install and use pnpm in the ci pipeline

.github/workflows/main.yaml

@@ -21,11 +21,14 @@ jobs:
         with:
           node-version: 20
 
+      - name: Install PNPM
+        run: npm install -g pnpm
+
       - name: Install Dependencies
-        run: npm install
+        run: pnpm install
 
       - name: Run Tests
-        run: npm test
+        run: pnpm test
 
       - name: Build and Push Docker image
         run: |

src/app.controller.spec.ts

@@ -0,0 +1,22 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { AppController } from './app.controller';
+import { AppService } from './app.service';
+
+describe('AppController', () => {
+  let appController: AppController;
+
+  beforeEach(async () => {
+    const app: TestingModule = await Test.createTestingModule({
+      controllers: [AppController],
+      providers: [AppService],
+    }).compile();
+
+    appController = app.get<AppController>(AppController);
+  });
+
+  describe('root', () => {
+    it('should return { message: "Hello World!"}', () => {
+      expect(appController.getHello()).toEqual('Hello World!');
+    });
+  });
+});