Behavior-Driven Test Writing

About

The Writing Tests skill equips Claude with a robust framework for creating test suites that prioritize real-world behavior over implementation details. By following the Testing Trophy model, this skill emphasizes integration tests that use real dependencies, ensuring that your tests provide maximum confidence and remain resilient during code refactors. It guides the AI in choosing the correct test type—E2E, integration, or unit—while providing strict mocking guidelines and assertion strategies that focus on user-observable outcomes rather than fragile internal states.

Key Features

• Implements the Testing Trophy model prioritizing integration tests
• Provides clear decision logic for E2E, Integration, and Unit test types
• Minimizes fragile mocking by favoring real dependencies and databases
• Identifies and fixes common anti-patterns like testing internal state
• 62 GitHub stars
• Includes language-specific patterns for TypeScript, React, Python, and Go

Use Cases

• Building a resilient test suite for a new feature or service
• Refactoring brittle tests that break during internal implementation changes
• Determining the most effective testing strategy for complex business logic