Regression Testing is a sort of software testing used to ensure that a recent program or code modification hasn't broken EXISTING functionality. Regression Testing is just a full or partial re-execution of previously EXECUTED test CASES to confirm that current functionality is working properly. This testing ensures that new code modifications do not have unintended consequences for current functionality. It ensures that the old code continues to function after the most recent code modifications have been made.

According to industry data, a large proportion of DEFECTS reported by customers were caused by last-minute bug patches that had unintended consequences, making selecting the Test Case for regression testing an art and not an easy task. The following test scenarios can be used to create effective regression tests :

• Test scenarios with a high NUMBER of flaws
• Test cases covering features that are more visible to the users
• Test cases that test the product's fundamental features
• Test cases of functionalities that have experienced significant and recent alterations
• All Test Cases for Integration
• All Complex Test Cases
• Cases of boundary value tests.