Skills Library / Test Case Writer / for Claude

Test Case Writer — for Claude

This is the Claude version of the Test Case Writer skill: produce a test plan for a feature: happy paths, edges, and failure modes as a checklist. This is the native form: a SKILL.md file. Claude reads the description to decide when the skill applies, then follows the body.

The file

---
name: test-case-writer
description: Write test cases for a feature or function. Use when given a feature description, spec, or code to test.
---

# Test Case Writer
## Inputs
A feature description, spec, or code. If acceptance criteria exist, they anchor the plan.

## Procedure
1. Extract the behaviors the feature promises, one per line.
2. For each behavior write: the happy-path case; the boundary cases (empty, zero, maximum, first, last); the failure cases (invalid input, missing dependency, interruption mid-way).
3. Order the plan by risk: the case that would hurt most if broken goes first.

## Standards
- Expected results must be observable and exact - "works correctly" is not an expected result.
- Every acceptance criterion maps to at least one case; show the mapping.

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Download SKILL.md

Install

Create the folder .claude/skills/test-case-writer/ in your project (or ~/.claude/skills/ for all projects)
Save the file as SKILL.md inside it
Start a new session and present the task - the skill triggers from its description

Other platforms

ChatGPT version Gemini version Microsoft Copilot version Qwen & Kimi version Local Models version

Canonical version and the skill's full description: Test Case Writer. The underlying procedure is identical on every platform - only the packaging differs, because each model takes its skills its own way.

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