Added Tests

[lydiadunning]

Description

Here's an update containing the changes I made with @MikeBLambert's help during office hours, as well as some additional tests specifically added to test input validation in the AddItem component, and a demonstration of unit testing just to be thorough. Also added some documentation about tests in the test and e2e folders

Added tests are not complete, but are representative of the kinds of tests that can be run on this project. See if you can use the structure here as a starting point to create new tests.

I made a few changes to AddItem.jsx and App.jsx to improve testability. Specifically, making the addItem function from firebase.js a prop allowed me to pass in a placeholder function, and only passing the names of items simplified test data.

One odd change that shouldn't get lost in all this text is that the app's package.json no longer has type: module. That property blocked the playwright tests.

Type of Changes

	Type
	🐛 Bug fix
	✨ New feature
	🔨 Refactoring
✓	💯 Add tests
✓	🔗 Update dependencies
✓	📜 Docs

Testing Steps / QA Criteria

Make sure the app still works

1. Launch the demo- verify it starts
2. Interact with the demo, verify it behaves normally

Try out Tests - Optional

1. Pull down the build. Install dependencies.
2. Try running all Vitest tests by entering npm run test in the terminal. Not all tests should pass. Verify that the testing process completes.
3. Try running all Playwright tests by entering 'npm run e2e' in the terminal. Verify that the testing process completes.

Proofread Documentation - Optional

1. Look at the README.md files in both the test and e2e folders.
2. Try following the directions written there to see if they produce the expected results.

[github-actions]

Visit the preview URL for this PR (updated for commit 5863ec0):

https://tcl-65-smart-shopping-list--pr33-add-tests-01ogv17z.web.app

_{(expires Wed, 04 Oct 2023 16:12:41 GMT)}

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[shannonerhea]

Love the README files. This branch has conflicts once fixed we can merge :)