What Is Functional Testing? Types, Examples & Best Practices (2026)
Blog post from Keploy
Functional testing is a crucial software testing method that verifies whether each feature of an application operates according to specified requirements, focusing on user interactions and expected outcomes without examining the internal code. It is primarily a black-box testing approach aimed at ensuring user satisfaction and software reliability by confirming that applications behave as intended. Key steps in functional testing include understanding requirements, preparing test cases, setting up a testing environment, executing test cases, and logging defects for retesting and regression testing. Different types of functional testing, such as unit testing, integration testing, system testing, user acceptance testing, and smoke testing, cater to various stages of the development lifecycle. The process can be conducted manually or automated, with tools like Selenium, Keploy, and Appium facilitating the automation of repetitive tasks. Despite challenges like complex test scenarios and frequent changes, functional testing is essential for maintaining software quality and delivering a product that meets user and business expectations.
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