Which type of testing evaluates the overall product against specified requirements?

• A. Unit testing
• B. Integration testing
• C. System testing
• D. Acceptance testing

Answer: (C)

System testing is performed to assess the overall behavior and compliance of the complete software product against the specified requirements. It takes into account all integrated components of the application, ensuring that the system meets its functional and non-functional requirements. This type of testing is typically conducted in an environment that closely resembles the production environment and aims to validate the software's end-to-end functionality.

During system testing, the product is subjected to various tests that cover operational, usability, and performance aspects, making it a holistic evaluation. It is distinct from other testing types because it focuses on how the entire system works together rather than individual parts or components. This level of testing ensures that the product behaves as intended for the end users and meets business needs.

In contrast, unit testing focuses on the smallest parts of the application, such as individual functions or classes, frequently executed by developers. Integration testing aims to verify that different modules or services work together correctly but does so at a less comprehensive level than system testing. Acceptance testing, while crucial, evaluates whether the system meets the acceptance criteria defined by stakeholders, usually at a later stage, confirming readiness for production but not always encompassing the full range of functionality and performance verification performed in system testing.