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Software regression is a bug that causes software to regress in one or more areas. There are two types: functional and non-functional. An event, such as an update, is usually the cause. Regression testing checks for regression and ensures all coding is functional.
Software regression is a bug in software programming that effectively causes software to regress in one or more areas. There are two main types of software regression: functional and non-functional. Functional means that the program runs at the correct speed but one or more functions fail, while non-functional means that all functions work, but the speed is drastically reduced. An event, such as an update, is usually the cause of the regression. Regression testing checks the software to ensure that no regression occurs or occurs.
Functional software regression is one way that program regression can manifest itself. When this occurs, the program will continue to run at full speed, so the user may not notice the regression at first. In this manifestation there are some functions that no longer work. For example, if a program can search for files, that function may no longer work. This may affect ancillary functions, those not commonly used, or the main function of the program.
Non-functional software regression is more dangerous and easier to notice, even if all functions continue to work. In this manifestation, the regression slows down program execution or the program output will be significantly lower. The lack of speed means that the program can also become vulnerable to malicious code and attacks, putting both the program and the computer it is running on at risk of hacking. The speed can become so slow that it may be impossible to use the program.
For software regression to occur, a so-called event must occur. This event changes the coding of the software and introduces these bugs, either intentionally, which is rare, or unintentionally. The developer might try to fix a bug or update the version but mistakenly introduces code that makes the program regress. The most typical event is an update, because it directly affects program coding. Other events include version or configuration changes.
To alleviate the chances of software regression, regression testing is usually employed. This type of test looks at the new program and compares it to all the old versions of the program. It then runs the programming through a test to see if there is any sign of regression and to ensure all coding is functional. Any signs of regressed or broken code will be reported to the developer or user and report what regressed or where the regression is.
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