Test-Driven Development Guide (Rust & SQL)

What problem does it solve?

This Skill provides a rigorous framework for developing robust and maintainable Rust and SQL codebases by emphasizing test-driven development principles. It aims to prevent common pitfalls like brittle tests and implementation-detail coupling.

Core Features & Use Cases

• TDD Methodology: Guides users through vertical slicing, tracer bullets, and incremental development.
• Rust-Specific Rules: Details best practices for unit testing, mocking, and asynchronous testing in Rust.
• SQL-Specific Rules: Outlines how to effectively test SQL queries against a real database (DuckDB) with minimal seed data.
• Reference Materials: Links to related guides on deep modules, interface design, mocking, refactoring, and test patterns.
• Use Case: A developer starting a new Rust service needs to implement a data access layer. They can use this Skill to ensure all new database interactions are covered by effective, integration-style tests from the outset.

Quick Start

Follow the practical workflow outlined in the TDD guide to write a single test for a new behavior, then implement the minimal code to pass it.