What is the main goal of unit testing?

The main goal of unit testing is to validate individual components of the software. This process involves testing the smallest parts of an application, typically individual functions or methods, to ensure that each one behaves as expected when given a set of inputs. By isolating these components, developers can identify and fix issues at an early stage of development, which promotes a higher level of quality and reliability in the software product.

When each unit is shown to work correctly, it provides a foundation for establishing that the entire application will function properly when these units are combined. This ensures that potential defects are caught early, which can save time and reduce costs in the long run.