TDD & DDD from the Ground Up
summary
Live-coding through a git repo with per-commit steps demonstrates building a university enrolment system in Java (C# option exists), starting as minimal CRUD and evolving to domain logic: JPA repositories and Spring controllers, a capacity rule (tests use a room capacity of 3 and show how concurrency once produced 21 enrollments), a domain service enroller that centralises checks, a scheduling algorithm that assigns courses to smallest suitable rooms by popularity, an automated completableFuture concurrency test and the Contextive ubiquitous-language tool.
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