Non Functional Testing

Primarily, intended and expected functioning of a software is of utmost importance, still its performance under different, unexpected circumstances and conditions to meet different needs & expectations of the user also decides the level of the quality in a software product.

Functional testing is one of the primary testing performed on the software application to ensure the adherence of each and every functional requirements and specifications in the software product, but what about the non-functional requirement? Non-functional requirements can be anything other than intended functionalities and features and may include following elements:

non-functional requirements

Besides above stated non-functional requirements, there are some more parameters and attributes which needs to evaluated and tested to ensure the overall quality of the released software product.

What is Non-functional Testing?

Non-functional testing is a major testing term that encapsulates various productive testing techniques to evaluate and assess the non-functional traits of software application. Prime purpose of this testing methodology is to evaluate the competency and effectiveness of an application under variant and unforeseen conditions. It may be seen as one stop solution for the questions related to software like:

  • How quickly it responses?
  • If it is compatible with its surrounding environment including peripheral devices, software and hardware?
  • How many users can simultaneously login into it?
  • How quickly it can recover from any sort of failure, breakdown or interruption?
  • If there is any issue w.r.t its installation of multiple variants of devices, OS, configurations and network settings?
  • If it can be easily and quickly adapted by a new user?
  • , and many more....

What may be tested in Non Functional Testing?

Unlike functional testing which is based on pre-defined requirements and specifications, non-functional testing focuses on user's perspectives like compatibility, maintainability, load capability etc. Some of the areas that may be covered under non-functional testing are

non-functional requirements

Non-Functional Sub-Testing Types

Non-functional testing may be categorized under various testing methods as stated below:

  1. Availability Testing:

    Availability Testing is an approach of testing the integrated system testing, contrary to what is available for its operational requirements. It is carried out to ensure the 24*7 availability of software application to perform its intended functionalities, whenever required without getting failed. For further reading visit availability testing.

  2. Compatibility Testing:

    This testing is necessary to evaluate the compatibility of a software product with its expected working environment including multiple platforms, OS, devices, software and hardware to execute its intended functionalities properly without any issues. For further information, click compatibility testing.

  3. Configuration Testing

    Configuration testing is performed to ensure that the final product works seamlessly with the supported & different software and hardware configuration. Click configuration testing to read more.

  4. Compliance Testing:

    Also known by the name of conformance testing, compliance testing is used to ensure the software functioning and performance in accordance to company's established standards & guidelines.

  5. Installation Testing:

    Also known as "implementation testing", this testing technique is used to evaluate and assess the expected functioning of the software, post its successful installation and simultaneously ensuring no issues or errors during the process of software installation, upgrades and un-installation.

  6. Documentation Testing:

    To examine the documentation artifacts, prepared before and during the Software development and testing phase such as various requirements, specifications, plans, strategies and other related and tangible elements, documentation testing of the system is carried out as a part of non-functional testing

  7. Load Testing:

    One of the simplest types of performance testing which is used to system's performance in terms of its behaviour & response under variant load factors. To explore more, click load testing

  8. Endurance Testing:

    Testing software capability or durability to endure huge and constant load, consistently for a longer period time falls under the technique of endurance testing

  9. Localization and Internationalization Testing:

    The purpose of localization testing is to verify the quality of the software's local attributes targeted for a particular population/culture/region to ensure the correct and expected functioning of the localized version for a particular region to meet the needs & expectations of the targeted audience whereas internationalization testing concerns with the overall uniform functionality of the software globally, across all different geographical regions.

  10. Performance Testing:

    A major testing methodology involving different testing techniques to examine the response, stability, scalability, reliability and other quality metrics of a software product under real world environment and conditions. For further reading, click performance testing

  11. Maintainability Testing:

    Maintainability testing is used to evaluate the capability of the software application to get easily upgraded or modified in order to meet the growing needs & requirements of the users.

  12. Recovery Testing:

    This testing involves the wilful failure or crash of the software application in order to assess its ability to get recovered and fully functional, quickly. To explore more, visit recovery testing.

  13. Security Testing:

    Security testing is used to verify and validate the security features of the software, including identification and detection of security loopholes and other related vulnerabilities so as to ensure the protection, authenticity, confidentiality and integrity of information and data stored in or shared with the system.

  14. Reliability Testing:

    Covering load and feature testing under its belt, software reliability gives a measure of the product’s life cycle between two failures and the time it takes to repair. For further reading, please visit Reliability testing

  15. Volume Testing

    In volume testing, software product is subjected to or burdened with huge amount of data so as to measure and assess the response, behaviour and effectiveness of the application. For further reading, click volume testing

  16. Scalability Testing

    Scalability testing ensures that the system should be scalable, in proportion to increase in the load, number of concurrent users, data size, etc. whenever required.

  17. Usability Testing

    This testing technique is being used to evaluate the user-friendliness features of the system to ensure no issues to the end-users while using and handling the system. For further information, click usability testing

  18. Stress Testing:

    An extreme form of load testing under performance testing methodology which emphasizes on robustness feature of software product by making it functioning under severe and extreme conditions apart from the gradually increasing load on the system. For further reading, click stress testing

Non-functional testing is as important as the functional testing is. Without verifying and validating the interoperability across multiple platforms, maintainability, security, portability and other miscellaneous features, we cannot guarantee the product readiness for its market release and extensive use by the users in the real environment and factors.