# Testing > TDD/BDD testing principles. Use when writing tests, reviewing test coverage, setting up testing, or discussing test strategy and test architecture. Use when this capability is needed. - Skill: `tomevault-io/testing-64` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/testing-64` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/testing-64/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/testing-64 --- # Testing - TDD/BDD Principles This skill provides universal guidelines and best practices for testing across all technology stacks. See @REFERENCE.md for detailed documentation. ## Quick Reference - **TDD Cycle**: RED → GREEN → REFACTOR - **Coverage Target**: >= 80% - **Pyramid**: Unit (70%) > Integration (20%) > E2E (10%) - **Pattern**: Arrange-Act-Assert (AAA) - **Naming**: Descriptive test names that explain behavior --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/thebeardedbearsas) — claim your Tome and manage your conversions.