Dom tests - No actual changes,

.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "pwa-node",
+            "request": "launch",
+            "name": "Debug api",
+            "skipFiles": [
+                "<node_internals>/**"
+            ],
+            "runtimeArgs": ["-r","ts-node/register","-r","tsconfig-paths/register"],
+            "console": "integratedTerminal",
+            "program": "${workspaceFolder}\\apps\\api\\src\\app\\discounts\\discount.controller.spec.ts",
+            "outFiles": [
+                "${workspaceFolder}/**/*.js"
+            ]
+        }
+    ]
+}

apps/api/src/app/discounts/discount.controller.spec.ts

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+/* eslint-disable @typescript-eslint/explicit-function-return-type */
+import { Test, TestingModule } from '@nestjs/testing';
+import { Console } from 'console';
+import { of } from 'rxjs';
+import { discounts } from './discounts.constant';
+import { DiscountsController as Controller } from './discounts.controller';
+import { DiscountsService as Service } from './discounts.service';
+
+describe('Discount Controller', () => {
+  // Reference variables used for spying
+  let app: TestingModule;
+  let controller: Controller;
+  let service: Service;
+
+  const discountId = '78c0a432-59f8-4a6c-b89d-57030a6628d9'; // Corresponds to discount[0]
+
+  beforeAll(async () => {
+    app = await Test.createTestingModule({
+      controllers: [Controller],
+      providers: [
+        // Mock of the service and its methods
+        {
+          provide: Service,
+          useFactory: () => ({
+            findAll: jest.fn().mockReturnValue(discounts), // an observale of discount list
+            findOneByCode: jest.fn().mockReturnValue(discounts[0]), // a promise turned into a singular discount item
+          }),
+        },
+      ],
+    }).compile();
+    // Set the references
+    controller = app.get<Controller>(Controller);
+    service = app.get<Service>(Service);
+  });
+
+  it('should be defined', () => {
+    expect(controller).toBeDefined();
+  });
+
+  describe('getAll()', () => {
+    it('should call findAll 1 time"', async () => {
+      jest.spyOn(service, 'findAll');
+
+      await controller.getAll();
+      expect(service.findAll).toHaveBeenCalledTimes(1);
+      expect(service.findAll).toHaveBeenCalledWith();
+    });
+
+    it('should call findAll and receive a list of discounts"', async () => {
+        jest.spyOn(service, 'findAll');
+
+        const response = await controller.getAll();
+        console.log(response)
+        expect(response).toEqual(discounts);
+      });
+
+  });
+
+  describe('get()', ()=>{
+      it('should call findOne 1 time',async () => {
+        jest.spyOn(service, 'findOneByCode');
+
+        await controller.get(discountId);
+        expect(service.findOneByCode).toHaveBeenCalledTimes(1);
+        expect(service.findOneByCode).toHaveBeenCalledWith(discountId);
+      });
+
+      it('should call findOne and receive a single discount"', async () => {
+        jest.spyOn(service, 'findOneByCode');
+
+        const response = await controller.get(discountId);
+        expect(response).toEqual(discounts[0]);
+      });
+
+
+
+  });
+
+});

apps/api/src/app/discounts/discounts.constant.ts

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+import { DiscountTypeEnum, IDiscount } from '@interfaces';
+
+export const discounts: IDiscount[] = [
+  {
+    discountId: '78c0a432-59f8-4a6c-b89d-57030a6628d9',
+    code: 'discount-100',
+    amount: 100,
+    type: DiscountTypeEnum.amount,
+    remainingUses: 100,
+    startsAt: new Date('1977-12-26 12:30:00'),
+    isEnabled: true,
+  },
+  {
+    discountId: 'b43eba0f-3a6e-4864-8206-89880e78b4d3',
+    code: 'discount-666666',
+    amount: 666666,
+    type: DiscountTypeEnum.amount,
+    remainingUses: 100,
+    startsAt: new Date('1977-12-26 12:30:00'),
+    isEnabled: true,
+  },
+  {
+    discountId: '2df8ea99-bcf0-47ec-a6b3-388e8a9e3e74',
+    code: 'discount-10-percent',
+    amount: 10,
+    type: DiscountTypeEnum.percentage,
+    remainingUses: 100,
+    startsAt: new Date('2020-3-13 12:30:00'),
+    isEnabled: true,
+  },
+  {
+    discountId: 'a7f0b654-dea1-404c-a725-3e0046c459a4',
+    code: 'discount-100-percent',
+    amount: 100,
+    type: DiscountTypeEnum.percentage,
+    remainingUses: 100,
+    startsAt: new Date('2020-3-13 12:30:00'),
+    isEnabled: true,
+  },
+  {
+    discountId: '1d7d4480-1753-4846-b05d-37fe678256ed',
+    code: 'discount-expired',
+    amount: 100,
+    type: DiscountTypeEnum.amount,
+    remainingUses: 100,
+    startsAt: new Date('2012-12-21 08:30:00'),
+    expiresAt: new Date('2012-12-21 23:59:59'),
+    isEnabled: true,
+  },
+  {
+    discountId: '73b993b4-e793-47cb-89d0-cd1aefed53f6',
+    code: 'discount-not-started',
+    amount: 100,
+    type: DiscountTypeEnum.amount,
+    remainingUses: 100,
+    startsAt: new Date('2112-12-21 21:12:21'),
+    isEnabled: true,
+  },
+  {
+    discountId: '8187f8a3-06c2-4982-ae82-fc547efd27f4',
+    code: 'discount-disabled',
+    amount: 100,
+    type: DiscountTypeEnum.amount,
+    remainingUses: 100,
+    startsAt: new Date('1974-02-08 00:00:01'),
+    isEnabled: false,
+  },
+  {
+    discountId: 'a82a71e7-5012-4b57-8780-c7b598ff99d6',
+    code: 'discount-no-uses',
+    amount: 100,
+    type: DiscountTypeEnum.amount,
+    remainingUses: 0,
+    startsAt: new Date('2022-01-01 10:10:10'),
+    isEnabled: false,
+  },
+];