Any kind of software testing which searches to discover new bugs or regressions in an ongoing program or application after amendments were made to it as a part of purposeful development or patch is known as Regression Testing in Software Development.
Regression testing concentrates on detecting flaws after changes are made to the main coding of software. It functions to reveal software failures as well expose old bugs that reappear.
Software regression takes place when the applications that were functioning properly suddenly stop its normal operation. Usually, such breakdown or regressions crop up uninvited when the existing programs are updated with newer versions.
The coding in the new version of the software fails to operate in the desired manner when it integrates with the previous version’s code.
General techniques of regression testing in software development comprises of repeating tests that were formerly performed on the software and observe to see if the software glitches that were resolved earlier have recurred.
The intensity of the testing is determined based on the stage of the software release and the risk involved in the updated features.
For example : to enable your Windows operating system to run smoothly and securely, Microsoft releases software patches to incorporate latest security updates, performance enhancement and feature enrichment.
Such patches undergo extensive regression testing to check if the software operates efficiently in conjunction with all the software and hardware that are installed on windows.
This process holds true for all operating systems, software programs or applications and includes updating mobile phone firmware as well.
In the business world, software regression testing has been conducted since a long time by a team of software quality assurance after the software developers finish their task of building the software.
The glitches detected during this phase involve lot of expenses. This issue is currently being attended to by the unit testing.
As a component of the development cycle, the developers write test cases however; these cases are usually unit tests or functional tests that authenticate the planned outcome only.
The developer mainly concentrates on unit based testing and consists of positive as well as negative test cases. Functional tests are carried out on the entire program using numerous inputs whereas; unit tests are carried out on single functions.
Regression testing is performed not only to verify the precision of the program, but also to monitor the quality of its functionality.
For example, after creating compiler software, regression testing is done to check extent of the code, time taken for simulation and test suite cases.
The regression test suite covers three special modules of test cases:
a) A mock test of a replica of the actual software that has all the functions of the real software.
b) Further tests on the functioning of the software that can possibly be influenced by any alteration.
c) Tests that concentrates on the specific software sections that are modified.
Though regression tests can be executed via manual testing methods by employing software programming procedures, it is also performed by means of automated testing software or tools.
An automated test suite has a software tool that lets the testing mechanism to complete the regression testing in software development automatically.
Programming projects are often connected to automate systems that run the regression tests after a specified period of time (daily, weekly, monthly and so on) and highlight software malfunctions.
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