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DIFFERENCE BETWEEN FUNCTIONAL TESTING AND NON FUNCTIONAL TESTING

LIST OF SOFTWARE TESTING TYPES

This article intends to bring about the difference between functional testing and non functional testing.

The list of software testing types with 100 types of software testing types are published in two articles –

Below links have the description of some more software testing types:

Testing types -1

Testing types -2

Software Testing Types:

Below are the different software testing types discussed in this article.

  1. Functional Testing
  2. Non- functional testing

Functional Testing:

The functional testing is a process of testing all the functions of a software application. It checks the quality of the software. It is a type of black box testing. Functional testing involves identifying the functions of software in the requirement and creation of certain input data based on functional requirement of a particular software. Functional testing  does not test a module or method of a program. It tests the part of functions of the whole system.

In functional testing System Program code is not necessary. It completely works on the behaviour of the program. Example : Given the extension code of the phone number output : it displays the list of countries. Functional testing focuses on testing main functions of a software. It checks whether the user is comfortable with the functions of the software and can efficiently work on the screen without any difficulty. It efficiently checks the  errors in the application and provides better access to defects.

Non Functional Testing:

Non Functional testing works for non functional activities of an application. As we know that functional testing a process which directly tests the functions related to the software, the Non functional testing tests on non functional aspects of the application software like the performance of the software under different conditions, whether the software can handle stress, whether it works efficiently when too many users are logged in etc. working on the non requirement aspects of the customer is what is called as non functional testing.

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41 thoughts on “DIFFERENCE BETWEEN FUNCTIONAL TESTING AND NON FUNCTIONAL TESTING”

  1. Functional testing is a process of testing all the functions of a software. it checks the quality, tests the part of functions of the whole system and focuses on testing main functions of a software.
    Non Functional testing involves with the test of non functional activities of an application of the software. It checks whether the software can handle stress, or it works efficiently when too many users are logged in it. Non Functional testing is included with Performance Testing, which checks the load capacity of software and maintain the stress and also with Security Testing, which means data protection and data recovery fault management etc. So, this testing is done by Compatibility Testing, which involves with efficiency and reliability of the software for different operating systems and system environment.

  2. The difference between Functional Testing and Non Functional testing.
    Functional testing is to test all the functions of a software application and check the quality. Non Functional testing is to test on non-functional aspect of the application, for example, performance under different conditions, stress test, and how it works with too many users logged in.

  3. The functional testing is a process of testing all the functions of a software application. It checks the quality of the software.
    Wherease, Non functional testing works for non functional activities of an application

  4. The functional testing is a process of testing all the functions of a software application. it checks the quality of the software it is a type of black box testing functional testing does not test a module or method of program functional testing system program code is not necessary.
    Non-functional testing works for non-functional activities of an application. non-functional testing tests on aspects of the application software like the performance of the software.

  5. The difference between functional and non functional testing:
    Functional Testing :
    The Functional Testing is a process of testing all the function of a software application. It check the quality of the software. It is a type of Black Box Testing. Functional Testing checks whether the users is comfortable with the functions of the software and can efficiently work on the screen without any difficulty.
    Non Functional Testing :
    The Non Functional Testing tests on Non Functional aspects of the software like the performance of software under different condition , whether the software can handle stress ,whether it works efficiently when too many users logged in etc.,

  6. Functional testing is concerned how the system how it executes its function and quality of the software. A where as, non functional testing is evaluate the readiness of the system.

  7. It is about the difference between Functional Testing and Non-functional testing.
    Functional testing is a type of black box testing, and it focuses on the main function testing of the software. Non-functional testing works on the performance under different environment, such as load testing, data/resource/usage performance test.

  8. The Difference between Functional and Non Functional testing:
    Fuctional Testing: test each functionality of the system. In Functionality testing, every functionality of the system is tested by proving input, verifying the output and comparing the actual results with expected results.It describes what the product does and perfomed before non functional testing.

    Non Functional Testing: Non Functional testing is the type of testing to check non functional activities like performance, reliability, Usability etc.unlike functional testing, It describes how the product works and performed after functional testing.

  9. The difference between functional testing and non functional testing:
    The functional testing checks the quality of the software and it identifies the functions of the software in the requirement and it works on the behavior of the program and it checks whether the user is comfortable with the functions of the software.
    Non functional testing works for non functional activities of an application. It works on the non requirement aspects of the customer.

  10. Functional testing verifies the operation of each function in the software according to the requirement specification.It does not concerned about the source code.Each functionality is tested by valid input,verifying output and comparing the actual results with expected one.
    Non-functional testing is to check the non functional aspects like performance,usability,reliability etc.

