Master modern JavaScript testing frameworks.
Write reliable tests for your applications.
Jest Basics
describe(‘Calculator’, () => {
test(‘adds numbers’, () => {
expect(add(2, 3)).toBe(5);
});
});
Mocking
jest.mock(‘./api’);
test(‘fetches data’, async () => {
await expect(fetchData()).resolves.toBe(‘data’);
});
Vitest (Modern Alternative)
import { test, expect } from ‘vitest’;
test(‘math’, () => {
expect(1 + 1).toBe(2);
});
Conclusion
Testing ensures code quality and reliability!