Top 50 Regression Testing Interview Questions and Answers 2025

Smoke testing is a quick and shallow test to ensure the basic functionality of an application. Regression testing is a comprehensive test to ensure that changes made to the application do not affect its existing functionality.

• Smoke testing is performed after a new build is received and before regression testing.

• Smoke testing is a subset of regression testing.

• Regression testing is performed after changes are made to the application.

• Regression testing ensures that the existing ...read more

Regression testing ensures that changes to the code do not affect existing functionality. Sanity testing checks if the critical functionalities are working after a small change.

• Regression testing is done after making changes to the code to ensure that existing functionalities are not affected.

• Sanity testing is done after a small change to ensure that critical functionalities are still working.

• Regression testing is done after every major change, while sanity testing is done af...read more

Retesting is the process of re-executing test cases that failed in the previous test cycle, while regression testing is the process of re-executing test cases to ensure that changes or fixes have not introduced new defects.

• Retesting focuses on the failed test cases from the previous test cycle.

• Regression testing focuses on ensuring that changes or fixes have not introduced new defects.

• Retesting is performed to validate that the reported defects have been fixed.

• Regression test...read more

Re-testing is necessary to ensure that the fixes made during regression testing have resolved the identified defects.

• Re-testing helps validate that the defects identified during regression testing have been fixed.

• Regression testing focuses on ensuring that existing functionality is not affected by new changes.

• Re-testing focuses on verifying that the specific defects have been resolved.

• Regression testing may not cover all the scenarios or combinations that caused the defects i...read more

Regression testing is to ensure that changes made to the software do not affect the existing functionality. Functional testing is to ensure that the software meets the specified requirements.

• Regression testing is done after changes are made to the software to ensure that the existing functionality is not affected.

• Functional testing is done to ensure that the software meets the specified requirements.

• Regression testing is usually automated and focuses on testing the entire sys...read more

Adhoc testing is informal and unplanned, while regression testing ensures that previous functionality is not affected.

• Adhoc testing is performed without any specific test cases or plan.

• It is usually done randomly or based on the tester's intuition.

• Regression testing is performed to ensure that changes or additions to the software do not impact existing functionality.

• It involves retesting the previously tested functionalities to ensure they still work as expected.

• Adhoc testing...read more

SDLC is a process followed for software development. Regression testing is a type of testing done to ensure that changes made to the software do not affect the existing functionality.

• SDLC stands for Software Development Life Cycle

• It consists of phases like planning, analysis, design, implementation, testing, and maintenance

• Regression testing is done to ensure that changes made to the software do not affect the existing functionality

• It involves re-executing the test cases that...read more

Regression report can be generated using tools like JMeter, Selenium, or custom scripts.

• Identify the test cases to be included in the report

• Execute the test cases and collect the results

• Analyze the results and identify the regression issues

• Generate a report with details on the regression issues and their severity

• Include graphs and charts to visualize the data

• Automate the report generation process for future use

Retest testing is done to verify if a failed test case has been fixed, while regression testing is done to ensure that changes made to the software do not affect existing functionality.

• Retest testing is done after a failed test case has been fixed to ensure that it now passes.

• Regression testing is done to ensure that changes made to the software do not affect existing functionality.

• Retest testing is a subset of regression testing.

• Regression testing is done after every change ...read more

Regression testing is retesting of previously tested functionality, while confirmation testing is testing to ensure a defect fix.

• Regression testing is performed to ensure that changes or fixes in the software do not introduce new defects or impact existing functionality.

• Confirmation testing is performed to verify that a reported defect has been fixed and no longer exists in the software.

• Regression testing focuses on the broader scope of the system, while confirmation testing ...read more

Manual testing is the process of manually testing software for defects, while regression testing is retesting the software to ensure new changes haven't affected existing functionality.

• Manual testing involves executing test cases manually without the use of automation tools.

• It is done to find defects in the software and ensure it meets the specified requirements.

• Regression testing is the process of retesting the software after changes to ensure that existing functionalities a...read more

Regression testing is retesting of software to ensure that recent changes have not adversely affected existing features. Regression defects are bugs that reappear after changes.

• Regression testing is performed to make sure that new code changes have not introduced any new bugs or caused existing functionalities to break.

• It involves re-executing test cases that cover the impacted areas of the software.

• Regression defects are bugs that were previously fixed but resurface after ne...read more

Regression testing is retesting of software to ensure new code changes do not adversely affect existing functionality. Performance testing is testing to assess the speed, responsiveness, and stability of a system under a particular workload.

• Regression testing ensures that new code changes do not introduce new bugs or issues in existing functionality.

• Performance testing evaluates the speed, responsiveness, and stability of a system under specific workloads.

