property-based-testing

Generate and verify property-based tests across inputs for invariants and round-trips.

13|Updated Jan 18, 2026
One-click install
npx skills add https://github.com/pbdeuchler/llm-plugins --skill property-based-testing-pbdeuchler
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: property-based-testing
Source: https://github.com/pbdeuchler/llm-plugins/tree/main/plugins/house-style/skills/property-based-testing
Command: npx skills add https://github.com/pbdeuchler/llm-plugins --skill property-based-testing-pbdeuchler

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Property-based testing helps you validate software behavior across a wide range of inputs by focusing on invariants and laws rather than individual examples.

Core Features & Use Cases

  • Generates diverse input data to exercise code paths and uncover edge cases.
  • Verifies invariants such as round-trips, idempotence, and ordering properties for functions and data structures.
  • Provides a property catalog and pattern-detection guidance to improve test design.

Quick Start

Create a property-based test that asserts your function's invariants across generated inputs.

Frequently Asked Questions about property-based-testing

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

FAQPage Schema
What is property-based testing and how does it validate invariants?

Property-based testing validates software behavior by generating diverse inputs to verify invariants and laws, rather than relying on individual examples. It automatically exercises code paths to uncover edge cases and confirm round-trip properties across generated data.

How do I test serialization and parsing round-trips with generated inputs?

You can test serialization and parsing round-trips by generating diverse input data and asserting that your function's invariants hold across those inputs. This verifies that data normalization scenarios maintain their original state throughout the process.

What's the best way to design robust tests for data normalization scenarios?

The best way to design robust tests for data normalization is to apply property-based testing using a property catalog and pattern-detection guidance. This approach helps you define and verify invariants like idempotence and ordering for your data structures.

Can I use property-based testing to uncover edge cases in my functions?

Yes, property-based testing generates diverse input data specifically to exercise code paths and uncover hidden edge cases. By focusing on broad invariants rather than specific examples, it systematically exposes boundary conditions you might miss otherwise.

When should I use property-based testing instead of example-based tests?

You should use property-based testing when you need to validate invariants, round-trips, and data-normalization scenarios across a wide range of inputs. It is ideal for verifying complex serialization and parsing logic where individual examples are insufficient.