  11. Functional testing is the of testing all the functions of a software application. It is a type of black box testing. It focuses on testing main functions of a software. It checks whether the user is comfortable with the functions of the software and can efficiently work on the screen without any difficulty. The nonfunctional testing tests non functional aspects of an application, whether the software can handle stress, whether it works efficiently when too many users are logged in etc. For example performance testing.

  12. The difference between Functional and Non-functional testing.
    1) Functional testing -It is the behavior/execution of the software.It checks the quality of the software.
    2) Nonfunctional testing- It is performance or usability of the software.It checks if software can handle stress, or if it works efficiently when too many users are logged in.

  13. Functional testing is where the user tests the functions of the system derived from the functional requirements.
    Non Functional testing is based on the reliability of the software and if it matches the client requirements.

  14. Functional testing is a black box testing by QA, it tests the particular functions of the software based on the requirements. It does not test a method of the software and program code is not needed.
    Non-functional testing involves more of the general performance of the software. That includes the security and compatibility of the software to different browsers and platforms. It tests for maintainability, reliability, efficiency, user friendliness and portability.

  15. Functional testing is used to test functions of the software . It does not test method/modules of program ie we don’t need programming details. It is kind of black box testing to test quality of software.
    Non-functional testing is used to test non-functional aspects of the software like to test the systems performance under different conditions , how it works when too many users are using it etc.

  16. Functional testing:it is a process of testing all the functions of the software application.it checks the quality of the software.it does not test a module or method of a program.it tests the part of functions of whole system.testing each functionality detail and in depth with different steps and data.
    Non Functional testing:Non functional testing tests on non functional aspects of application software like performance of the software under different conditions like Reliability,usability,efficiency,maintainability etc.,

  17. Functional Testing

    In functions testing system program code is not necessary.Its like black box testing.It works completely on the behavior of the program.It checks the user is comfortable,efficiency with the function of the software work in the screen without any difficulty.It checks defects and provides the better access in the application.
    Non functional Testing
    Non Functional works for non-functional activity of an application.Non fictional tester on non functional aspects of the application sofware like the performance of the software under different condition.where the software works efficiently
    when to may user logging in.

  18. Functional testing is a software testing where tester check an application of the software works efficiently or as per expected result e.g login/sign in/out functionality. Non functional Testing is testing in which the behavior of the software are tested e.g software/system can handle the stress of the users.

  19. The functional testing is a process of testing all the functions of a software application.It efficiently checks the errors in the application and provides better access to defects.
    The Non functional testing tests on non functional aspects of the application software like the performance of the software under different conditions, whether the software can handle stress, whether it works efficiently with too many users.

  20. Functional Testing strictly tests all the functions in an application such as login, password, enter all are working ok as per requirements. Non- functional testing involves checking the functionality on how the application will perform under heavy load of users.

  21. Functional testing is to check the functionality of he software application while non functional testing is to check the performance of the software, usability, whether software can handle stress, software efficiency etc.

  22. 1. Identify the difference between functional and non functional testing.

    Ans1.
    As we know in testing level we have differnt types of testing.
    Like static testing and Dynamic testing.
    Under Dynamic testing we have black box testing and whitebox testing.
    Functional testing comes under Black box testing and called system testing which is done by QA.
    So as we all know sytem testing in done by QA before the software is deployed to the client so that it is free from any defects.Hence meet the clients requirements.For example one of the the telecom giant of USA At&T ,wants its web page of At& T to be deveoped which have different funcionality like register,login,under my At&T to be tested before user can use it.
    The funtionality is the features that can perform certain task.Like to search in At&T site we use search functionality.
    So to test ecah and every functionality if its working properly we do testing and it is called functional testing.So we conduct indepth and detail testing of all the functionality of AT&T web page.

    Non Functional Testing:-
    In non funtional testing we test all the non-functional aspects of the software like performance,usability, reliability etc.
    In performcae testing we test 1. speed/efficiency2.users 3. data, 4. Resources, 5. usage.So we perform load testing with different number of users.Identify maximum number of users required by the software.e.g online shopping sites-there are many usera so speed of the software gets effected.
    Data-We perform here volume testing,we test the performance of the software with different volumes of data and identify maximum volume of data supported by the software.e.g mobile phone ,if loaded with too many application then speed gets reduces or performance gets effected.
    Resources-We perform stress testing.We test the performance of the software with different number of resources and identify the number of resources required by the software. e.g Identify the number of servers(resources) required by the software.
    Usage- We call it Soak testing.The test performance of the software with different number of users with volume of data and observe software performance under continuous usage.
    There are other testing done to check the security,compatibility,reliability etc.

