scala-testing

@oluies

Testing conventions for this Scala DDD sample — ScalaTest 3.2 (`AnyFunSuite`, `AnyFlatSpec`, `should/Matchers`), MUnit, and ScalaCheck property-based tests. Covers the migration from ScalaTest 1.2 (currently on the classpath) to a Scala 3-compatible release, fixture conventions, mocking via Mockito-Scala, and integration tests against the Hibernate persistence layer. Use when writing or porting tests, or when a test is failing for a reason that looks framework-related rather than logic-related.