Which statement below BEST describes non-functional testing?
A. The process of testing an integrated system to verify that it meets specified requirements.
B. The process of testing to determine the compliance of a system to coding standards.
C. Testing without reference to the internal structure of a system.
D. Testing system attributes, such as usability, reliability or maintainability.
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The answer A is wrong, it should be D:
Non-functional testing is the process of using tests to determine how a system, such as a software application, complies with relevant coding standards like usability, reliability, maintainability, performance, scalability, security, etc.
These nonfunctional parameters are not related to a specific function or user action, and therefore are not addressed by functional testing. Because of this, non-functional testing serves an important purpose, as nonfunctional aspects must work together with functional aspects to ensure a cohesive working system, and it is as important as functional testing to be sure the application meets business expectations.