  23. 1. Identify the difference between functional and non functional testing.

    Ans1.
    As we know in testing level we have different types of testing.
    Like static testing and Dynamic testing.
    Under Dynamic testing we have black box testing and White box testing.
    Functional testing comes under Black box testing and called system testing which is done by QA.
    So as we all know system testing in done by QA before the software is deployed to the client so that it is free from any defects. Hence meet the client’s requirements. For example one of the telecom giant of USA At&T ,wants its web page of At& T to be developed which have different functionality like register,login,under my At&T to be tested before user can use it.
    The functionality is the features that can perform certain task.Like to search in At&T site we use search functionality.
    So to test each and every functionality if its working properly we do testing and it is called functional testing. So we conduct in-depth and detail testing of all the functionality of AT&T web page.

    Non Functional Testing:-
    In nonfunctional testing we test all the non-functional aspects of the software like performance, usability, reliability etc.
    In performance testing we test
    1. Speed/efficiency
    2. Users
    3. Data,
    4. Resources,
    5. Usage.

    Speed/efficiency:-So we perform load testing with different number of users. Identify maximum number of users required by the software, e.g. online shopping sites-there are many users so speed of the software gets effected.
    Data-We perform here volume testing, we test the performance of the software with different volumes of data and identify maximum volume of data supported by the software.e.g mobile phone ,if loaded with too many application then speed gets reduces or performance gets effected.
    Resources-We perform stress testing.We test the performance of the software with different number of resources and identify the number of resources required by the software. e.g Identify the number of servers(resources) required by the software.
    Usage- We call it Soak testing. The test performance of the software with different number of users with volume of data and observe software performance under continuous usage.

    Q2.. Give an example for each of the non functional characteristics of the software

    Ans2.
    As a QA it is our job to perform system testing so that the software developed by professional software developer are free from defects and not only that it should meet the client’s requirements.
    The non-functional characteristics (e.g. Reliability,usability,efficiency,maintainability and portability)
    Reliability:- Means the stable behaviour of the software or consistent output of the software.
    Usability:- User friendliness of the Software.The software can be used by layman i.e. user friendly.
    Efficiency:- It is the Speed of the software.
    Maintainability;- Means while the users is using the software they should not get any kind of technical issues.
    Portability:- Software is usuable on different system e.g go to meeting some of us logged in with smart phone,laptop,Mac etc with different configuration too and it should be portable with any device irrespective of what ever configurations.

  24. Functional testing is a type of testing in which different functions of the software is tested by putting data. While non functional testing is related to the performance of the software.

  25. DIFFERENCE BETWEEN FUNCTIONAL TESTING AND NON FUNCTIONAL TESTING:
    Functional Testing: This testing check all the functions of the software. It test the certain input data and their results. It does not test method of the software and this testing does not require any code for test. It
    Non functional Testing: This kind of testing test the software is able to work in differ environment or can handle the stress. Software can perform with multi users or not these kinds of tests are done in this testing.

  26. Difference between Functional and Non Functional Testing:
    The functional testing is process of testing all the functions of the software application. Functional testing is black box testing.
    In this testing software program code is not necessary. It checks the errors in the application and provides access to the defects.
    And the Non Functional testing works on non functional activities of an application. It tests the performance of software under different conditions like stress and load etc…. Non Functional testing should perform after functional testing is done.

  27. functional testing : This type of testing comes under black box testing where the functionality of the software is tested.it doesn’t require any code to test .
    Non functional testing: this type of testing test the non functional aspect of the software like performance, reliability , usage .

  28. There are two types of software testing
    1. Functional Testing : where all the functions of a software are tested. It is a type of black box testing. This testing doesn’t need code & works on the behavior of the program. It checks whether the user is comfortable with the functions of the software and can efficiently work on the screen without any difficulty.
    2. Non Functional Testing: which tests non functional aspects of the application software like the performance of the software under different conditions, whether the software can handle stress, whether it works efficiently when too many users are logged in etc.

  29. The functional testing is a process of testing all the functions of a software application. it checks the quality of the software it is a type of black box testing functional testing does not test a module or method of program functional testing system program code is not necessary.
    Non-functional testing works for non-functional activities of an application. non-functional testing tests on aspects of the application software like the performance of the software.

  30. Functional testing is type of a Back Box testing that focuses on testing main functions of a software. It checks whether the user is comfortable with the functions of the software and can efficiently work on the screen without any difficulty. It efficiently checks the errors in the application and provides better access to defects. In functional testing program code is not necessary. It completely works on the behaviour of the program. Example : Given the extension code of the phone number output : it displays the list of countries.
    Non Functional Testing: Non functional testing focuses on non functional aspects of the application software like the performance of the software under different conditions, whether the software can handle stress, whether it works efficiently when too many users are logged in etc. working on the non requirement aspects of the customer is what is called as non functional testing.A good example of non-functional test would be to check how many people can simultaneously login into a software.

