regressiotestien

Regression testing is a type of software testing that ensures that recent changes to a software application do not adversely affect existing functionality. It is typically performed after a software update, bug fix, or new feature addition. The primary goal of regression testing is to confirm that the software behaves as expected and that no new defects have been introduced.

Regression testing can be manual or automated. Manual regression testing involves a tester manually executing test cases to verify the software's functionality. Automated regression testing, on the other hand, uses scripts or tools to automatically execute test cases, which can be more efficient and less error-prone.

There are several types of regression testing, including:

1. Retest all: This approach involves re-executing all test cases to ensure that the software behaves as expected.

2. Regression test selection: This approach involves selecting a subset of test cases that are most likely to be affected by the changes made to the software.

3. Prioritized regression test selection: This approach involves prioritizing test cases based on their importance or the likelihood of being affected by the changes made to the software.

Regression testing is an essential part of the software development lifecycle, as it helps to ensure that the software remains stable and reliable over time. It is typically performed in conjunction with other types of testing, such as functional testing, performance testing, and security testing.