Architectural Fitness Functions and Boundary Tests
Learn to protect architectural boundaries over time using automated fitness functions and dependency-direction tests.
Architecture Erodes Silently
A clean design tends to decay. Under deadline pressure, someone imports the database into an entity, or a use case reaches into the web layer.
Code review alone misses these. We need automated guards.
What Is a Fitness Function?
An architectural fitness function is an automated test that asserts a structural property of the system.
Just as unit tests guard behavior, fitness functions guard architecture — for example, the direction of dependencies.
All lessons in this course
- Layered Testing Strategy
- Deployment Considerations for Clean Arch
- Evolving and Maintaining Clean Systems
- Architectural Fitness Functions and Boundary Tests