Are there any articles or books available on good practices for unit-testing SwiftUI, including in the architecture that extends the View adding an @ObservableObject ViewModel?

I purchased and thouroughly enjoyed the book on Testing but don't recall any SwiftUI related topics in there.

Much Appreciated!

I had the same question a few months ago. I did not find any relevant articles, and only one relevant book:

The Kodeco (formerly Wenderlich) book "SwiftUI by Tutorials" has a chapter 4 on "Testing and Debugging" with 26 pages on UI testing. The book is expensive at $60. I own the previous edition of the book, but I have not taken the time to read much of it, so I can’t comment on its quality.

Even if you decide not to buy the book, you can freely download the source code from GitHub and study the code for chapter 4: https://github.com/kodecocodes/sui-materials

Here are two videos to start with. This guy is just amazing in explaining some advanced topics in simple way. You can give it a try :)

Unit Testing - here @ObservableObject is covered.

https://youtu.be/eqdvIUKsM2A?si=4Vgv3xSQ62ysfoGp

UI Testing

https://youtu.be/RoDUYFuNeJU?si=PkrQUYlhBeye9hO1