CAD FREE CAD Test-Driven Development (TDD) Questions and Answers 2

Question 1

In TDD, what is the primary purpose of the refactoring step after a test passes?

Accepted Answer

To improve code structure without changing behavior

Answer

Refactoring in TDD improves the internal structure and readability of code while keeping all existing tests passing and behavior unchanged.

Question 2

Which of the following best describes the 'Arrange-Act-Assert' pattern in TDD?

Accepted Answer

A pattern where you set up preconditions, execute the action, and verify the outcome

Answer

Arrange-Act-Assert (AAA) structures each test by setting up the test data, performing the action under test, and then verifying the expected result.

Question 3

What is a 'test double' in the context of TDD?

Accepted Answer

An object that stands in for a real dependency during testing

Answer

A test double is a generic term for any object that replaces a real dependency, including mocks, stubs, fakes, and spies.

Question 4

Why should TDD practitioners avoid writing multiple failing tests before making any of them pass?

Accepted Answer

It makes it unclear which code change satisfies which requirement

Answer

Writing multiple failing tests at once obscures the direct link between a specific code change and the test it satisfies, undermining the tight feedback loop TDD relies on.

Question 5

In TDD, what does 'triangulation' refer to?

Accepted Answer

Adding more specific test cases to drive a more general implementation

Answer

Triangulation involves writing additional test cases with different inputs to force the implementation to become more generalized rather than hard-coded.

(CAD) Certified Agile Developer Practice Test

(CAD) Certified Agile Developer Practice Test

CAD FREE CAD Test-Driven Development (TDD) Questions and Answers 2