Structural equality for better tests
by Mark Seemann
A Fluent Builder as a Value Object? If you ve read a bit about unit testing, test-driven development, or other kinds of developer testing, you ve probably come across a phrase like this: Test behaviour, not implementation. It s often taken to mean something like behaviour-driven development (BDD), and that s certainly one interpretation. I ve no problem with that. My own Pluralsight course Outside-In Test-Driven Development shows a similar technique. It d be a logical fallacy, however, to thereby conclude that you can only apply that ideal in the large, but not in the small. That it s only possible to do it with coarse-grained tests at the boundary of the system, but not with unit testing.