functional testing vs non-functional testing

Before we start Functional testing Vs Non-functional Testing, we have to discuss what is testing? Software testing is a process to check the actual software product is matched with the expected requirement and to ensure that the software product is bug-free. Software testing is a verified quality of the software product.

Software testing is categorized into two types Functional testing and non-functional testing.

We all are heard about testing type but here we are briefly discussing that so for this knowledge we are going to the blog.

What is Functional testing?

As per its name functional testing is to validate the software system against the functional requirement. The main use of functional testing is to check all functions of the application, by providing different inputs, and checking the output as per the functional requirement.

Functional testing is one type of black-box testing and it is not connected with the source code of the application. Functional testing can be done by manual testing or automation testing.

Functional testing also divides into two different parts first is white box testing and black-box testing.

What is Non-functional testing?

As per its name non-functional testing is checked the non-functional attributes like (performance, usability, reliability, etc.) for a particular product or software application.

Non-functional testing increases the security, usability, maintainability of the product. Non-functional testing supports reducing costs and risks related to non-functional elements of the product.

Non-Functional requirements also observe the behavior when a more number of people are using the product at the same time. At that time as we know that the servers are busy or unavailable because of heavy load (i.e. number of people are using it at the same time).

This testing can improve user-friendliness because that will have a large impact on the quality of the product.

Difference between Functional Testing Vs Non-functional Testing

Parameters Functional Testing Non-functional Testing
Execution First, perform functional testing before non-functional testing. Non-functional testing was performed after functional testing.
Focus area Functional testing is performed based on the customer’s needs. Non-functional testing was performed based on the customer’s expectations.
Requirement It is very simple to define requirements for functional testing. It is hard to define the requirements for non-functional testing.
Usage It is useful to validate the Action of the application. It is useful to validate the efficiency of the application.
Objective Carried out to validate software actions. It is done to validate the efficiency of the software.
Requirements Functional testing is implemented using the functional specification. Non-functional testing is implemented by performance specifications
Manual testing Functional testing is simple to execute using manual testing. It is very difficult to perform non-functional testing manually.
Functionality It represents what the Actual product does. It represents how the product behaves in every action.
Example Test Case Test login functionality. The login page should load in 2 seconds.
Testing Types Below Functional Testing Types includes

  • Unit testing
  • Smoke testing
  • User Acceptance
  • Integration Testing
  • Regression testing
  • Interface Testing
  • System Testing
  • Sanity Testing
Below Non-functional Testing Types includes

  • Performance Testing
  • Volume Testing
  • Scalability
  • Usability Testing
  • Load Testing
  • Stress Testing
  • Compliance Testing
  • Portability Testing
  • Disaster Recovery Testing
  • Security
  • Reliability
  • Survivability
  • Availability
  • Interoperability
  • Flexibility

Related Article: Functional Testing Types

Twisa Mistry

Twisa works as a Software Tester at QACraft. She is a Computer Engineer with a degree and she has 5+ years of experience in the QA field(Manual as well as Automation Testing). As an automation tester, she has good knowledge about Automation testing of web-based applications using selenium Webdriver. In her free time, she loves to explore new technologies.

https://qacraft.com/author/twisa-mistry/

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