The Fundamentals of Regression Testing


Testing new functionality of freshly released software is necessary, but there is more. As a leading Software Testing Company we also understand that re-running of tests that the software may have ‘passed’ previously is also equally important. This is necessary to validate that new software does not bring in previous or new defects or bugs in the existing system. This is the essence of regression testing – and we will discuss the fundamentals of this form of testing at some length. Regression Testing is a critical part of software testing services since it ensures that the software / application continues to function as it was meant to be even post updates, enhancements, or code changes.

Core of Regression Testing

Regression Testing is what determines whether the existing features are stable and whether their functionality is as expected. The aim of regression testing is to ensure that a system remains stable and workable even while continuous improvements are being applied. This form of testing mitigates the risks – defects, malfunctions, dependencies – such that previously tested code continues to work seamlessly even post changes. This testing is the final stage that verifies the overall ‘behavior’ of the product.

Benefits of Regression Testing

Given the critical nature of regression testing, it is important to discuss the benefits too:

  • 1. Increases the possibility of detecting bugs caused by changes to application or software
  • 2. Cost reduction since bugs are detected early
  • 3. Analyses poor side effects brought about by a new operating environment
  • 4. Early detection of bugs ensures that software works at a more efficient level
  • 5. Validates that code changes have not brought back previous defects
  • 6. Ensures ‘correctness’ of software such that a top quality product is released

It is important to know when to apply this form of testing since it is not feasible to maintain an almost limitless set of tests.

Applying Regression Testing

The following circumstances would warrant applying regression testing

  • 1. Existing feature is added with a new requirement
  • 2. Addition of a new functionality or feature
  • 3. Codebase fixed to resolve defects
  • 4. Optimization of source code to enhance performance
  • 5. Addition of patch fixes
  • 6. Alterations to configuration

Automated regression testing becomes a critical element in the overall aim of releasing a top quality product. Product teams benefit from this form of testing since they receive effective and usable feedback, to which they can respond instantaneously. Bugs are detected early on within the deployment cycle, saving big monies and efforts towards maintenance that would otherwise be spent on finding defects later on. The truth about defects is that even a seemingly minute bug can actually have a ripple effect and cause major problems with the functioning of the product – which is why expert testers never leave anything to chance. As a leading Software Testing Services Company we understand that regressing testing is not only more time-intensive, it is also a lot more challenging that most types of testing. Regression testing ensures that even if a product requires frequent updates and changes, the product will retain top quality.

Challenges of Regression Testing

While regression testing is extremely critical and necessary to the proper functioning and high quality of an application / software, there are some challenges to implementing them:

Time Intensive – Retesting all for example is time consuming as it tests the entire suite of test cases.

Costly – It requires a large amount of resources including human resources, to repeatedly test that which is already developed, tested, and deployed earlier on.

Difficult – The large number of test cases can be extremely intimidating for testers, and they could end up not keeping track of test cases.

In Conclusion

Despite the challenges that regression testing poses, we as a leading mobile app testing services company understand the critical nature, of this form of testing, and help companies by conducting it. In doing so, we ensure that projects remain within budgets and also that unforeseen bugs do not damage the product and their reputation. Connect with us to improve the overall quality of your product and to significantly enhance the user experience.


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