What term refers to the process of verifying that modifications have not adversely affected existing features?

The process of verifying that modifications have not adversely affected existing features is known as regression testing. This type of testing is crucial whenever changes are made to the software, such as bug fixes, enhancements, or the addition of new features. The primary goal of regression testing is to ensure that the existing functionality continues to work as intended after the changes have been implemented.

Regression testing involves re-running previously completed tests to identify any defects in unchanged areas of the application that could have been inadvertently introduced by the changes. This is particularly important in complex systems where impacts may not always be obvious.

The other options refer to different testing purposes: confirmation testing focuses specifically on verifying that fixes to defects work correctly, integration testing examines the interactions between different components or systems, and acceptance testing assesses whether the system meets the business requirements and is ready for deployment. Each of these serves a different role in the software development lifecycle but does not specifically address the preservation of existing functionality in the face of new changes, making regression testing the correct term for this scenario.