Test-Driven Development (TDD) FAQs

Question 1

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

Accepted Answer

The Iron Law dictates that no production code is written without a failing test first. If code is written before a test, it must be deleted and started over to ensure the test actually verifies the behavior.

Question 2

What are the common TDD 'Red Flags' this skill identifies?

Accepted Answer

Red flags include tests passing immediately, adding tests after implementation, writing more code than the test requires, and skipping tests for 'simple' tasks.

Question 3

Does this skill work for bug fixing?

Accepted Answer

Yes. It requires writing a failing test that reproduces the bug before any fix is implemented, ensuring the fix is verified and preventing future regressions.

Question 4

Can I use this skill for refactoring?

Accepted Answer

Absolutely. The skill ensures that you have a solid test suite to lean on so you can improve code structure without changing its external behavior.

Question 5

How does the Red-Green-Refactor cycle work here?

Accepted Answer

First, write a failing test (Red) and verify the failure. Second, write the minimal code required to pass the test (Green). Third, clean up and optimize the code while keeping tests passing (Refactor).

Test-Driven Development (TDD)

Key Features

Use Cases

Test-Driven Development (TDD)

Key Features

Use Cases