Writing
Testing the Service Interface
Interface tests verify wire conversion and exception translation at their owning boundaries. Controller Hooks, middleware checks, and hosted HTTP scenarios complement domain acceptance.
Topic
Service Interface Layer
The thin host layer, such as a web API, CLI, worker or cloud function, that connects the outside world to a system. It translates transport input and forwards it to the domain, which must not depend on the host.
4 pages
Writing
Programming to Exceptions, Part 2: Diagnostics and Boundaries
Specific exceptions preserve failure meaning, causes, and context. A shallow C# hierarchy, Gateway translation, and middleware enrichment carry diagnostic records across service boundaries.
Chapter
Architecture Layers in C#
Structure communicates intent: strict layers from Domain Facade to Gateway, internal by default with a public surface the compiler enforces, and folder depth that marks each class's level of abstraction.
Chapter
Architecture Layers in Python
Structure communicates intent: strict layers from Domain Facade to Gateway, a public surface declared in the boundary __init__.py, and folder depth that marks each class's level of abstraction.