JavaScript Testing with Jest Testing is crucial for maintaining code quality and preventing bugs. Jest makes JavaScript testing simple and enjoyable. Writing Your First Test Start with a simple unit test: // math.js function add(a, b) { return a + b; } function subtract(a, b) { return a - b; } module.exports = { add, subtract }; // math.test.js const { add, subtract } = require('./math'); describe('Math functions', () => { test('adds 1 + 2 to equal 3', () => { expect(add(1, 2)).toB...
