What is the Regression testing

Regression testing is a type of software testing that ensures that previously developed and tested software still performs the same way after it is changed or interfaced with other software. Changes may include software enhancements, patches, configuration changes, etc.

The purpose of regression testing is to ensure that changes such as those mentioned above have not introduced new faults. One of the main reasons for regression testing is to determine whether a change in one part of the software affects the software elsewhere.

This type of testing is essential for continuously improving and evolving software, and it is a critical component of the software development lifecycle.

Here are the steps involved in Regression Testing:

1. Once the software has been changed, identify the parts of the software that may be affected by the change.

2. Select the test cases that will verify whether these parts of the software still work as expected.

3. Execute these test cases.

4. If the test cases pass, the software is considered to have passed the regression test. If they fail, it means that the changes have introduced new faults into the software.

5. In the case of failure, the software must be adjusted and the regression test must be performed again until the software passes.