tdd-constraints

What problem does it solve?

This Skill provides a rigorous framework for implementing Test-Driven Development (TDD) with strict phase boundaries to prevent domain-modeling drift, ensuring tests drive design and domain concepts from the start.

Core Features & Use Cases

• Enforces a four-phase TD cycle: RED → DOMAIN → GREEN → DOMAIN, with explicit checks and ownership.
• Promotes domain modeling at each checkpoint to avoid primitive obsession and unclear invariants.
• Applies to any language or test framework, enabling drill-down testing and disciplined iteration.

Quick Start

Start with a single red test, pause for DOMAIN review, create domain types as stubs, implement the minimal green code, then perform post-green domain review and repeat for next criteria.