Full-Stack Testing Strategies

Common Types of Testing

• Unit Testing
• Integration Testing
• Functional Testing
• End-to-End Testing
• Performance Testing
• Security Testing

A. Unit Testing

Unit testing focuses on individual components and functions. It is typically automated and helps catch issues early in development.

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

B. Integration Testing

Integration testing checks how different parts of the application work together. This can involve testing API endpoints and database interactions.

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

describe('GET /api/users', () => {
    it('responds with json', (done) => {
        request(app)
            .get('/api/users')
            .expect('Content-Type', /json/)
            .expect(200, done);
    });
});

C. End-to-End Testing

End-to-end tests simulate real user scenarios to validate the entire application flow. Tools like Cypress and Selenium are popular for this.

describe('User Login', () => {
    it('should log in successfully', () => {
        cy.visit('/login');
        cy.get('input[name=username]').type('user');
        cy.get('input[name=password]').type('password');
        cy.get('form').submit();
        cy.url().should('include', '/dashboard');
    });
});

Key Best Practices

• Automate tests wherever possible.
• Write tests alongside code.
• Use a CI/CD pipeline to run tests automatically.
• Maintain clear documentation for tests.
• Regularly update tests to account for new features.