What is Non-Functional Testing? Types with Example

This volume may generally be the size of the database or the size of a volume-tested file interface. These apps have become compulsory because others may be victims of different vulnerabilities. The reason for the same centers around running a program or application in order to capture software bugs. The reason for this is that a program or application is running to catch software bugs. It is essential, as such attacks are highly critical and enable a hacker to capture server database data.

The testing is done via investigating system architecture and the mindset of an attacker. Test cases are conducted by finding areas of code where an attack is most likely to happen. The measurement and metrics used for internal research and development are collected and produced under non-functional testing.

Functional testing validates the software product for its functionality, while non-functional testing checks different types of non-functional aspects of the system. Availability testing validates the software product for its availability. It checks to what extent the software product can continuously perform the specific tasks or functions without any failure. The primary purpose of this type of testing is to verify the efficiency of the product beyond the standard operational capacity. Performance testing validates the software product to check how well its components function.

Non-functional testing is equally important as functional testing because it tests non-functional aspects of the software product that functional testing would never address. Before performing this type of testing, it is important to devise an effective testing strategy. Recovery testing checks how the system continues to function and recover itself from failure. In other terms, it checks the ability of the software product to recover from various types of failures, including hardware/software crashes, network failures, etc. Load Testing – Load testing is done by checking the system’s ability to manage a load of multiple users using the system at the same time. During this testing, the testing team tries to put pressure on the system by logging with multiple users and accessing any particular module or function simultaneously.

definition of non-functional testing

The major goal of scalability testing is to ensure that the software product can manage the increase in data volume, traffic, etc. In other words, this type of testing checks how the software product works in a particular environment for a specific time period. The system is reliable only if it produces the expected results every time in the given environment. The primary purpose of this type of testing is to verify the readiness of the software product in accordance with non-functional parameters thatfunctional testingwould never address. One simple example of a non-functional test would be checking how many users can log in to a particular system simultaneously.

A typical example of this situation is to experiment with different load balancing methods and see the response of the application to similar levels of overload. Load tests help identify the maximum operational capacity of an application, as well as in identifying bottlenecks and the causes of possible performance degradation. To help in the reduction of cost related with non-functional aspects of the product. To help in the reduction of production risk related with non-functional aspects of the product. You want to create testing data that simulates normal conditions based on the testing scenarios that you identified previously. To do so, you will want to list out what should happen in the event that each of these scenarios occurs.

Our AI-Powered, Intelligent Automated Functional Testing Tools Can Help

Enterprise-level functional test automation tools can save time by performing more automated process steps simultaneously per hour. Using an enterprise-level version instead of a free functional testing tool provides you with more functionality and cross-organization sharing opportunities. Non-functional requirements are extremely crucial in determining how the system complies with restrictions and preconditions. Non functional requirements affect the whole process and the price and resource planning of software development and training. The thoroughness of non-functional testing can be measured through non-functional coverage. Non-functional coverage is the extent to which some type of non-functional element has been exercised by tests and is expressed as a percentage of the type of element being covered.

Originally, this tool was intended to test web applications, but later, it expanded its scope to test other applications, servers, protocols, and web services. Moreover, it comes with a fully-featured test IDE that allows you to build and record the test plan. This type of testing considers security as its testing parameter and checks how the system can protect itself against various deliberate and sudden attacks from internal and external sources. Also, it verifies that the system has no loopholes, which may lead to data breaches.

definition of non-functional testing

However, non-functional testing must be scalable to your software testing requirements. After functional testing, the software should have a consistent user experience and API and seamlessly integrate with business processes. Since definition of non-functional testing non-functional tests ensure the performance, dependability and security of the application are of the highest standard. Non-functional testing is a must and extremely important to ensure the quality of the software or application.

Have a Dedicated Automation Team

Every time the software is updated, non-functional tests are performed again. The portability testing of the software is used to verify whether the system can run on different operating systems without occurring any bug. This test also tests the working of software when there is a same operating system but different hardware. Security testing is used to detect the security flaws of the software application.

Robust demand for coders is more significant than ever, so if you want a secure, rewarding career in this growing field, Simplilearn can provide you with a strong start. This parameter ensures that the software system keeps functioning and recovers itself in the event of system failure. Before even the best software application hits the market, it must be rigorously tested. All the cool concepts and nifty “bells and whistles” in the world mean nothing if the application fails to work correctly. That’s why developers need to put a new product through its paces before the public gets a hold of it.

