Beimnet w2 nodejs

assignments/hackyourtemperature/__tests__/app.test.js

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+import app from '../app.js';
+import supertest from 'supertest';
+
+const request = supertest(app);
+
+describe('POST /weather', () => {
+  it('should return 400 if cityName is missing', async () => {
+    const response = await request.post('/weather').send({});
+    expect(response.status).toBe(400);
+    expect(response.body.error).toBe('cityName is required');
+  });
+
+  it('should return 404 if cityName is invalid', async () => {
+    const response = await request
+      .post('/weather')
+      .send({ cityName: 'invalidCity' });
+    expect(response.status).toBe(404);
+    expect(response.body.error).toBe('city not found');
+  });
+
+  it('should return temperature if cityName is valid', async () => {
+    const response = await request
+      .post('/weather')
+      .send({ cityName: 'London' });
+    expect(response.status).toBe(200);
+    expect(response.body.weatherText).toContain('The temperature in London is');
+  });
+});

assignments/hackyourtemperature/app.js

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+import fetch from 'node-fetch';
+
+import express from 'express';
+
+const API_KEY = '5b880f4ee3e43bab62bd1d03019f09c2';
+
+const app = express();
+app.use(express.json());
+
+app.get('/', (req, res) => {
+  res.send('hello from backend to frontend');
+});
+
+app.post('/weather', async (req, res) => {
+  const cityName = req.body.cityName;
+  const url = `http://api.openweathermap.org/data/2.5/weather?q=${cityName}&appid=${API_KEY}&units=metric`;
+  if (!cityName) {
+    return res.status(400).json({ error: 'cityName is required' });
+  }
+  try {
+    const response = await fetch(url);
+    const data = await response.json();
+
+    if (data.status === '404') {
+      return res.status(404).json({ weatherText: 'city is not found' });
+    } else if (!response.ok) {
+      return res.status(response.status).json({ error: 'city not found' });
+    }
+
+    const temperature = data.main.temp;
+
+    res.status(200).json({
+      weatherText: `The temperature in ${cityName} is ${temperature}°C`,
+    });
+  } catch (error) {
+    res.status(500).json({ error: 'server error' });
+  }
+});
+
+export default app;

assignments/hackyourtemperature/babel.config.cjs

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+module.exports = {
+  presets: [
+    [
+      '@babel/preset-env',
+      {
+        targets: {
+          node: 'current',
+        },
+      },
+    ],
+  ],
+};

assignments/hackyourtemperature/jest.config.cjs

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+module.exports = {
+  transform: {
+    '^.+\\.js$': 'babel-jest',
+  },
+  transformIgnorePatterns: [],
+};

assignments/hackyourtemperature/package.json

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+{
+  "name": "hackyourtemperature",
+  "version": "1.0.0",
+  "description": "",
+  "main": "server.js",
+  "scripts": {
+    "test": "jest",
+    "start": "node server.js"
+  },
+  "type": "module",
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^4.21.1",
+    "express-handlers": "^1.0.0",
+    "node-fetch": "^3.3.2",
+    "nodemon": "^3.1.7"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.25.8",
+    "@babel/preset-env": "^7.25.8",
+    "@babel/register": "^7.25.7",
+    "babel-jest": "^29.7.0",
+    "jest": "^29.7.0",
+    "supertest": "^7.0.0"
+  }
+}

assignments/hackyourtemperature/server.js

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+import app from './app.js';
+
+const port = 3000;
+app.listen(port, () => {
+  console.log(`Server is running on http://localhost:${port}`);
+});

assignments/hackyourtemperature/source/key.js

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+export const AIP_KEY = '5b880f4ee3e43bab62bd1d03019f09c2';

package.json

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+{
+  "devDependencies": {
+    "jest": "^29.7.0",
+    "supertest": "^7.0.0"
+  }
+}