JavaScript Unit Testing using Jest

Tools:

• Visual Studio Code
  
• Node JS
  
• A guide to unit testing in JS

devDependencies:

• jest

Commands:

npm init -y

npm i -D jest

npm test

---

// functions.js > to check test x PASS

const functions = {
  add: (num1, num2) => num1 + num2
};

module.exports = functions;

// functions.js > to check test x FAIL

const functions = {
  add: (num1, num2) => num1 + num2 + 1
};

module.exports = functions;