Individual skill
testing-pro
Professional testing craft: test design, doubles, boundaries, maintainable suites, and testing strategy. Use when writing tests, designing test suites, or improving testing practice.
skills/testing-pro/SKILL.md
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# Testing Pro
## Overview
Good tests — **fast, deterministic, behavior-focused, and maintainable** — are a design tool and a
safety net. Bad tests — slow, flaky, implementation-coupled — are a tax everyone pays. This skill
covers the craft: designing tests that specify behavior, using test doubles judiciously, structuring
suites for speed and clarity, and keeping the suite trustworthy over time.
The through-line: tests should make change *safer*, not harder — if tests fight refactoring, the
tests are wrong.
## When to use
