Software Quality Assurance Practice Exam

What primarily involves evaluating components in isolation?

1. System testing

2. Integration testing

3. Unit testing

4. Performance testing

The correct answer is: Unit testing

The correct answer, unit testing, focuses on evaluating individual components or functions of a software application in isolation from the rest of the system. This practice allows developers to validate that each unit of the code performs as expected before it is integrated into a larger system. By testing components in isolation, any issues can be identified and resolved early in the development process, promoting better quality and reducing the cost of fixing defects later on. The other options relate to different levels of testing. System testing evaluates the complete and integrated software system as a whole to ensure it meets the specified requirements. Integration testing examines the interactions between integrated components or systems to identify interface defects. Performance testing assesses how the system behaves under various conditions, focusing on aspects such as speed, scalability, and reliability but not specifically isolating individual components. These distinctions clarify why unit testing is the correct choice for evaluating components in isolation.