skills.rest
gustavscirulis
gustavscirulisCOMMUNITY
Explore all skills by this author →
𝕏@gustavscirulisGitHub

characterization-test-generator

Generate characterization tests capturing current behavior of Swift code before refactoring.

114|8|Updated Mar 4, 2025
Search Tags:#testing#refactoring#regression testing#legacy code#characterization tests#AI assisted
One-click install
npx skills add https://github.com/gustavscirulis/snapgrid --skill characterization-test-generator-gustavscirulis
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: characterization-test-generator
Source: https://github.com/gustavscirulis/snapgrid/tree/main/.claude/skills/skills/testing/characterization-test-generator
Command: npx skills add https://github.com/gustavscirulis/snapgrid --skill characterization-test-generator-gustavscirulis

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill generates characterization tests to capture the current behavior of existing code, providing a safety net before AI-assisted refactoring or modifications to legacy code.

Core Features & Use Cases

  • Behavior Capture: Documents what code actually does, not what it should do.
  • Refactoring Confidence: Enables safe modification of code by freezing current behavior as a regression suite.
  • Use Case: Before using an AI to refactor a critical, untested module, generate characterization tests to ensure no existing functionality is inadvertently broken.

Quick Start

Use the characterization-test-generator skill to generate tests for the ItemManager class.

Frequently Asked Questions about characterization-test-generator

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I safely refactor legacy Swift code that has no existing tests?▼

To safely refactor legacy code, generate characterization tests that document what the code actually does. This captures current behavior as a regression suite, providing a safety net before AI-assisted modifications or refactoring untested modules.

What is a characterization test and when do I need it for refactoring?▼

A characterization test documents what code actually does, not what it should do. You need it before refactoring legacy or untested code to freeze current behavior as a regression suite, preventing unintended functional changes during AI-assisted modifications.

How do I generate a regression suite for Swift code before modifying it?▼

Use a characterization test generator to identify the public API surface, input/output types, side effects, dependencies, and state mutations of your Swift code. This process captures actual behavior to create a regression suite for safe modifications.

Can I use AI-assisted refactoring on untested modules without breaking functionality?▼

Yes, by generating characterization tests first to capture the actual behavior of the untested module. This creates a regression suite that verifies AI-assisted refactoring does not inadvertently break existing functionality.

Does the characterization test generator identify state mutations and side effects in Swift?▼

Yes, the generator identifies the public API surface, input/output types, side effects, dependencies, and state mutations for Swift code to accurately document current behavior before refactoring.

Related Skills

Explore More Software Engineering Skills→
CES-LtdCES-Ltd
28

skill-coverage-audit

Analyze source code to identify untested paths and generate tests.

Official
Advanced
eng-vmessiaheng-vmessiah
2

ai-regression-testing

Automate regression tests validating API response shapes and state integrity.

Community
Intermediate
venomez-vipervenomez-viper
1

characterization-test-generator

Generate characterization tests documenting current code behavior before refactoring.

Community
Advanced
nklischnklisch
7

test-quality

Generate spec-driven tests from documentation, designs, and contracts.

Community
Advanced