• Regression testing i...read more

Regression testing focuses on retesting modified code to ensure no new bugs are introduced, while system testing evaluates the entire system's functionality.

• Regression testing is performed on modified code to ensure that new changes do not introduce new bugs.

• System testing evaluates the entire system's functionality to ensure it meets the specified requirements.

• Regression testing is typically automated to save time and effort.

• System testing is usually performed manually to si...read more

STLC stands for Software Testing Life Cycle, which is a process used to test software products. Regression testing is retesting of software after changes to ensure no new bugs are introduced.

• STLC is a series of steps followed to ensure high-quality software testing, including planning, designing, executing, and reporting.

• Regression testing is the process of retesting software to confirm that recent changes have not adversely affected previously tested functionality.

• Regression...read more

Regression testing ensures that new code changes do not adversely affect existing functionality, while integration testing checks if different modules work together correctly.

• Regression testing focuses on retesting existing functionality after code changes

• Integration testing checks if different modules work together as expected

• Regression testing is usually automated to save time and effort

• Integration testing may involve manual testing to ensure all components work together se...read more

Retest testing is done to verify that a specific bug or issue has been fixed, while regression testing is done to ensure that new code changes have not affected existing functionality.

• Retest testing is focused on verifying that a specific bug or issue has been fixed

• Regression testing is focused on ensuring that new code changes have not affected existing functionality

• Retest testing is typically done after a bug fix, while regression testing is done after new code changes

• Both ...read more

UAT testing is user acceptance testing, while regression testing is a type of testing to ensure changes don't break existing functionality.

• UAT testing involves testing the system by end-users to ensure it meets their requirements and expectations.

• Regression testing involves testing the system after changes have been made to ensure existing functionality has not been affected.

• UAT testing is typically done towards the end of the development cycle, while regression testing is do...read more

Regression testing focuses on retesting specific areas of code, while end-to-end testing involves testing the entire system from start to finish.

• Regression testing is focused on retesting specific areas of code that have been changed or updated.

• End-to-end testing involves testing the entire system from start to finish to ensure all components work together correctly.

• Regression testing is typically done after code changes to ensure that new updates do not break existing functi...read more

Regression testing is the process of testing changes made to an application to ensure that existing functionalities still work as expected.

• Regression testing is performed after making changes to an application to ensure that the existing functionalities are not affected.

• It is a type of testing that ensures that the application still works as expected after changes have been made.

• Regression testing can be automated or manual.

• It is different from regular testing as it focuses o...read more

Regression testing is the process of retesting a software application to ensure that new code changes have not adversely affected existing functionality.

• Regression testing is performed to make sure that new code changes do not introduce new bugs or issues.

• It involves re-executing test cases that have been previously executed to verify that existing functionality still works as expected.

• Test cases for regression testing should cover both the affected areas of the application a...read more

Retesting is testing the same functionality again to ensure the defect is fixed, while regression testing is testing the entire application to ensure new changes do not impact existing functionality.

• Retesting focuses on confirming a specific defect fix, while regression testing focuses on ensuring no new defects are introduced.

• Retesting is usually done by the tester who found the defect, while regression testing can be done by any tester.

• Retesting is a subset of regression te...read more

Regression testing ensures new code changes do not adversely affect existing functionality. Smoke testing verifies basic functionality.

• Regression testing involves retesting existing functionality to ensure new code changes have not introduced bugs or issues

• Smoke testing is a preliminary test to check if the basic functionalities of the software are working fine

• Regression testing is usually automated to save time and effort

• Smoke testing is often done manually and is a quick ch...read more

Regression testing is done to ensure that changes made to the software do not affect the existing functionality. Sanity testing is done to ensure that the critical functionalities of the software are working fine after a small change.

• Regression testing is done after major changes in the software

• Sanity testing is done after minor changes in the software

• Regression testing is time-consuming and requires a lot of resources

• Sanity testing is quick and requires fewer resources

• Regres...read more

Regression testing is done to ensure that changes made to the software do not affect the existing functionality. Retesting is done to ensure that defects found in earlier testing have been fixed.

• Regression testing is done after changes are made to the software to ensure that existing functionality is not affected

• Retesting is done after defects are fixed to ensure that they have been resolved

• Regression testing is done on the entire system while retesting is done only on the sp...read more

Retesting is testing the same functionality again after fixing defects while regression testing is testing the unchanged functionality to ensure it still works after changes.

• Retesting is done to ensure that the defects found in the previous test cycle have been fixed

• Regression testing is done to ensure that the unchanged functionality still works after changes have been made

• Retesting is done after fixing defects while regression testing is done after any changes have been mad...read more

Re-testing is testing the same functionality again to ensure the defect has been fixed, while regression testing is testing the unchanged parts of the software to ensure no new defects have been introduced.

