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Non-Functional Testing - GeeksforGeeks

Last Updated : 20 Jul, 2025

Non-functional Testing is a type of software testing that is performed to verify the non-functional requirements of the application. It verifies whether the behavior of the system is as per the requirement or not.

Here is the Non-Functional Testing Techniques and Types mentioned bellow:

• Performance Testing: Performance testing is a type of software testing that focuses on evaluating the performance and scalability of a system or application. Performance testing aims to identify bottlenecks, measure system performance under various loads and conditions, and ensure that the system can handle the expected number of users or transactions.
• Load Testing: Load testing determines the behavior of the application when multiple users use it at the same time. It is the response of the system measured under varying load conditions.
• Security Testing: Security testing is important to check and sure that applications and systems are protected from various threats. There are several types of security testing, each targeting specific vulnerabilities and aspects of security. 

The objectives of non-functional testing are:

• Increased usability: To increase usability, efficiency, maintainability, and portability of the product.
• Reduction in production risk: To help in the reduction of production risk related to non-functional aspects of the product.
• Cost Reduction: To help in the reduction of costs related to non-functional aspects of the product.
• Optimize installation: To optimize the installation, execution, and monitoring way of the product.
• Collect metrics: To collect and produce measurements and metrics for internal research and development.
• Enhance knowledge of product: To improve and enhance knowledge of the product behavior and technologies in use.

Let's find some common non-functional testing parameters. These parameters are often used to ensure a system's performance, reliability, usability, and other quality attributes.

1. Security: This parameter is tested during Security testing. This parameter defines how the system is secure against sudden attacks from internal and external sources.
2. Reliability: This parameter is tested during Reliability testing. This defines the extent to which the system performs its intended functions without failure.
3. Survivability: This parameter is tested during Recovery testing. This parameter checks that the software system is able to recover itself in the case of failure and continuously performs the specified function without any failure.
4. Availability: This is tested during Stability testing. Availability here means the availability percentage of the software system to the original service level agreement. It means the degree to which the user can rely on the software during its operation.
5. Efficiency: This parameter means the extent to which the software system can handle the quantity and response time.
6. Integrity: This parameter measures how high the source code quality is when it is passed on to the QA.
7. Usability: This is tested in usability testing. This parameter means how easily usable the system is from the user's perspective.
8. Flexibility: This parameter means how well the system can respond to uncertainty in a way that allows it to function normally. 
9. Scalability: This parameter is tested during scalability testing. This parameter measures the degree to which the application can scale up or scale out its processing capacity to meet an increase in demand.
10. Reusability: This means how many existing assets can be reused in some form within the software product development process or in another application. 
11. Interoperability: This parameter is tested during the Interoperability testing. This checks that the application interfaces properly with its components or other application or software. 
12. Portability: This parameter checks the ease with which the software can be moved from one environment to another.

Here is the Non-functional testing advantages that enhance software quality and user satisfaction:

• Improved performance: Non-functional testing checks the performance of the system and determines the performance bottlenecks that can affect the performance.
• Less time-consuming: Non-functional testing is overall less time-consuming than the other testing process.
• Improves user experience: Non-functional testing like Usability testing checks how easily usable and user-friendly the software is for the users. Thus, focus on improving the overall user experience for the application.
• More secure product: As non-functional testing specifically includes security testing that checks the security bottlenecks of the application and how secure is the application against attacks from internal and external sources.

Here are the Non-functional testing dis-advantages:

• Non-functional tests are performed repeatedly: Whenever there is a change in the application, non-functional testing is performed again. Thus, it is more resource intensive.
• Expensive in case of software update: In case of software update, non-functional testing is performed again thus incurring extra charges to re-examine the software, and thus software becomes expensive.

Non-functional testing check that the software meets the requirement, security, and performance standards. While it improve the user experience and security, it can be want the resources and costly during updates. Overall, it is a crucial for delivering a reliable and easy development the software product.

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