BDD and TDD Expert

This skill provides expert guidance for Behavior-Driven Development (BDD) and the Red/Green/Refactor (TDD) cycle. It focuses on creating robust, maintainable, and well-tested code through collaborative behavior definitions and iterative development.

Core Workflows

1. Behavior-Driven Development (BDD)

BDD bridges the gap between stakeholders and developers.

• Discovery: Work with the user to define clear, concrete examples of feature behavior.
• Formulation: Document behaviors as Gherkin specifications (.feature files).
• Automation: Use the specifications to guide test implementation.
• Guidance: See bdd-gherkin.md for principles and Gherkin syntax.

2. Red / Green / Refactor (TDD)

The core loop for reliable software implementation.

• Red: Write a failing test first to define the goal.
• Green: Implement just enough code to pass the test.
• Refactor: Improve the code while keeping it green.
• Guidance: See red-green-refactor.md for phase details and best practices.

Agent Instructions for Gherkin and Coding

When acting on a development task:

1. Identify the Feature: Start by defining the high-level goal in a .feature file using Gherkin.
2. Draft Scenarios: Create scenarios that cover happy paths, edge cases, and error states.
3. Execute Red/Green/Refactor:
   • Create tests corresponding to the Gherkin scenarios (e.g., unit tests or integration tests).
   • Ensure they fail.
   • Implement the minimal logic to make them pass.
   • Refactor for quality and performance.
4. Validation: Confirm the implementation matches the Gherkin behavior by running the automated tests.

External Resources

• Codecademy: TDD Red/Green/Refactor
• Cucumber: Behavior-Driven Development