Unit Test Activity using Jest

unit_test_activity.md

Unit Test Activity with Jest

Objective

Write a simple function that takes two numbers as arguments and multiplies them with 100% test coverage using TDD

Steps

1. Create a new directory called calculator-app and cd into it
2. Set up your git repo correctly with the proper npm entries in .gitignore
3. Create a new project with npm init
4. Install thejest project into your node development dependencies
5. In your package.json file, create a script that runs jest for the script command
6. In the root of your app, create a test file called multiplyStuff.test.js
7. In your test file, import the not-yet-created file multiplyStuff.js
8. In your test file, write a test that expects the multiplyStuff function to return the product of two arguments
9. Run your test with npm run test (It should fail)
10. Create a file called multiplyStuff.js
11. Write the code (remember module.exports) to make the test pass!