Software regression testing is carried out whenever an application bug reoccurs after making changes to the program. It is also applied if an application stops functioning or if its behavior changes. Normally, these bugs can be resolved by writing bug fixes or patches. The codes then will be logged so that software quality controllers can run tests the will determine if the bug will reappear or not. Patches however can sometimes be corrupted especially if the software will undergo an upgrade. That is why software developers are usually performing regular regression testing to ensure the integrity of the entire software build.
Software regression testing is an integral part of application quality assurance. Bugs are common features of an application and they will always occur during the lifetime of the software. It should be noted that most computer program commands are executed manually by end users. Sometimes users can make bad commands or they could interrupt the normal processes of the application. Over long period of use, these bad command executions can undermine software integrity thus resulting to code corruption and the appearance of bugs. Fortunately, almost all software has the capability to record error events. These then can be used by software developers in creating fixes.
Other software developers on the other hand create system wide fixes for known application bugs. This is a long term approach in resolving software issues. By utilizing this approach, developers conduct comprehensive software regression testing that tests the entire structure of the application code. The result of this kind of fix is usually a new version of the software or an upgraded edition of the current application.