Regression testing is a type of software testing used to determine whether new problems are the result of software changes. Before applying a change, a program is tested. After a change is applied, the program is retested in selected areas to detect whether the change created new bugs or issues, or if the actual change achieved its intended purpose.

Regression testing ensures that any change in the source code or program doesn’t affect the existing features of the software application. It is basically selecting test cases that are fully or partially executed before. So, basically this ensures with every new change or introduction of new codes, the old code still works.

When is Regression Testing Required?

Regression testing is required in the following scenarios.

  • When the code is modified according to the change of need in the requirement

  • When a new functionality is added

  • While fixing defects

  • While fixing performance issues

Regression testing involves testing the unchanged parts of an app again and again. It ensures that the previous functionality of an application is working as intended and the new feature that has been added doesn’t introduce any new bug or error. This is basically a process of verification.

Regression testing is started as soon as the programmer adds a new functionality to an application or fixes any bug. This is because of the dependency between the newly added and previous functionality. This testing/verification hold immense importance, especially when there are continuous changes or improvement in the application.

Regression Testing Strategy

The amount of regression testing required depends upon the newly added feature. If the feature is large, then there are more chances of the application getting affected. So, testing must be performed thoroughly considering all the test cases.

Depending upon the inputs gathered by the tester, regression testing can be automated using selenium so that the test cases can be easily executed in a new build. When the test scope is large then selective tests are executed to save cost and time. Regression testing is basically performed to:

  • Re-execute the previously performed tests

  • Compare the current results with the previous results

These are performed at various stages continuously throughout the software testing lifecycle. The best way is to perform regression testing after the sanity or smoke testing. An effective test plan must be created to outline the regression testing strategy and exit criteria. Performance testing can also be done to ensure optimum system performance.

Regression Testing Best Practices

  • Formulate a policy on a regular basis for regression testing

  • Perform desired action and check expected response for correctness

  • Regression test must not be outdated and must be correct

  • Analyze defect escaping detection during the process

  • Should create a logical batch of test cases instead of having one large regression test

  • Test suites must be designed on the basis of 80/20 principle of management

  • Perform regression testing after every successful compile for smaller projects

  • Design regression testing based on the risk factors across the business

  • Identify application area with high risk of failure

  • Link regression testing with functional testing

  • Re-run successful functional test cases

  • Regression testing must be considered as an integral part of extreme programming method

Regression Testing Framework

When it comes to automated regression testing, architecture plays various key roles.

  • An appropriate structure to manage the regression tests, including test suites and test cases

  • An appropriate tool and medium to store and maintain these structured regression tests

  • An appropriate UI for QA analyst

  • Generic script that drives the required Test Suite and runs the tests

  • Ability to define a migration path through the application lifecycle.

360logica has the proficiency to manage the astounding task in regression testing to make the process seamless and error free. Testing objectives are duly defined at each stage, including project manager and test engineer level, which guarantees success. We have the expertise to understand software applications and formulate a rational plan that fully complies with the client requirements. Our scientific and logical methodology helps us to draft all deliverable and dependencies. With our flexible and transparent approach, we are able to adapt quickly to modified deliverable and specifications. We have been winning client confidence through proactive communication through different mediums round-the-clock.

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