The goal of this project is to practice testing hooks since they work a bit different than components. The code for this project is identical to the code for our useLocalStorage custom hook project.

1. Testing the following features of the useLocalStorage hook:
   • Ensure the initial value passed to the useLocalStorage hook is stored in localStorage. This should also work with passing a function to useLocalStorage as well.
   • Ensure localStorage is updated whenever setValue is called.
   • Ensure localStorage is cleared whenever setValue is called with undefined.
   • Ensure useLocalStorage uses the value from localStorage if it exists instead of the initial value passed to useLocalStorage.

1. TypeError: Cannot convert undefined or null to object in expect.extend(matchers) setUpTests.js

   • make sure in package.json if you have creatd new Vit + react project or use the project package.json

     "devDependencies": {
         "@testing-library/jest-dom": "^5.16.5", **is this version
         "@testing-library/react": "^14.0.0",
         "@testing-library/user-event": "^14.4.3",
         "@types/react": "^18.0.27",
         "@types/react-dom": "^18.0.10",
         "@vitejs/plugin-react-swc": "^3.0.0",
         "jsdom": "^22.1.0",
         "vite": "^4.1.0",
         "vitest": "^0.32.2" **is this version
     }

To run tests, run the following command

  npm run test

Install my-project with npm

  cd my-project
  npm install