jorgesouzaRa/interface-design
.cursor/skills/interface-design/SKILL.md
Interface design for testability (dependency injection, pure results, small surface). Use when designing APIs, reviewing testability, or refactoring for tests.
development
Updated Apr 16, 2026
$ install --global
skillsauthnpx skillsauth add jorgesouzaRa/conectAPI_jira_github interface-designInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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SKILL.md
- name:
- interface-design
- description:
- >-
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
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