Add Vitest for Regression Testing

[andrewgremlich]

How does Vitest sound for regression testing?

[AngyDev]

Yeah, this is perfect. If you want to work on it, please assign the issue to yourself; that helps visibility for everyone. Thanks

[andrewgremlich]

I'm not sure if I can assign myself...

[andrewgremlich]

Thank you! I'll hop to it

[andrewgremlich]

#22