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Understanding Non-functional testing

Non functional testing is a special type of testing performed to test the non functional requirements like response time, portability, stability etc. In this article we will discuss non functional testing in details.


The Non-Functional Testing is the kind of testing take place alongside the non functional requirements. Mainly these features are not considered in functional testing so it is used to confirm the inclination of a system. Non-functional requirements lean to be individuals that replicate the excellence of the product, mostly in the situation of the appropriateness perception of its ultimate users. It can be in progress after the end of Functional Testing. It can be effectual by using testing tools.

The testing of software controls which are not connected to any precise method or user effect such as presentation, scalability, precautions or conduct of application under some restriction.

Types of non functional testing:

Non functional testing has a vast persuade on client and user fulfillment with the result. It ought to be expressed in a testable method, not similar to; the non testable application should or easy to operate.

Mainly in this type of test is used to foremost non-functional controls of software application. Let’s take examples of non functional requirements to observe how much time the application will take to finish a job or how fast the response will be.

There are different types of non-functional testing describes below:

  • Functionality testing
  • Reliability testing
  • Usability testing
  • Efficiency testing
  • Maintainability testing
  • Portability testing
  • Baseline testing
  • Compliance testing
  • Documentation testing
  • Endurance testing
  • Load testing
  • Performance testing
  • Compatibility testing
  • Security testing
  • Scalability testing
  • Volume testing
  • Stress testing
  • Recovery testing
  • Globalizing testing and regional testing

Functionality testing:

It is performed to check that a software system performs and functions properly with respect to design disclaimer. At the time of functionality testing we check the foundation application methods, inputs, menu methods and equipment and system setup on restricted apparatus, etc.

Reliability testing:

Reliability Testing is about processing an application so that bugs are exposed and rectified before the system is used. The reason of this testing is to establish system trustworthiness, and to conclude whether the application meets the client’s reliability necessities.

Usability testing:

In usability testing mostly the testers tests the simplicity with which the user application can be used. It tests that is the software or the application created is easy to use or not.

Usability testing has five components which are described as follows:

Learnability: It is to check how simple for users to achieve fundamental tasks the foremost moment when they meet the interface?

Efficiency: To test how quickly knowledgeable users can complete tasks?

Memorability: After a phase of not using the system, when the users revisit to the interface do they memorize adequate to use it efficiently, or have to begin once more learning all?

Errors: To checks how much bugs the users create, how rigorous are these bugs and how effortlessly can users rectify the bugs?

Satisfaction: How much the users resembling using the application?

Efficiency testing: Efficiency testing examines code and testing property needed by an application to carry out a specific method. Efficiency testing is amount of test cases debug separately in part of time.

Maintainability testing: Defines that how simple it is to continue the software. This means that how easily analyzed, changed and tested the software.

Portability testing: This type of testing the easiness with which a software application can be transfer from one setting to another setting, like transferring of any application from Operating System Windows 2000 to Windows XP. It is generally calculated in requisites of the utmost quantity of attempt allowed. Results are calculated in requisites of the time essential to transfer the software and absolute the documents updates.

Baseline testing: It’s specifying the corroboration credentials and on which the test cases would be intended. The prerequisite measurement corroboration is baseline testing.

Compliance testing: This kind of testing is connected to the information technologies principles followed by the corporation and it is done to get the deflection from the corporation given principles.

Documentation testing: It includes test case measurement, test event report, test record, test diagram, test process, test testimony.

Endurance testing: Endurance testing includes a system testing with an important load extensive above an important phase of time, to determine how the system reacts in continuous use. As for example, in software testing, a system might perform precisely as predictable while experienced for 1 hour except while the same system is experienced for 3 hours, troubles like memory damage as the system to stop working or perform arbitrarily.

Load testing: This test is generally carried out to recognize the manners of the application under an exact estimated load. Load testing is took place to establish a manner of a system in both the normal and at crest situation. It is for identifying the highest working ability of an application as well as any peak situation and calculates which constituent is making disintegration. Say, if the total number of user is increased then how much memory will be obsessive, what will be the system network and bandwidth reply instant.

