What is the main benefit of Property-Based Testing?

Unlike traditional tests that use specific hand-written examples, PBT checks universal properties against thousands of automatically generated inputs, uncovering edge cases and boundary conditions that humans typically miss.

Which programming languages and frameworks are supported?

This skill covers patterns applicable to over 50 languages, including popular frameworks like Hypothesis for Python, fast-check for JavaScript, PropTest for Rust, and the original QuickCheck for Haskell.

Should I replace all my unit tests with Property-Based Testing?

No. PBT is intended to complement traditional example-based tests. While PBT provides broad coverage for edge cases, example tests remain valuable for documentation and describing specific, intended behaviors.

What is 'shrinking' in property-based testing?

Shrinking is a powerful feature where the testing framework automatically reduces a large, complex failing input to the smallest possible example that still demonstrates the bug, making the root cause much easier to identify.

Property-Based Testing

Name: Property-Based Testing
Author: lev-os

bylev-os

0•

Seguridad y Pruebas

Implements robust testing strategies by defining universal software properties and automatically generating diverse input sets to uncover hidden edge cases.

This skill empowers Claude to move beyond traditional example-based testing by implementing Property-Based Testing (PBT) methodologies. It provides structured guidance on identifying universal truths (invariants) about code, configuring sophisticated input generators, and utilizing industry-standard frameworks like Hypothesis, QuickCheck, or fast-check. By focusing on general properties that must always hold true, this skill helps developers discover complex bugs, race conditions, and boundary issues that manual test cases often overlook, significantly increasing software reliability for critical systems and complex algorithms.

Características Principales

010 GitHub stars

02Identify and define universal code invariants and properties

03Utilize shrinking techniques to find minimal reproducible examples

04Configure automated input generators for complex domain data

05Apply common PBT patterns like idempotence and round-trip testing

06Analyze and resolve failing counterexamples identified by frameworks

Casos de Uso

01Finding edge cases in complex business logic and distributed systems

02Validating data structure invariants and mathematical functions

03Testing serialization and deserialization for round-trip correctness

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add lev-os/agents property-based-testing

For use in Claude.ai and ChatGPT

Características Principales

010 GitHub stars

02Identify and define universal code invariants and properties

03Utilize shrinking techniques to find minimal reproducible examples

04Configure automated input generators for complex domain data

05Apply common PBT patterns like idempotence and round-trip testing

06Analyze and resolve failing counterexamples identified by frameworks

Casos de Uso

01Finding edge cases in complex business logic and distributed systems

02Validating data structure invariants and mathematical functions

03Testing serialization and deserialization for round-trip correctness