While functional testing ensures what the system does, non-functional testing focuses on how well the system performs under various conditions. These testing types evaluate the quality attributes of the software — such as performance, usability, security, and reliability — ensuring that the application not only works but works efficiently and effectively in real-world environments.

🔍 Key Non-Functional Testing Types:

• Performance Testing – Checks the system’s responsiveness, speed, scalability, and stability under expected workloads.
• Load Testing – Determines how the application behaves under normal and peak load conditions.
• Stress Testing – Tests the system’s limits and identifies breaking points under extreme workloads.
• Security Testing – Ensures that data and resources are protected from unauthorized access and vulnerabilities.
• Usability Testing – Evaluates how user-friendly, intuitive, and accessible the application is.
• Compatibility Testing – Verifies that the application works across different devices, browsers, and operating systems.
• Reliability Recovery Testing – Checks the system’s ability to recover from failures and maintain stable operations over time.