Non-functional testing is the testing process of a software application, web application or system for its non-functional requirements: the way a system operates, rather than specific behaviours of that system. This is in contrast to functional testing, which tests against functional requirements that describe the functions of a system and its components.

The names of many non-functional tests^[1] are often used interchangeably because of the overlap in scope between various non-functional requirements. For example, software performance is a broad term that includes many specific requirements like reliability and scalability.

Non-functional testing includes:

• Accessibility testing
• Baseline testing
• Compliance testing
• Documentation testing
• Endurance testing or reliability testing
• Load testing
• Localization testing and Internationalization testing
• Performance testing
• Recovery testing
• Resilience testing
• Security testing
• Scalability testing
• Stress testing
• Usability testing
• Volume testing

References