What does 'Sanity Testing' focus on?

Sanity testing is a software testing process that specifically focuses on verifying that a particular function or a set of functionalities in a software application is working as expected, especially after changes such as bug fixes or enhancements. The main goal of sanity testing is to ensure that the issues identified previously have been resolved and that the changes did not introduce new errors.

This type of testing is usually a narrow and shallow approach, targeting specific areas of the software rather than evaluating the entire system. It’s often conducted after receiving a new build, to ascertain that the critical functionalities are still operational before proceeding to more extensive testing procedures.

In contrast to the other options, which describe broader or different aspects of testing, sanity testing does not involve comprehensive system reviews, overall performance assessments, or thorough regression testing. It is a quick check to ensure that a specific issue has been fixed and that the affected functionality is stable, establishing a foundation for further testing activities.