Tests on CI

1. Remove the node --version step from the "Tests" workflow, then we'll implement actual testing.

2. Add this step to the end of our workflow:

- name: Install dependencies
  run: npm ci

Now that we need vitest to run our tests, we need the CI runner to install our dependencies. You're familiar with npm install, npm ci is very similar but stands for "clean-install", and is helpful in automated environments so we can be sure we get a clean install every time.

3. Let's add a step to run your tests. You should run them in exactly the same way as you do locally:

run: npm run test

4. Break your code temporarily. We want to make sure that your CI fails when your tests don't pass. Commit and push the broken code and watch the workflow fail.

You'd be surprised how many times companies I've worked at thought they had CI that was checking for failures, but broken code didn't actually fail the CI. It's important to make sure that your CI is checking for failures.

5. Once you're convinced that the CI properly catches failing tests, fix your code, commit it and push it to GitHub. You should see your CI tests pass on GitHub.

Paste the URL of your GitHub repo into the box and run the GitHub checks.