characterization-tests

refactoring tool that aims at making it easy to create characterization tests

A harness for writing Golden Master tests in Java, painlessly.

TWIST is an open framework for Li-ion cell characterization based on Python and Raspberry Pi

An extension of JUnit5 that enables approval testing for Java-based software.

An example java project created for my blog post "Golden master testing aka Characterization test: a powerful tool to win your fight against legacy code"

Regression testing system for Apertium language data and translators

Claude Code skills for repository audits and documentation: verify README and docs claims against the code, run audits where every finding cites a resolvable path:line, write AGENTS.md and CLAUDE.md with only what code cannot say, check a README's first screen, rank test gaps. Tested standard-library scripts, no network.

FastApproval is an open source assertion/verification library to aid testing

Scheduled, gated maintainer for your own repos: deterministic tools find problems, an LLM writes one patch per finding, and the PR auto-merges only when tests pass and every changed line is covered.

Simple High school management backend example showcasing 4-tier architecture pattern. Handles class enrollment, student assignments, and grading with clear seperation between layers.

Run your program once. Get real, proof-carrying tests.

legadox — a camada de seguranca do metodo Expx: skill que endurece o trabalho de IA em projetos legados para Claude Code e OpenCode. Calcula raio de impacto por evidencia, congela o comportamento atual com testes de caracterizacao, limita o diff e exige aprovacao humana onde o estrago seria real.

Baseline test and approve your serializable outputs

Behavior-preserving refactoring case study with characterization tests and a clearer domain model.

Excel/Access modernisation lab: source-controlled VBA, object inventories, characterisation tests, generated SDLC docs and .NET migration spikes.

Executable Java strangler migration: legacy characterization tests, shadow comparison, deterministic canary routing and rollback.

Executable specification of the LaserGRBL core (Python): white-box, protocol and golden tests for the FreeKerf Rust rewrite

Companion TypeScript demo for tracing, characterizing, refactoring, and changing an unfamiliar booking system.

AI-powered characterization test generator for Python — MCP server + CLI. Pin legacy code behavior in pytest before you refactor.