Test-Driven Development (TDD) FAQs

Question 1

Why is the 'Verify RED' step mandatory?

Accepted Answer

If you don't watch a test fail, you cannot be certain that it is testing the right thing or that it won't pass by accident, which renders the test unreliable.

Question 2

What is the 'Iron Law' of this TDD skill?

Accepted Answer

The Iron Law dictates that you must never write production code without first writing a test that fails. If code is written before a test, it should be deleted and restarted to ensure the test truly validates the logic.

Question 3

Can I use this skill with any programming language?

Accepted Answer

Yes, the TDD principles enforced by this skill are universal and can be applied to any language or framework, from TypeScript and Python to Go and Rust.

Question 4

Will using TDD with Claude Code slow down my development?

Accepted Answer

While it may seem slower initially, TDD actually speeds up development by drastically reducing the time spent on manual debugging and preventing regressions later in the project.

Question 5

How does this skill handle refactoring?

Accepted Answer

Refactoring is only suggested after a test is green. The skill ensures you clean up duplication and improve naming while keeping the tests passing, without adding new functionality.

Test-Driven Development (TDD)

Key Features

Use Cases

Test-Driven Development (TDD)

Key Features

Use Cases