CAD Test-Driven Development (TDD) 2

Question 1

What does the 'Red' phase in the Red-Green-Refactor cycle indicate?

Accepted Answer

The test fails because the production code doesn't exist yet

Answer

Red means the newly written test fails, confirming the feature is not yet implemented.

Question 2

Which practice does TDD most directly discourage?

Accepted Answer

Writing production code before any test exists

Answer

TDD mandates that a failing test must exist before production code is written.

Question 3

In TDD, what is the purpose of writing only the minimum code to pass a test?

Accepted Answer

To avoid over-engineering and keep design emergent

Answer

Writing minimal code prevents premature optimization and lets design evolve from actual requirements.

Question 4

A developer writes a test that passes immediately without any production code changes. This is called a:

Accepted Answer

Degenerate test

Answer

A test that passes without implementation changes is a degenerate (trivially-passing) test that provides no value.

Question 5

What is 'triangulation' in the context of TDD?

Accepted Answer

Adding multiple specific examples to drive out a general algorithm

Answer

Triangulation means writing multiple concrete test cases to force a general, correct implementation rather than a hard-coded one.

(CAD) Certified Agile Developer Practice Test