React Testing Workshop

👋 hi there! My name is Kent C. Dodds! This is a workshop repo to teach you about increasing your deploy confidence by using Jest and React Testing Library to test your react components.

System Requirements

• git v2 or greater
• NodeJS v8 or greater
• [yarn][yarn] v1 or greater (or npm v6 or greater)

All of these must be available in your PATH. To verify things are set up properly, you can run this:

git --version
node --version
yarn --version # or npm --version

If you have trouble with any of these, learn more about the PATH environment variable and how to fix it here for windows or mac/linux.

Setup

After you've made sure to have the correct things (and versions) installed, you should be able to just run a few commands to get set up:

git clone https://github.com/kentcdodds/react-testing-workshop.git
cd react-testing-workshop
npm run setup --silent

This may take a few minutes. It will ask you for your email. This is optional and just automatically adds your email to the links in the project to make filling out some forms easier If you get any errors, please read through them and see if you can find out what the problem is. You may also want to look at Troubleshooting. If you can't work it out on your own then please file an issue and provide all the output from the commands you ran (even if it's a lot).

Running the app

To get the app up and running (and really see if it worked), run:

npm start

This should start up your browser. If you're familiar, this is a standard react-scripts application.

You can also open the deployment of the app on Netlify.

At the top of each file in the components directory is a link to the URL you can visit to open the component in the browser.

Running the tests

npm test

This will start Jest in watch mode. Read the output and play around with it.

Your goal will be to go into each test in the exercises directory and follow the instructions to test the component

Helpful Emoji 🐨 💰 💯 🦉 📜

Each exercise has comments in it to help you get through the exercise. Kody the Koala Bear, Marty the Money Bag, Hannah the Hundred, Olivia the Owl, and Dominic the Document are here to help you.

• Kody 🐨 will tell you when there's something specific you should do
• Marty 💰 will give you specific tips (and sometimes code) along the way
• Hannah 💯 will give you extra challenges you can do if you finish the exercises early.
• Olivia 🦉 will give you useful tidbits/best practice notes.
• Dominic 📜 will give you links to useful documentation

Troubleshooting

"npm run setup" command not working

Here's what the setup script does. If it fails, try doing each of these things individually yourself:

# verify your environment will work with the project
node ./scripts/verify

# install dependencies
npm install

# verify the project is ready to run
npm run lint
npm run test:coverage
npm run build

If any of those scripts fail, please try to work out what went wrong by the error message you get. If you still can't work it out, feel free to open an issue with all the output from that script. I will try to help if I can.

Contributors

Thanks goes to these wonderful people (emoji key):

Kent C. Dodds 💻 📖 🚇 ⚠️	FWeinb 🐛 🤔	David Lannoye 🐛 📖	Colin Cummings 💻 ⚠️	Benji Koltai 📖	Sumit Bagga 📖	Yury Tarabanko 💻
Alex Wendte 💻

This project follows the all-contributors specification. Contributions of any kind welcome!

License

This material is available for private, non-commercial use under the GPL version 3. If you would like to use this material to conduct your own workshop, please contact me at kent@doddsfamily.us