How does it handle external dependencies in tests?

It enforces strict mocking discipline, encouraging the use of stubs and fakes at boundaries to keep unit tests fast, deterministic, and isolated from APIs or databases.

Can this skill help improve my existing test suite?

Absolutely. It includes a detection matrix for identifying testing issues like shared mutable state, implementation coupling, and lack of assertions during code reviews.

Does this skill work with specific frameworks like Jest or Vitest?

Yes, it includes a lookup mechanism that detects your project's specific testing framework and applies these best practices within that specific technical context.

What is the primary focus of this unit testing skill?

The skill focuses on testing behavior rather than implementation, ensuring that tests remain stable even when internal code is refactored.

Unit Testing Best Practices

Name: Unit Testing Best Practices
Author: thermiteau

bythermiteau

0•

Security & Testing

Enforces professional unit testing standards and conventions to ensure test suites are meaningful, fast, and maintainable.

This skill provides Claude with a comprehensive framework for writing and reviewing unit tests based on industry best practices. It guides the model to focus on testing behavior rather than implementation details, implement the Arrange-Act-Assert (AAA) pattern, and apply strict mocking discipline to ensure test isolation. By automatically detecting project-specific tools like Vitest, Jest, or Pytest, it adapts these universal standards to your specific codebase, helping you maintain a high-quality, non-flaky test suite that serves as reliable documentation for your software's contract.

Key Features

01Standardized Arrange-Act-Assert (AAA) structure

02Behavior-driven test design principles

03Advanced mocking, stubbing, and isolation strategies

040 GitHub stars

05Code review patterns for identifying brittle or tautological tests

06Automatic detection of project-specific testing frameworks

Use Cases

01Generating robust unit tests for new business logic and public APIs

02Conducting automated code reviews to identify common testing anti-patterns

03Refactoring brittle tests that are overly coupled to implementation details

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add thermiteau/maverick-private mav-bp-unit-testing

For use in Claude.ai and ChatGPT

Key Features

01Standardized Arrange-Act-Assert (AAA) structure

02Behavior-driven test design principles

03Advanced mocking, stubbing, and isolation strategies

040 GitHub stars

05Code review patterns for identifying brittle or tautological tests

06Automatic detection of project-specific testing frameworks

Use Cases

01Generating robust unit tests for new business logic and public APIs

02Conducting automated code reviews to identify common testing anti-patterns

03Refactoring brittle tests that are overly coupled to implementation details

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add thermiteau/maverick-private mav-bp-unit-testing

For use in Claude.ai and ChatGPT