from "@medusajs/medusa/dist/models/cart";
 
 @Service()
 export class TestService {
@@ -12,6 +13,10 @@ export class CartService extends MedusaCartService {
 	static resolutionKey = 'cartService';
 
 	customMethod = jest.fn();
+
+	removeLineItem(cartId: string, lineItemId: string): Promise<Cart> {
+		return Promise.resolve({ id: "cart_dafsdgfds" } as Cart)
+	}
 }
 
 @Router({
@@ -208,7 +213,7 @@ CustomTopTestPathMiddleware.prototype.consume = jest
 		StoreRouter,
 		StoreTestPathMiddleware,
 		CustomTopRouter,
-		CustomTopTestPathMiddleware
+		CustomTopTestPathMiddleware,
 	],
 })
 export class TestModule {}

integration-tests/tests/integration.spec.ts

@@ -103,6 +103,18 @@ describe('Medusa-extender', () => {
 
 			expect(cartService.customMethod).toHaveBeenCalled();
 		});
+
+		it('should load overridden service components and override parent method', async () => {
+			const cartService: CartService = context.container.resolve(CartService.resolutionKey);
+
+			const cart = await cartService.removeLineItem("1", "1");
+
+			expect(cart).toEqual(
+				expect.objectContaining({
+					id: "cart_dafsdgfds"
+				})
+			);
+		});
 	});
 
 	describe('admin api loader', () => {