CAD CAD Test-Driven Development and Agile Testing 2

Question 1

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

Accepted Answer

Replacing a real dependency with a simplified substitute for testing

Answer

A test double is any object that stands in for a real dependency (stubs, mocks, fakes, spies) to isolate the unit under test from external systems.

Question 2

What distinguishes a 'mock' from a 'stub' in unit testing?

Accepted Answer

Stubs return hardcoded values; mocks verify that certain interactions occurred

Answer

Stubs provide canned responses to calls, while mocks also record and verify that expected interactions (method calls, parameters) occurred during the test.

Question 3

What does code coverage measure in the context of TDD?

Accepted Answer

The proportion of production code lines executed by automated tests

Answer

Code coverage measures what percentage of production source lines, branches, or paths are exercised by the existing automated test suite.

Question 4

In Behavior-Driven Development (BDD), what format are test scenarios typically written in?

Accepted Answer

Given-When-Then (Gherkin)

Answer

BDD scenarios use the Given-When-Then (Gherkin) syntax to describe behavior in plain language understandable by both technical and non-technical stakeholders.

Question 5

What is 'regression testing' in an Agile context?

Accepted Answer

Re-running existing tests to confirm that new changes haven't broken previously working functionality

Answer

Regression testing ensures that new code changes do not introduce defects into existing, previously verified functionality, and is ideally automated in Agile CI pipelines.

(CAD) Certified Agile Developer Practice Test

(CAD) Certified Agile Developer Practice Test

CAD CAD Test-Driven Development and Agile Testing 2