NodeJs — Testing with Jest

Testing is essential to ensure code quality and prevent bugs. Jest is a popular testing framework for Node.js that allows you to write unit and integration tests easily.

npm install jest --save-dev

// sum.js
function sum(a, b) {
  return a + b;
}
module.exports = sum;

// sum.test.js
const sum = require('./sum');

test('adds 1 + 2 to equal 3', () => {
  expect(sum(1, 2)).toBe(3);
});