Add Unit Tests for Library Features

[josnin]

Let's boost our library's reliability! We need unit tests for each feature.

Features to be Tested:

• Rerender Element with Watch
• Create Getter/Setters with getset
• Create Property Reflection with propReflect
• Create Inline Events with event
• Create Custom Events with emit
• Inject Global Styles with injectStyles
• Other features...

How You Can Help:

1. Pick a feature.
2. Write clear test cases.
3. Cover edge cases.
4. Follow naming conventions.
5. Submit a pull request!

Ready to Contribute?

1. Comment to claim a feature.
2. Fork the repo.
3. Create a new branch.
4. Submit a pull request!

Let's make testing our library fun and collaborative! 🚀