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Difference Between Functional and Non Functional Testing

Functional and non functional testing techniques are the fundamentals for every software engineer and tester. In this article, we will break down the basics and their differences.

What is Functional Testing?

Functional testing is a type of software testing that ensures that each functional of the software application operates in conformance with the requirement specification. It is also known as functional testing. This test is usually performed by a software developer to verify that the code he has written meets the requirements. The purpose of functional testing is to identify if any possible defects exist in the basic functionality of an application.

It tests if an individual component or module works properly by exercising it as a user would do, but without considering other components/modules with which it depends or interacts. A functional test is a software testing process in which an application is tested for its basic functionality. This test is usually performed by a software developer to verify that the code he has written meets the requirements. It also checks for possible defects in the basic functionality of an application. Functional testing can be carried out manually or automated using tools and frameworks, such as Selenium, Robot Framework, and Appium.

Scope of Functional Testing

It verifies that every functional of an application works just as it is supposed to work. Example: To verify if the mobile phone call options like hold, call forward, mute, etc work. Functional Testing is normally more detailed than other forms of software testing like unit tests and integration tests because instead of just checking if a single unit works alone in isolation from other modules or parts of the system; Functional tests will also check how several units interact together for them to achieve their business goals.

What is Non-Functional Testing

Non-functional testing a.k.a non functional testing is a type of software testing that verifies non-functional requirements. These tests check various aspects like usability, load capacity, reliability, scalability, etc. These tests are usually carried out after functional tests to help ensure that functionality is satisfactory. Such tests check various aspects like Usability, Load Capacity, Reliability, Scalability, etc. You are probably wondering what non-functional testing is. In simple words, it is the process used to ensure that the software or application meets its requirements and performs as expected. 

Both Functional and Non Functional test have their own scopes in a software development. This non functional should be performed by an independent team of testers who do not participate in other testing activities. It concentrates on aspects such as performance and behavior under heavy load. * Stress Testing – this test involves stressing a system or application beyond its normal capacity (e.g., by increasing CPU usage). It can reveal bugs that would not be found during normal use or load testing because they only occur when conditions are abnormal.* Security Testing – this type of testing checks for compliance with security policies, standards, and regulations as well as detecting vulnerabilities.* Compatibility Testing – this type of testing ensures that an application will run properly on all supported platforms (operating systems) and browsers.* User Acceptance Testing (UAT) – this type of testing includes both functional and non-functional requirements; it is performed after development has been completed so that users can determine whether or not the product meets their expectations about functional before being released

Functional vs Non Functional: What’re The Differences?

Functional testing verifies functional requirements and non-functional testing checks non-functional requirements. It is a type of software testing that verifies the performance and scalability of the application in terms of its ability to handle multiple users at once or be able to provide the same experience across all devices or provide the same results when retrieved from different locations around the world. It’s important to note that this type of testing doesn't always have a direct impact on whether or not an application meets its customers' needs; it's just as important for an application to work as expected when run on different computers with different specifications, even if those specifications don't match what customers will use. Functional and non functional are done in all software development projects and can’t be ignored.

Summing up: 

To be everything in one sentence, functional and non functional testing work in two dimensions: functional testing for “functionals” of the software while the non-functional checks the “performance” for real-world usage. 

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