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Regression testing is a necessary component to any software development lifecycle. The process involves testing of the changes, error corrections, optimization, and deletion of invalid features in the software layout that has been recently modified or enhanced with patches, configuration and so on. The action ensures about the older programs that were once developed and tested are still working despite of being altered or interfaced with some other software. Today, Regression testing is widely conducted across the global enterprises who're fully aware of the Software Testing Fundamentals in order to get started. Regression testing is the next step ahead of re-testing or repeat testing that uncovers new software bugs, fix issues, and determines what other areas may be affected as a result of the transformation.
There's a general to Regression testing that includes Single Unit Regression, Partial Regression, Complete Regression, and Manual Regression testing that are conducted using the automated capture playback tools. However, here're the universally acclaimed Regression testing techniques you can best employ:
Corrective Regression Testing: As there're no changes in spec, the tests results are reused
Progressive Regression Testing: With the change of the spec, new checks are created
Retest-all-Strategy: This is a time-consuming procedure but makes use of the test results
Selective Strategy: Only those checks connected with the modified code are re-run
Of all the test cases, Sanity test cases are the most critical ones as they are capable of diagnosing the basic functionality of the system and helpful in checking stability
All modifications and additions of code are thoroughly analyzed, all test cases for Regression are prepared
Integration Test Cases designed for Regression testing are executed as per the bandwidth and requirement
The valuable test cases with multiple defects are chosen for execution. The aggressive tests are run for those units of code that are repeatedly altered
Regression testing exercise is conducted by expert Regression testers along with the code testing specialists during the Test department stage. The specialists use special techniques and apt test automation tools for executing Regression testing. Throughout the development process, they're involved in conducting series of full tests, partial tests, repeat tests, functional tests, unit tests, integration tests, verification tests et cetera for the accurate functioning of the software.
Conducting accurate Regression test is a good effort as it becomes mandatory with every change that has brought up in the program or code. Illustrated below are few of the privileges of using Regression testing:
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