Regression testing plays a crucial part in software development and testing. It entails rerunning previously completed tests to make sure that following software modifications, the functionality still functions as intended. Here are 5 key things testers should check during regression testing in software testing:

1. Check Previous Functionality
   Regression testing is mostly used to confirm that modified functionality continues to perform as intended. It is necessary for testers to re-run all previously completed tests on the previous version of the program and verify they passed. This covers every test imaginable, from high-level graphical user interfaces and workflow testing to low-level unit, integration, and system tests. Retesting every module, feature, and flow that was previously functional is necessary to make sure no regressions have been added.

2. Check New Features
   
   Adding new features or activities to the system frequently has unintentional consequences, such as breaking unrelated things. Regression testing on the balance of the system is also crucial when testing upgrades, along with testing the function alone. Testing new features extensively with positive and negative test cases is critical, but also verifying old, unrelated features still work properly is equally important in regression testing. New code can surface hidden defects in old code. Regression testing helps confirm that existing flows remain intact.

3. Check Related Functions
   Often, in software, functions are interdependent and interlinked. So even if you change one small thing, it can snowball and impact several other modules or programs. Regression testing should cover related functions that could potentially be affected by the code change. Knowing the dependencies and relationships between different components helps testers identify areas that need more extensive regression testing.

4. Check Edge Cases
   Most software problems and defects are uncovered not in happy path scenarios, but in edge cases. When changes are made to code, it can reveal or introduce problems during boundary conditions or outlier use cases. Regression testing should explicitly include tests for edge cases like max load, error conditions, low resources, race conditions, etc. to catch defects other tests would miss.

5. Check User Journeys
   End-user workflows matter most. Regression test suites should contain automated user scenarios and journeys to verify that the most important workflows are still functioning seamlessly for the end user. Testing the application flow from end to end rather than just individual functions mimics real-world usage and can catch integration issues.

Conclusion

Regression testing is a safety net that prevents unintended consequences from changes made during development. Opkey’s no-code automation platform transforms manual tests into automated scripts with one click, enabling non-technical staff to intuitively build regression tests. Its library of 30,000+ pre-built test cases for over 12 ERPs instantly boosts coverage. Change impact analysis reports recommend and prioritize tests based on application changes. Self-healing scripts fix failures automatically, cutting maintenance by 80%. End-to-end testing ensures integrations and customizations work after each update. Just Group reduced testing cycles by 68% and gained optimal coverage after switching to Opkey. They guide companies to slash costs, effort, and time for regression testing.