Impact and Influence of Regression Testing

Within Software Testing, Regression testing is used to ensure previously developed and tested software still operates correctly after changes are applied. Regress is defined as ‘to go back’ or ‘movement to a previous state or condition.’ Some of the different types of changes that may require regression testing include bug fixes, enhancements, new features, configuration changes, API (Application Programming Interface) modifications, hardware firmware, or hardware components. Regression testing can be both functional and non-functional; where functional testing is looking at slices or specific behaviors inside a system, and non-functional testing looks at the way a whole system operates. Additionally, regression testing can be performed both manually or automatically; where manual requires a tester to test the software for defects, and automated requires the use of separate software, different from the software being tested, to control the execution of tests and outcomes.

As an example of a functional regression test, a change to the behavior of password security would require full testing of the previous password security functionality, as well as the change, to ensure either way will work. As an example of a non-functional regression test, overall system performance can be tested to ensure that it still operates within the allowable tolerances for stability and responsiveness, as it previously did. Again, both types of tests could be performed manually or via automation.

In an Agile software development environment, regression testing can be applied by both QA testers and developers as part of their organization’s Software Development Life Cycle (SDLC). Regression testing has traditionally been performed by the QA team after the development team has completed their work; however, developers may also conduct regression testing to help remove defects during the development cycle. QA testers and developers may use different techniques for these tests, which can complement one another and improve the overall quality of the released software.

To take full advantage of regression testing benefits, it can be performed at the time a change is made, as well as at the end of the development cycle, prior to being released into production. It validates accuracy, stability, and responsiveness throughout the development cycle. It can be accomplished through several different approaches. Some of the drawbacks, related to Agile software development, could include overuse of development resources due to short and frequent development life cycles. Also, regression testing might be somewhat more difficult when used against Black Box or Third-Party software components with a limited span of control.

As the need for faster and more frequent software releases grows, regression testing plays an integral role in the Continuous Integration (CI) of software changes. The benefits of having regression testing significantly outweigh the drawbacks, playing a key role helping to ensure the overall stability and performance of the software. The only constant in software development is change, so it’s imperative for testers, developers, and other stakeholders to incorporate and apply regression tests to help prevent the emergence or re-emergence of defects into production systems.

About Automated Systems, Inc.
Since 1981, Automated Systems, Inc. has been a leader in providing innovative core banking, digital banking, and data processing solutions to community banks nationwide.  An array of integrated applications provide partnered banks with tailored, cost-effective, competitive choices.  ASI delivers industry-leading technology backed by unparalleled in-house conversion, training and support teams; paving the way for progressive, top-notch customer service.  ASI corporate headquarters are located at 1201 Libra Drive, Lincoln, NE 68512, 1.800.279.7312.  For more information about banking solutions from ASI, visit

About Insite Data Services
IDS data application hosting services combines secure and cost-effective core banking applications, enterprise-class servers and storage, and proven virtualization technology.  IDS hosts all of the bank’s servers in secure data centers that use state of the art security systems including identity verification and biometric scanning.  Insite Data Services also offers IDS On-Time, a full-service solution dedicated to back-office bank processing.  These operations experts allow partnered banks to focus on their most important asset, their customers.  For more information visit


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