Thanks! I am actually curious to see how those boundary tests look like. Can you share an example?

Mikalai Kardash "It's nothing fancy. I wrote a bit about that in my blog post easytdd.dev/easy-way-to-start-tdd. It's not clearly distinguished in the text as a section, but with 'find-in-page' functionality, you can search for 'ThrowsExceptionWhenExpressionIsInvalid' or 'CallbackThrowsArgumentExceptionWhenRequestIsNotValid' tests. It's more of a thinking strategy rather than a very valuable test per se.