Included component tests

[GJSBRT]

Just a thought. Would it be an idea to include a test for each component. As the idea of shadcn-ui is to change the components, I can see how tests could be very useful to see if a component is still behaving the same in terms of accessibility, functionality, etc.

I think this could be a nice addition. I am not too familiar with tests in javascript, so if this is a bad idea let me know :p.