testing

Testing using Jest and Vitest

• KISS: fail easy to easy debug

• Only test one thing/feature/behaviour (validate input OR transform it)

• Arrange, Act, Assert

• Don't test 3d party code (fetch(), querySelector() ecc..)

npm install vitest --save-dev

in package.json use

• for server testing, default environment node

"scripts": {
    "test": "vitest --run --reporter verbose",
    "test:watch": "vitest"
  },

• for client testing, environment jsdom (jest) happy-dom (vitest)

"scripts": {
    "test": "vitest --run --environment happy-dom"
    },

npm test

https://vitest.dev/

https://vitest.dev/guide/migration.html

https://testing-library.com/