add test-cicd code

code/sample-nodejs-app/Dockerfile

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+# Build stage
+FROM node:18-slim AS builder
+WORKDIR /app
+COPY package*.json ./
+RUN npm install
+COPY . .
+
+# Production stage
+FROM node:18-slim
+WORKDIR /app
+COPY --from=builder /app/package*.json ./
+COPY --from=builder /app/node_modules ./node_modules
+COPY --from=builder /app/index.js ./
+
+EXPOSE 3000
+CMD ["node", "index.js"]

code/sample-nodejs-app/Jenkinsfile

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+pipeline {
+    agent any
+
+    environment {
+        APP_NAME = 'sample-nodejs-app'
+        DOCKER_IMAGE = "test-cicd/${APP_NAME}:${env.BUILD_NUMBER}"
+    }
+
+    stages {
+        stage('Checkout') {
+            steps {
+                checkout scm
+            }
+        }
+
+        stage('Install Dependencies') {
+            steps {
+                dir('code/sample-nodejs-app') {
+                    sh 'npm install'
+                }
+            }
+        }
+
+        stage('Test') {
+            steps {
+                dir('code/sample-nodejs-app') {
+                    sh 'npm test'
+                }
+            }
+        }
+
+        stage('Build Docker Image') {
+            steps {
+                dir('code/sample-nodejs-app') {
+                    sh "docker build -t ${APP_NAME}:latest ."
+                }
+            }
+        }
+
+        stage('Push to Registry') {
+            steps {
+                echo 'Pushing image to registry...'
+                // sh "docker tag ${APP_NAME}:latest ${DOCKER_IMAGE}"
+                // sh "docker push ${DOCKER_IMAGE}"
+            }
+        }
+
+        stage('Deploy to K8s') {
+            steps {
+                echo 'Deploying to Kubernetes...'
+                // sh "kubectl set image deployment/${APP_NAME} ${APP_NAME}=${DOCKER_IMAGE}"
+            }
+        }
+    }
+
+    post {
+        always {
+            cleanWs()
+        }
+        success {
+            echo 'Pipeline completed successfully!'
+        }
+        failure {
+            echo 'Pipeline failed!'
+        }
+    }
+}

code/sample-nodejs-app/index.js

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+const express = require('express');
+const app = express();
+const port = process.env.PORT || 3000;
+
+app.get('/', (req, res) => {
+  res.json({
+    message: 'Hello World from Antigravity!',
+    status: 'success',
+    timestamp: new Date().toISOString()
+  });
+});
+
+app.get('/health', (req, res) => {
+  res.status(200).send('OK');
+});
+
+if (require.main === module) {
+  app.listen(port, () => {
+    console.log(`Server is running on port ${port}`);
+  });
+}
+
+module.exports = app;

code/sample-nodejs-app/package.json

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+{
+  "name": "sample-nodejs-app",
+  "version": "1.0.0",
+  "description": "A sample Node.js app for CI/CD demonstration",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js",
+    "test": "jest"
+  },
+  "dependencies": {
+    "express": "^4.18.2"
+  },
+  "devDependencies": {
+    "jest": "^29.5.0",
+    "supertest": "^6.3.3"
+  }
+}

code/sample-nodejs-app/test/app.test.js

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+const request = require('supertest');
+const app = require('../index');
+
+describe('GET /', () => {
+  it('should return 200 OK and a welcome message', async () => {
+    const res = await request(app).get('/');
+    expect(res.statusCode).toEqual(200);
+    expect(res.body).toHaveProperty('message');
+    expect(res.body.message).toContain('Hello World');
+  });
+});
+
+describe('GET /health', () => {
+  it('should return 200 OK', async () => {
+    const res = await request(app).get('/health');
+    expect(res.statusCode).toEqual(200);
+    expect(res.text).toEqual('OK');
+  });
+});