Express com Jest

• npm install express-generator -g
• express myapp
• cd myapp
• npm install
• mkdir js
• cd js

// sum.js function sum(value1, value2) { return value1 + value2; } module.exports = sum;

// test/sum-test.js jest.dontMock('../sum');

describe('sum', function() { it('adds 1 + 2 to equal 3', function() { var sum = require('../sum'); expect(sum(1,2)).toBe(3);
}) });

• npm install jest-cli --save-dev

"scripts": { "test": "jest" }

• npm test -- --watchAll