Test-Driven Development (TDD) FAQs

Question 1

What is the Red-Green-Refactor cycle?

Accepted Answer

It is a three-step process: RED (write a failing test), GREEN (write minimal code to pass the test), and REFACTOR (clean up the code while ensuring tests stay green).

Question 2

Does TDD slow down development?

Accepted Answer

While it adds an initial step, TDD is faster in the long run because it catches bugs early, prevents regressions, and reduces the time spent on manual debugging and production fixes.

Question 3

Why is it mandatory to watch the test fail first?

Accepted Answer

If you don't see the test fail, you have no proof that the test is actually checking the new behavior. It might be passing due to a bug in the test itself or existing code.

Question 4

What is the core principle of this TDD skill?

Accepted Answer

The core principle is 'No production code without a failing test first.' This ensures that the test actually verifies the behavior and prevents writing code that isn't explicitly required.

Question 5

When should I skip TDD?

Accepted Answer

TDD should generally be used for all features and bug fixes. Exceptions include throwaway prototypes, generated code, or configuration files, usually with human partner approval.

Test-Driven Development (TDD)

主要功能

使用场景

Test-Driven Development (TDD)

主要功能

使用场景