Performance testing: This testing is organized, to establish how quickly several features of an application work under a specific load. It also exhibit the system’s performance standard. Performance testing compares two systems to discover which one works better than other. It also measures what element of the system is responsible the system to carry out poorly.

Compatibility testing: Compatibility testing; generally tests the system or the product created with the computing background. It tests the application which is created is friendly with the operating system, hardware, database or other application or not.

Security testing: Security testing ensures that the application or the system is secured or not. It checks that can somebody hack the software or login into the application by breaking the authentication. It concludes that a system protects information and maintains performance as proposed.

Scalability testing: Scalability testing of a software application for calculating its potentiality to extent up in requisites of any of its non-functional ability like support of load, the total amount of connections, the data number etc.

Volume testing: This testing refers to testing a software application or the product with a convinced quantity of data. As for example, if we desire to volume test any system with a definite database volume we require to enlarge the database to that volume and then test the performance of the application on it.

Stress testing: Stress Testing includes testing away from ordinary prepared capability, frequently to a contravention position, in order to monitor the consequences. It is a kind of testing that is access to establish the constancy of a known system. It give better importance on toughness, availability, and fault management in a important consignment, relatively than on which would be measured accurate performance in common situation. The aims of these kinds of tests might be to guarantee the application does not damage in circumstances of inadequate computational possessions. As for example disk space or memory space.

Recovery testing: This kind of testing is done to check how quick and improved the system can recuperate after it has getting any type of damage or hardware malfunction etc. Recovery testing is the compulsory breakdown of the application in an assortment of conduct to validate that revival is appropriately worked. Let’s take an example, when an application is getting information from a set of connections, unplug the concerning line. After little time, plug up the line back in and evaluate the ability of application to carry on getting information since the position at which the set of connections got departed. Start again the system at the same time as a browser has an exact amount of sessions and verifies is the browser is capable to recuperate all of the information or not.

Globalizing testing and regional testing: Globalizing is a test method of designing an application thus the application can be personalized to different regions and languages with no changes. In the other side regional is a test method of accepting globalized system intended for an exact region or language by accumulating restricted precise mechanism and changeable text.


Some advantages of Non-Functional Testing are described below:

  • Parts of the system can be tested, which would not be tested at the time of functional tests
  • Parts like load times are not be enclosed in functional tests; as the load times of the system will not influence the general product in which the application results.

  • Gives higher level of security
  • Security of an application is tremendously significant; since if an application was not as protected as probable then it would be open to get effected.

  • Enhancement of performance of the application.
  • Functionality is also an input module to an unbeaten system; because a system is not deafening, load times being amplified etc, the largely competence of the system is very much enhanced.

  • Make Sure that the quality assurance of software can be achieved
  • Software quality assurance is vital for software to be ranked as a high value software; being achieved it declares that the software is standard enough.

  • It not at all change
  • Non-Functional testing does not change as it is forever the identical four areas of attention, e.g. functionality, protection, reliability and various.


Some disadvantages of Non-Functional Testing are described below:

  • In every time when the system is upgraded non-functional tests ought to be execute yet again
  • The explanation to execute yet again as up gradation may modify the functions to make sure the excellence of the application, such as presentation modifies protection flaws etc.

  • It becomes very expensive
  • As every time with the updating of system there have to pay to re-test this yet again.


To guarantee the quality assurance of software, non-functional testing is very significant. As because without executing non-functional testing lots of fields of the software will not be calculated as they are not enclosed in the functional tests.

Non-Functional testing ensures the performance; protection, reliability and several of application are all to their maximum standard, except of this it cannot be sure that the application is prepared for deploy without any error.

This type of testing is vital to assuring the software quality; as when software is delivered to the client it needs to be to the uppermost standard probable.

By software quality assurance software are build to a standard, exclusive of this standard the non-functional feature of software will be poor; there will be no guarantee for working so that the software might have errors e.g. low load times and arrangement go kaput.

In general, it is accomplished that exclusive of Non-Functional Testing, quality assurance of software cannot be achieved effectively.

Website: www.techalpine.com Have 16 years of experience as a technical architect and software consultant in enterprise application and product development. Have interest in new technology and innovation area along with technical...

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