codebase-design

A deep module in software architecture features a small interface backed by a large implementation, maximizing leverage and testability. This design pattern allows complex functionality to be accessed through simple interfaces, reducing system complexity.

To design module interfaces for testability, focus on creating deep modules with small interfaces and testing strictly at the interface level. This ensures your tests remain robust against internal implementation changes.

Manage seams during refactoring by defining clear boundaries for module modification without altering the underlying implementation. This seam discipline allows effective module modification while isolating internal changes from the interface.

Interface depth improves software architecture leverage by encapsulating significant implementation behind a minimal interface. Deep modules provide high leverage because they hide complexity, allowing developers to control more functionality with less code.

The best way to test deep modules is by targeting the interface level rather than internal implementation details. Testing at the interface ensures your tests validate functionality robustly while remaining unaffected by internal refactoring.

Refactor a module to increase its interface depth when its interface becomes too wide relative to its implementation, reducing leverage and testability. Deepening the interface hides complexity and makes the module more AI-navigable.