Does this skill support Property-Based Testing?

Yes, it includes detailed criteria for when to use PBT and specific quality gates to ensure properties like roundtrips and invariants are properly tested.

How does it help fix flaky tests?

The skill provides patterns for condition-based waiting, replacing arbitrary 'sleep' or 'setTimeout' calls with polling mechanisms that wait for actual state changes.

What is the recommended strategy for mocking?

It suggests mocking only unmanaged external dependencies and avoiding mocking third-party libraries directly; instead, you should wrap libraries and mock your own wrapper.

When should resources be cleaned up in a test?

Long-lived resources like VMs, containers, and cloud instances must be cleaned up in the afterAll block, while database artifacts are generally fine to leave for isolation.

What is the core philosophy of this testing skill?

It advocates for testing real behavior over implementation details, favoring integration tests to provide a better confidence-to-cost ratio than isolated unit tests.

Writing Good Tests

Name: Writing Good Tests
Author: ed3dai

byed3dai

•

Security & Testing

Enforces high-confidence testing patterns including behavior-driven verification, strategic mocking, and reliable async waiting strategies.

This skill equips Claude with a comprehensive framework for creating high-quality test suites, emphasizing integration tests and behavior-driven verification over implementation details. It offers standardized patterns for condition-based waiting to eliminate flakiness, strategic mocking to avoid over-engineering, and clear rules for resource isolation and cleanup. By implementing these best practices, developers can ensure their test code remains maintainable, refactor-friendly, and effective at catching real-world regressions without polluting production logic with test-only methods.

Key Features

01Property-based testing (PBT) quality gates and implementation guides

02Behavior-focused integration testing philosophy

03Resource isolation and cleanup protocols for CI/CD environments

0445 GitHub stars

05Patterns for reliable condition-based waiting and polling

06Strategic mocking guidelines for managed vs unmanaged dependencies

Use Cases

01Establishing a standardized mocking strategy for complex external API dependencies

02Refactoring flaky test suites by replacing arbitrary timeouts with condition-based polling

03Implementing robust property-based tests for data transformations and pure functions

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add ed3dai/ed3d-plugins writing-good-tests

For use in Claude.ai and ChatGPT

Download Skill