Backend Testing and Debugging

2.1 Definitions

Backend Testing: The process of testing the server-side components of an application, including database, server, and application logic.

Debugging: The process of identifying and resolving bugs or issues within the code.

2.2 Types of Testing

• Unit Testing
• Integration Testing
• Functional Testing
• Performance Testing
• Security Testing

3.1 Unit Testing

Unit testing focuses on testing individual components or functions to ensure they work as expected.

const add = (a, b) => a + b;
console.log(add(2, 3)); // Output: 5

3.2 Integration Testing

Integration testing evaluates how different modules work together. This is crucial for ensuring data flows correctly between components.

const request = require('supertest');
const app = require('./app');

describe('GET /api/users', () => {
    it('should return user data', async () => {
        const response = await request(app).get('/api/users');
        expect(response.status).toBe(200);
        expect(response.body).toHaveProperty('users');
    });
});

4.1 Logging

Use logging to track the flow of execution and identify issues. Utilize libraries like Winston or Morgan for effective logging.

const logger = require('winston');
logger.info('Server is starting...');
logger.error('An error occurred!');

4.2 Debugging Tools

Debugging tools such as Node.js Inspector and browser developer tools can help identify and fix issues efficiently.