Functional Testing vs Non-Functional Testing

Functional Testing Vs Non Functional Testing

In this tutorial, we will learn the Functional Testing vs Non-Functional Testing in detail. 

What is Functional Testing?

Functional testing is a type of software testing which is to verify that each function of the software application behaves as specified in the requirement document. It tests all the functionalities by providing appropriate input to verify whether the actual output is matching the expected output or not. Testers who do functional testing focuses mainly on black-box testing and need not concern about the application source code.

It falls within the scope of black-box testing and the testers need not concern about the source code of the application.

In simple words, what the system actually does is functional testing.

Learn more about Functional Testing in detail here.

Also, check out these best functional testing tools which help you in achieving the best results while doing functional testing. 

What is Non-functional Testing?

Non-functional testing is a type of software testing which refers to various aspects of the software such as performance, load, stress, scalability, security, compatibility, etc., The main focus of non-functional testing is to improve the user experience on how fast the system responds to a request.

It checks the attributes such as memory leaks, performance, or robustness of the system.

In simple words, how well the system performs is non-functionality testing.

Check out these Performance Testing tools, Security Testing tools which help you in achieving the best results while doing Performance and Security testing.

What is the difference between Functional and Non-functional testing?

Both functional and non-functional testing is equally important and affects client satisfaction. So development teams should consider both these testing types with equal importance.

Functional TestingNon-functional Testing
What the system actually does is functional testingHow well the system performs is non-functionality testing
To ensure that your product meets customer and business requirements and doesn’t have any major bugsTo ensure that the product stands up to customer expectations
To verify the accuracy of the software against expected outputTo verify the behavior of the software at various load conditions
It is performed before non-functional testingIt is performed after functional testing
Example of functional test case is to verify the login functionalityExample of non-functional test case is to check whether the homepage is loading in less than 2 seconds
Testing types are
• Unit testing
• Smoke testing
• User Acceptance
• Integration Testing
• Regression testing
• Localization
• Globalization
• Interoperability
Testing types are
• Performance Testing
• Volume Testing
• Scalability
• Usability Testing
• Load Testing
• Stress Testing
• Compliance Testing
• Portability Testing
• Disaster Recover Testing
It can be performed either manual or automated wayIt can be performed efficiently if automated

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