Which term refers to the ability to test individual modules in isolation?

The term that refers to the ability to test individual modules in isolation is unit testing. Unit testing focuses on validating the smallest parts of the software, such as functions or methods, to ensure that they are working correctly on their own. This approach allows developers to identify and resolve issues at an early stage of development, minimizing risks when integrating these modules into a larger system.

Unit tests are typically automated, allowing for efficient and continuous testing during the development process. By isolating individual modules, unit testing ensures that changes or failures in one module do not affect others, promoting better code quality and maintainability. This early detection of bugs and functionality verification is vital to the overall software development lifecycle.