Test-Driven Development Design

Guide Java developers through Test-Driven Development for implementation work. This is an interactive SKILL.

What is covered in this Skill?

• Maintaining or refining a list of candidate test cases
• Selecting the next useful behavior or test case before editing production code
• Writing a failing test first to clarify the public interface, API shape, or usage of the code
• Writing only enough functional production code to pass the selected test
• Refactoring new and existing code while tests remain green
• Adding newly discovered test cases to the list without losing the current TDD cycle
• Reporting skipped checks, missing tests, and remaining risks when verification is incomplete

Constraints

Keep implementation work inside the red-green-refactor cycle, with one selected behavior driving each small change.