What is regression testing?

Answer1:
The selective retesting of a software system that has been modified to ensure that any bugs have been fixed and that no other previously working functions have failed as a result of the reparations and that newly added features have not created problems with previous versions of the software. Also referred to as verification testing, regression testing is initiated after a programmer has attempted to fix a recognized problem or has added source code to a program that may have inadvertently introduced errors. It is a quality control measure to ensure that the newly modified code still complies with its specified requirements and that unmodified code has not been affected by the maintenance activity.

Answer2:
Regression testing is the process of testing changes to computer programs to make sure that the older programming still works with the new changes. Regression testing is a normal part of the program development process and, in larger companies, is done by code testing specialists. Test department coders develop code test scenarios and exercises that will test new units of code after they have been written. These test cases form what becomes the test bucket. Before a new version of a software product is released, the old test cases are run against the new version to make sure that all the old capabilities still work. The reason they might not work is because changing or adding new code to a program can easily introduce errors intocode that is not intended to be changed.

Answer3:

In software development, testing a program that has been modified in order to ensure that additional bugs have not been introduced. When a program is enhanced, testing is often done only on the new features. However, adding source code to a program often introduces errors in other routines, and many of the old and stable functions must be retested along with the new ones. Regression testing is one of the most important aspects of software testing and is often overlooked or given scant attention.