Functional Vs Non-Functional Testing: Expert Guide

These cargoes are based on the real requirements of end customers who are expected to use the software. API testing is a type of software testing that validates application program interfaces for their functionality, security, performance, and reliability. NeoLoad is yet another powerful performance testing tool for large enterprises. It is capable of carrying out performance testing on various types of APIs, applications, and other technologies. Basically, Neoload works by simulating the network traffic to examine the performance of the system under load.

definition of non-functional testing

Security Testing tests the system’s security measures to see if they effectively protect data and maintain intended functionality. Non-functional test failures don’t always result in a problem that users would experience, but they can point to a bigger system issue. This type of software test is used to determine the stability of a system or application, with special attention to availability and error handling when faced with overload. When the test load rises above the expected parameters, these tests are known as stress tests. When choosing a functional testing company like ZAPTEST, visiting a company’s functioning testing website can give you a better idea of what each tool offers and what it doesn’t.

Top Challenges in Healthcare Software Product Development & Its Compliances

However, the parameters of Recovery, Reliability, Security, Stability, and Usability are the most essential and should never be left out. Mindfire Solutions is committed to providing thorough and dependable quality assurance and software testing services to ensure error-free software solutions. Non-functional testing is necessary to increase the product’s marketability. We carry out non-functional testing to confirm that the end user’s interests are upheld. Failure to meet client expectations will prevent the product from becoming successful.

  • Also, keep in mind that not all research types are applicable to all programs, but rather rely on the purpose and scale of the project.
  • Dynamic testing includes test methods that focus on the identity of defects in order to avoid unexpected software or system failure.
  • When choosing a functional testing company like ZAPTEST, visiting a company’s functioning testing website can give you a better idea of what each tool offers and what it doesn’t.
  • Determining who is better at manual testing vs. scripting and using automated functional testing tools is key to successful testing.
  • Each machine in the laboratory has a testable version of the software to be published, and a test suit is carried out.
  • It checks to what extent the software product can continuously perform the specific tasks or functions without any failure.

Failover Testing ensures that the system can handle additional resources, such as servers, in the event of a failure. Performance Testing determines whether a system or component complies with the required performance standards. Therefore, to perform recovery tests it is necessary to force the failure and then verify if the recovery occurs properly. They are load tests that are carried out with demands greater than the operational capacity, often until they reach the breaking point. They allow explaining what the product supports and if it meets the expectations of the customers. For example, if the look of the user interface changes with the update, beta testing allows customers to give feedback on what works, what doesn’t, and which features are missing.


Security being the most fundamental aspect of any software product, this type of testing ensures that the system under development is secure. The system should be able to run efficiently, meeting all its functionalities without any issues on the desired platform or device. This compatibility check with different devices, operating systems, or browsers is done using compatibility testing. Non-functional testing can improve the product’s reliability, performance, manageability, and accessibility. They specify how the program should behave, while functional tests define what the program should do.


It is open-source software, freely available, and platform-independent. Moreover, it supports integration with Selenium, it can also be used as a unit testing tool. Indeed, any software testing plan must include non-functional testing.

Non-Functional Testing Types

Plus, you will also want to do unit testing for line coverage, code path coverage, and method coverage. Scalability to satisfy the growing demands and demands of customers and the environment continuously. UFT Mobile Amplify team productivity with an enterprise-level, end-to-end lab of real mobile devices and emulators. Once a defect is identified, it should be recorded on a formal tracking system that’s accessible to the entire project team. The requisite changes should be made to the application and the test case executed again to confirm resolution before a defect is marked as closed.

Performance and UX flaws can provide users with a terrible experience and harm a brand when non-functional testing is neglected. Scalability Testing tests for scalability measures the application’s capacity to grow in terms of transaction volume, data volume, user load support, etc. Load tests are a way of simulating demand on a software application and measuring the result. These tests are performed under expected demand and also in overload conditions . The non-functional characteristics of a system or application are often quantified on variable scales, such as response times in performance tests.

At the end of functional testing, you should have software that has a coherent user interface, a consistent API, and seamlessly integrates with business processes. Volume testing refers to testing a software application, where the software is subjected to a huge volume of data. Non-functional testing has a great influence on customer and user satisfaction with the product. The major drawback of non-functional testing is that testers need to verify the non-functional aspects of the system every time it gets updated. LoadTracer – It is a performance testing tool developed in C language by Trace Technologies Pvt. Hence it is really important that the software is tested also for non-functional requirements and not just for functional requirements.

Stress testing

Besides his volume of work in the gaming industry, he has written articles for Inc.Magazine and Computer Shopper, as well as software reviews for ZDNet. Glassdoor reports that full stack developers in the https://globalcloudteam.com/ United States can earn an average yearly salary of $108,901. As a rule, function testing questions can typically be answered with a “yes” or “no,” while non-functional questions elicit gradable answers.

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