Software testing plays a crucial role in the software development life cycle by verifying that the end product is devoid of flaws and satisfies all predetermined requirements. Retesting and regression testing are widely recognized as significant methodologies in the field of software testing. Nonetheless these phrases seem to be synonymous, they serve unique functions and are carried out at various phases of the testing process. The article will explore the difference between retesting and regression testing, with the aim of elucidating their importance in guaranteeing the quality of software.

Definition:

Retesting:

Retesting is a software testing approach that aims to validate the successful resolution of identified defects from a prior testing iteration. When a defect or issue is reported by the quality assurance team, software developers undertake efforts to address and resolve the identified problem. Following the resolution of the code, a retesting process is undertaken to verify the successful rectification of the identified defect. This retesting aims to confirm that the affected functionality now operates in accordance with the expected behavior.

Regression Testing:

Regression testing is a software testing procedure used to make sure that new code additions, bug patches, or feature additions do not negatively affect the application’s current functioning. When developers introduce changes to the software, there is a possibility of unintentionally breaking previously functioning areas. Regression testing aims to catch such regressions and ensures the overall system stability.

Scope:

Retesting:

The scope of retesting is limited to the specific defects or issues that were identified in the previous testing cycle. Testers focus only on the functionalities that were affected and the associated areas, ensuring that the particular problems have been resolved.

Regression Testing:

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In contrast, regression testing has a broader scope. It involves running a comprehensive suite of test cases to cover not only the changes made but also other critical areas of the application that might have been affected due to the recent modifications. The idea is to catch unintended side effects in other parts of the system.

Test Cases Selection:

Retesting:

For retesting, test cases are selected based on the specific defects that were identified and fixed. The focus is on creating test scenarios that can validate the resolution of those particular issues.

Regression Testing:

Regression testing requires a more comprehensive approach to test case selection. Testers typically use a regression test suite, which consists of a vast collection of test cases covering different functionalities of the software. This suite ensures that both the modified areas and other critical parts of the application are thoroughly tested to prevent regression issues.

Conclusion

To sum up, although both retesting and regression testing are important aspects of software testing, they are used for distinct reasons and at distinct points in the process. Software development teams may reduce the likelihood of bugs and functionality regressions by doing both forms of testing in a planned and methodical manner before releasing their products to customers.

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