  31. Functional testing is a type of testing which verifies that each function of the software application operates in conformance with the requirement specification. This testing mainly involves black box testing, and it is not concerned about the source code of the application.
    Non-functional testing is a type of testing to check non-functional aspects (performance, usability, reliability, etc.) of a software application. It is explicitly designed to test the readiness of a system as per nonfunctional parameters which are never addressed by functional testing.
    A good example of non-functional test would be to check how many people can simultaneously login into a software.
    Non-functional testing is equally important as functional testing and affects client satisfaction.

  32. 1. Identify the difference between functional and non functional testing
    Functional testing :
    It is a type of testing which verifies that each function of the software application operates in conformance with the requirement specification. This testing mainly involves black box testing, and it is not concerned about the source code of the application.Every functionality of the system is tested by providing appropriate input, verifying the output and comparing the actual results with the expected results. This testing involves checking of User Interface, APIs, Database, security, client/ server applications and functionality of the Application Under Test.
    2.Non-functional testing :
    It is a type of testing to check non-functional aspects of a software application like performance, usability, reliability, maintainability, portability etc. It is performed after the functional testing. It focusses on customer’s expectation. It is done to validate the performance of the software. It describes how the product works

    2. Give an example for each of the non functional characteristics of the software.
    Example for Maintainability:
    For an application with aniticipated load of around 1000 users. We will test to determine how the application will behave at the expected peak load and if the software does not pose any technical issues while the users use the software.
    Example for Reliability:
    For an application with anticipated load of 1000 users we will run the test with for 1200 users and check if the application is robust enough to not fail meaning it should provide the stable outcome without any ambiguity.
    Example for Efficiency:
    For an application with multiple users we will run the test with for each user and check if the software have a low response time i.e. it is quick in responding to the user requests.
    Example for User friendly:
    For an application with multiple users we will run the test to calculate the learning time ie. we will check if the software is easy to learn and handled by the common user.
    Example for Portability:
    For the developed software, we will browse and use it on various devices like computers, smart phones, tablets with variety of operating systems, browsers, processors, memory, user settings etc. The portable software is usable on all the different devices used by users.

  33. The difference between functional and non-functional testing:
    Functional testing is a testing all the functions of a software application, or the quality of the software itself. It tests functions of the whole system, but doesn’t test a module or method of a program. This type of testing works on the behavior of the program, so system program code is not necessary.
    Non-functional testing tests the performance of the software under various conditions, such as; if it can handle stress, if it functions properly when too many users are logged in, etc.

    Maintainability: A social media site should be up and running with no issues
    Reliability: When a link is tab is clicked on in a social media page, it should open with a positive outcome
    Efficiency:A website shouldn’t slow me down by having issues.
    User friendly: As I navigate a website, it should not take more steps than needed to reach my destination
    Portability: I should be able to open my bank account on my phone, tablet, or computer on a variety of different browsers.

  34. 1) Functional testing revolves around the functional aspects of the software system and how efficiently the system executes its functions. Non functional testing tests the productivity, quality, stress of the system, specifically from the user’s perspective. For example, functional testing might reveal the test for inputting data and its expected behaviour, whereas non-functional testing reveals the time taken for a document to get saved. Therefore, non-functional testing demonstrates how the system behaves as compared to what the system is expected.
    Functional testing measures functional requirements in simple yes/no terms as either present or absent in the completed system. Non functional testing measures non functional requirements on some scale or interval.
    2) The following are examples of the different non functional characteristics of the software:
    • Maintainability – The software should be easy to maintain, update so that the user can work without any hindrance. Ex: There are several quiz and gaming apps which are updated and any bugs or defects in the apps are fixed in the background constantly without the user’s knowledge. If the app keeps having problems the user will lose interest in the app.
    • Reliability – The software should be reliable and consistently provide the same results.
    • Efficiency – If a search engine takes too much time to deliver results, the user will be frustrated. Hence a software should have a low response time ie be quick in responding to user queries.
    • User Friendly – The software should be easy to navigate and a user must not spend a lot of time searching for any item on the site. This holds especially true for websites of e commerce giants like Amazon, Walmart, or banks and online travel booking sites.
    • Portability – A software that is portable can be used on different devices like computers, smart phones, tablets with variety of operating systems, browsers, processors, memory, user settings etc. Eg: several educational softwares can be browsed on websites as well as smartphones like abcmouse.com or khanacademy.com

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