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Matt Pocock 62f43a1817 Add new skills for TDD, issue management, PRD creation, and productivity tools

- Introduced TDD skills including deep modules, interface design, mocking, refactoring, and testing guidelines.
- Added skills for breaking plans into GitHub issues and creating PRDs from conversation context.
- Implemented productivity skills for scaffolding exercises, setting up pre-commit hooks, and managing notes in Obsidian.
- Created a caveman communication mode for concise technical responses and a grilling technique for thorough plan discussions.
- Developed a skill for writing new agent skills with structured templates and guidelines.
- Included git guardrails to prevent dangerous git commands and a migration guide for using @total-typescript/shoehorn in tests.

2026-04-28 09:42:34 +01:00

653 B

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Interface Design for Testability

Good interfaces make testing natural:

Accept dependencies, don't create them

// Testable
function processOrder(order, paymentGateway) {}

// Hard to test
function processOrder(order) {
  const gateway = new StripeGateway();
}

Return results, don't produce side effects

// Testable
function calculateDiscount(cart): Discount {}

// Hard to test
function applyDiscount(cart): void {
  cart.total -= discount;
}

Small surface area
- Fewer methods = fewer tests needed
- Fewer params = simpler test setup

653 B Raw Blame History

Interface Design for Testability

653 B

Raw Blame History