Functional Testing

Functional testing can be done at different stages of the software development life cycle (SDLC) including unit testing, integration testing, system testing, and acceptance testing. The focus of functional testing is on testing the behaviour of the software in response to different inputs, the interactions between different system components, and the overall functionality of the system.

Functional testing is an essential part of the software testing process as it helps to ensure that the software product or application meets the business requirements and is fit for purpose. It is important to have a comprehensive test plan that covers all the functional requirements and ensures that the software behaves as expected in different scenarios.


Approach

Functional testing includes a variety of techniques such as black box testing, white box testing, manual testing, and automated testing. Black box testing focuses on testing the system without any knowledge of the internal workings of the application. White box testing, on the other hand, focuses on testing the internal workings of the application. Manual testing involves human testers who manually execute the test cases, while automated testing involves the use of software tools to execute the tests automatically.



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Tools

There are many functional testing tools available in the market. Here are some of the popular functional testing tools:

HP UFT is a commercial functional testing tool that supports web, mobile, desktop, and API testing. It has an integrated development environment (IDE) that allows testers to create automated test scripts easily. TestComplete is a functional testing tool that supports web, mobile, and desktop application testing. It provides a record and playback feature that allows testers to create automated test scripts quickly. Ranorex is a functional testing tool that supports web, desktop, and mobile application testing. It provides a codeless test automation approach that allows testers to create test scripts without writing any code.

Selenium is an open-source functional testing tool that is widely used for web application testing. Apache JMeter is an open-source functional testing tool that is widely used for load testing, performance testing, and functional testing of web applications. Katalon Studio is a functional testing tool that supports web, mobile, and API testing. It provides a simple and easy-to-use interface that allows testers to create test scripts quickly. Telerik Test Studio is a functional testing tool that supports web, desktop, and mobile application testing. It provides a record and playback feature that allows testers to create automated test scripts easily. These are just some examples of functional testing tools available in the market. When choosing a functional testing tool, it's important to consider factors such as the application under test, the team's skills and experience, and the budget available for the tool.