TDD Review Enforcement

Domain knowledge for reviewing TDD implementations against 5 test design mandates, test budget, TDD phase compliance (3-phase canon per ADR-025), and external validity.

5 Test Design Mandates

Mandate 1: Observable Behavioral Outcomes

All assertions validate observable outcomes, never internal structure.

Observable: return values from driving ports | state changes via queries | side effects at driven port boundaries | exceptions from public API | business invariants

Violations: asserting private fields | verifying internal method call order | inspecting intermediate calculations | checking internal class instantiation

Severity: Blocker. Rewrite to assert observable outcomes only.

Mandate 2: No Domain Layer Unit Tests

Zero unit tests of domain entities/value objects/services directly. Test indirectly through application service (driving port) tests.