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

Question 1

A developer practicing Test-Driven Development (TDD) writes a test for a new feature and runs it, confirming that it fails. According to the TDD cycle, what is the immediate next step?

Accepted Answer

Write the simplest possible production code to make the test pass.

Answer

Refactor the existing code to improve its design.

Answer

Write another failing test for the next part of the feature.

Answer

Ask a QA engineer to review and approve the failing test.

Question 2

An agile team is adopting TDD to improve their software quality. One of the primary benefits they can expect is that TDD fosters a specific type of design. Which of the following best describes this design approach?

Accepted Answer

Emergent Design

Answer

Big Design Up Front (BDUF)

Answer

Contract-First Design

Answer

Architecture-Driven Design

Question 3

During the 'Refactor' step of the TDD cycle, what is the developer's main goal?

Accepted Answer

To improve the internal structure and readability of the code without changing its external behavior.

Answer

To add new functionality that was discovered while writing the code.

Answer

To write more tests to increase code coverage.

Answer

To ensure the code integrates correctly with other system modules.

Question 4

A developer is tasked with adding a complex validation rule to an existing feature. Using a strict TDD approach, which of the following should they do FIRST?

Accepted Answer

Write a small, specific unit test that checks for the new validation rule and fails.

Answer

Modify the existing production code to include the new validation logic.

Answer

Discuss the design of the validation rule with the system architect.

Answer

Create an integration test to see how the new rule affects the entire feature.

Question 5

Which of the following is a common misconception about Test-Driven Development in an Agile context?

Accepted Answer

TDD requires writing all possible tests for a feature before writing any implementation code.

Answer

TDD creates a safety net of regression tests that enables confident refactoring.

Answer

TDD serves as a form of living documentation for the code's behavior.

Answer

TDD helps developers focus on writing only the code that is necessary to meet requirements.

Question 6

An agile developer is in the 'Green' phase of the TDD cycle. They have just written some code that makes their failing test pass. However, they notice the code is inefficient and contains some duplication. What should they do NEXT?

Accepted Answer

Move to the 'Refactor' phase to clean up the code while keeping the test green.

Answer

Immediately rewrite the code to be more efficient.

Answer

Write another failing test for the next piece of functionality.

Answer

Commit the code as-is because the test is passing.