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Regression testing is a method that re-runs functional and non-functional tests to ensure that a software application works properly after the code has been updated and optimized. Developers can detect and fix unexpected bugs caused by enhancements or extensions to the existing codebase during this testing. Retesting is the process of testing bugs after they have been resolved by developers. Still, testers must verify that the bugs have been completely fixed. They can also verify that the fix does not affect the remaining features of the application. As we mentioned, what are regression testing and retesting? This article covers popular regression testing methods, the steps involved in regression testing, when to do it, and retesting, which is performed after regression testing.
4 Popular Regression Testing Methods
1. Re-test everyone: This method applies regression testing to all existing test suites when the primary code of a software application is updated multiple times. It is important to identify and resolve all bugs. This method is time-consuming and resource-intensive. But when an application is moved to a new platform or a major bug in the OS needs to be fixed when an update is released, full regression is preferred.
2. Selection of regression tests: You can select the sections to perform regression testing in this method. The applicable sections are selected based on the scale of changes in the application. This method can limit the applicable test cases to the relevant areas, thereby reducing the resources and time consumed for testing.
3. Prioritization of test cases: In this method you can select test cases based on priority. Test cases are selected based on factors such as functionalities used, feature failure rate, and business impact. New functionalities and customer-focused features are considered as the highest priority test cases.
4. Hybrid: This method combines the above two principles: selection of regression tests and prioritization of test cases. The hybrid method is beneficial in many cases because the need to select all test cases at once is eliminated. Instead, you can run test cases based on requirements to save time and effort spent in testing applications.
Steps Involved in Regression Testing
step 1: Identify modifications and customizations in the source code.
Identifying the impact of changed components on existing required features.
step 2: Prioritize all requirements and code modifications by aligning the testing process with tools and test cases.
step 3: Select test cases to rerun based on the source code. After selecting the test cases they are classified into reusable and obsolete test cases. The reusable ones are used for regression testing. The obsolete ones cannot be used for future testing cycles.
step 4: Test case variables, such as regression test design, etc., are evaluated to determine how they affect test case execution time.
Step 5: Classify automated and manual test cases. Test code can be reused multiple times when automated. Retesting can be implemented to ensure that no new errors are generated due to reuse of code.
Step 6: Test cases are prioritized based on the following criteria:
- Important test cases that cover all the required features.
- Features that do not fall into the essential category but have a certain importance.
- Test cases dealing with technical complexities.
These priorities are set based on the usability of the product and user involvement.
Step 7: Schedule and execute test cases individually to verify whether the product performs as expected. Automated tools like ACCELQ, Selenium, and more can execute test cases quickly.
When to perform regression testing?
As we read above, Regression Testing Methods, What is regression testingand the steps involved. Let’s see in what situations you can perform this test.
- An existing feature of the application is specified as a new requirement.
- A new feature is added, or the code base is updated to fix bugs.
- The source code is optimized for good performance.
- The software configuration has been changed.
Above are the situations in which you can perform regression testing. Next, let’s read about some good practices for retesting software.
Good practices for software retesting
Retesting means testing the failed test cases after the developers have fixed the bugs. Best practices for retesting The software are:
- Document your test cases with careful details to ensure that anyone revisiting them understands the purpose.
- Limit testing efforts to the particular area where the bug has been identified.
- Don’t trust a code fix; verify it. Test rigorously to make sure the bug is actually resolved.
- Retesting can check for unexpected side effects on other software sections and execute the relevant test suites for complete testing.
- Regularly communicate the progress of retesting to your development team and stakeholders.
- Maintain consistency in the environment being tested. Repeat the conditions where the bug was detected to ensure accuracy.
- After the identified bugs are resolved, perform final validation to ensure that the delivered product complies with your users’ expectations.
conclusion
After updating the code for the login button, the user may not be able to log out of the software. A small change can lead to a negative user experience. Therefore, regression testing is an important action, even time-consuming.
ACCELQ is an AI-powered test automation platform on the cloud with a codeless approach. It is capable of executing CI-driven regression suites, performing API testing with regression maturity, and much more.
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