Regression Testing Strategies

Overview

Regression testing is an important part of the software development lifecycle (SDLC). It ensures that recent changes to the code do not inadvertently break existing functionality. In other words, it prevents software regression. However, regression testing can be time-consuming and costly, so it is essential to have an effective regression testing strategy.

How To Perform Regression Test

Regression Test Techniques

1. Retest all
   This technique checks all the test cases on the current program to check its integrity. Though it is expensive as it needs to re-run all the cases, it ensures that there are no errors because of the modified code
2. Regression test selection
   This technique runs a part of the test suite (owing to the cost of retest all) if the cost of selecting the part of the test suite is less than the Retest all technique.
3. Test case prioritization
   Prioritize the test cases so as to increase a test suite’s rate of fault detection. Test case prioritization techniques schedule test cases so that the test cases that are higher in priority are executed before the test cases that have a lower priority.
4. Types of test case prioritization
   This regression testing technique allows you to choose the test cases that you should give the first priority in the testing process. The test cases are selected based on several factors, such as most commonly used functionalities, feature failure rate, and business impact of certain features. More so, newly-incorporated functionalities and customer-centric features are regarded as the highest priority test cases.
5. Hybrid
   This technique is a hybrid of regression test selection and test case prioritization.

Reasons For Regression Testing

Regression testing has many benefits, which is why it’s an essential part of the software development process.

• New Functionality: When developers introduce new code, they don’t always fully consider its compatibility with existing code. Regression testing ensures that old and new code coexist harmoniously.
• Functionality Revision: Sometimes, developers revise existing features, removing or modifying certain functionalities. Regression testing checks whether these changes impact the rest of the system.
• Integration: After integrating with another product or system, regression testing ensures flawless performance.
• Bug Fixes: Ironically, fixing one bug may introduce others. Regression testing is crucial after bug fixes to validate that the patched code doesn’t cause new issues.

Common regression testing mistakes

When it comes to regression testing, it’s essential to avoid mistakes to ensure the effectiveness of testing process. Here are a few errors that you can avoid making:

• Lack of planning: Without a plan, you may end up testing too much or too little, wasting time and resources, or missing important defects.
• Not testing all scenarios: Testers often overlook some of the test cases that may be impacted by the changes made to the software.
• Not prioritizing tests: Testers often focus on executing all the test cases without considering their significance.
• Neglect Testing environment management: Not maintaining consistent and stable test environments.
• Overlook Test Case Maintenance:  Not updating test cases after changes in the application.

Strategy And Best Practices

To avoid regression testing mistakes, it is essential to have a well-planned and executed testing strategy.

1. Maintain Consistent Testing Schedules:
   • Regularly schedule regression tests to ensure timely identification of issues.
   • Consistency helps maintain stability and reliability throughout the software development cycle.
2. Use Reliable Test Management Tools:
   • Employ robust test management tools to organize, execute, and track regression test cases efficiently.
   • These tools streamline test execution, reporting, and collaboration among team members.
3. Categorize and Prioritize Tests:
   • Break down regression test suites into logical batches based on functionality or modules.
   • Prioritize critical test cases to focus on high-impact areas of the application.
4. Consider Customer and Business Risks:
   • Understand the impact of changes on end-users and business processes.
   • Prioritize regression tests based on potential risks to customer satisfaction and revenue.
5. Automate Where Possible:
   • Leverage test automation to speed up regression testing.
   • Automated scripts can execute repetitive test cases consistently and quickly.
6. Integrate Regression Testing into CI/CD Pipelines:
   • Embed regression tests within your continuous integration and continuous deployment (CI/CD) workflows.
   • This ensures that tests run automatically during code deployments.
7. Select Appropriate Test Cases for Regression:
   • Choose test cases that cover critical functionality, boundary conditions, and common user scenarios.
   • Avoid unnecessary redundancy by excluding irrelevant test cases.
8. Enable Cross-Functional Collaboration:
   • Involve developers, testers, and business analysts in regression testing.
   • Collaborative efforts lead to better test coverage and faster issue resolution.

Conclusion

Remember, regression testing is an ongoing effort to maintain software quality and prevent regressions. By following best practices and adapting to project needs, you can ensure a robust and reliable application.

References

https://en.wikipedia.org/wiki/Regression_testing
https://www.lambdatest.com/blog/regression-testing-what-is-and-how-to-do-it/
https://www.elearningsolutionstesting.in/regression-testing-mistakes/