• Re-testing focuses on the specific defect that was fixed, while regression testing focuses on ensuring that the rest of the software still works as expected.

• Re-testing is done after a defect is fixed, while regression testing is done after new code changes are made.

• Re-testi...read more

Functional testing checks if software meets requirements, regression testing ensures changes don't break existing functionality.

• Functional testing verifies if software meets functional requirements

• Regression testing ensures that changes to software don't break existing functionality

• Functional testing is done before regression testing

• Regression testing is done after changes are made to software

• Both types of testing are important for ensuring software quality

Clients opt for automation testing to save time and cost. My role in regression testing is to ensure that the software still works after changes.

• Automation testing saves time and cost by reducing manual effort

• Regression testing ensures that the software still works after changes

• My role in regression testing is to create and execute automated test cases

• I also analyze test results and report defects to the development team

Integration testing focuses on testing the interaction between different components, while regression testing ensures that previously working functionality is not affected by new changes.

• Integration testing verifies the correct functioning of integrated components or systems.

• Regression testing checks if new changes have introduced any defects or caused any previously working functionality to fail.

• Integration testing is performed after unit testing and before system testing.

• Re...read more

Regression testing is retesting of previously tested functionality to ensure that changes or fixes have not introduced new defects. Smoke testing is a subset of regression testing that focuses on testing the critical functionalities of an application.

• Regression testing is performed to verify that changes or fixes in software have not introduced new defects or caused existing functionalities to fail.

• It involves retesting of previously tested functionalities to ensure their con...read more

Sanity testing is a quick check to ensure the basic functionality of the application, while regression testing is a comprehensive check to ensure that new changes do not affect existing functionality.

• Sanity testing is performed on a new build or a small change in the code

• Regression testing is performed on a modified build to ensure that existing functionality is not impacted

• Sanity testing is a subset of regression testing

• Sanity testing is a quick and shallow test, while regre...read more

Regression testing is the process of testing changes made to an application to ensure that existing functionality still works.

• It is performed after making changes to the software to ensure that the existing functionality is not affected.

• It helps to identify any new defects or issues that may have been introduced due to the changes made.

• It is usually automated to save time and effort.

• It is an important part of the software testing process.

• Example: After adding a new feature to...read more

Regression testing is testing the entire application after a change, while re-testing is testing a specific part after a bug fix.

• Regression testing involves testing the entire application to ensure that new changes have not affected existing functionality.

• Re-testing involves testing a specific part of the application that was previously found to have a bug, after the bug has been fixed.

• Regression testing is done to ensure that new changes do not introduce new bugs, while re-t...read more

Regression testing is testing the entire application after a change, while re-testing is testing a specific bug fix.

• Regression testing is done to ensure that new code changes do not adversely affect existing functionality.

• Re-testing is done to verify that a specific bug or issue has been fixed.

• Regression testing involves running a full suite of tests, while re-testing focuses on the specific test cases related to the fixed bug.

• Example: After adding a new feature to a software...read more

Functional testing checks if the software meets requirements. Regression testing ensures changes don't break existing functionality.

• Functional testing verifies if the software meets functional requirements

• Regression testing ensures that changes to the software do not break existing functionality

• Functional testing is done before regression testing

• Regression testing is done after changes are made to the software

• Functional testing is done manually or with automation tools

• Regress...read more

Smoke testing is a quick test to check if the software build is stable, while regression testing is a thorough test to ensure new changes haven't affected existing functionality.

• Smoke testing is done to check if the critical functionalities of the software are working fine after a new build or release.

• Regression testing is done to ensure that new changes or fixes haven't introduced any new bugs or affected existing functionalities.

• Smoke testing is a subset of regression testi...read more

It depends on the severity and impact of the issue and the scope of the fix.

• If the issue was critical and had a wide impact, a full regression test may be necessary.

• If the issue was minor and the fix was isolated, a sanity test may suffice.

• The decision should be based on risk assessment and the scope of the changes made.

• Both regression and sanity tests have their own importance and should be used appropriately.

Regression testing is testing the entire system after making changes, while retesting is testing a specific bug fix.

• Regression testing ensures that changes made to the system do not affect existing functionality.

• Retesting ensures that a specific bug or issue has been resolved.

• Regression testing is done after every change, while retesting is done after a bug fix.

• Regression testing is time-consuming, while retesting is relatively quick.

• Example of regression testing: testing the...read more

Regression testing ensures existing functionality still works after changes, while sanity testing checks if new functionality works as expected.

• Regression testing is performed to make sure that new code changes do not adversely affect existing functionality.

• Sanity testing is a cursory testing to make sure that the new functionality is working as expected.

• Regression testing is usually automated and covers a wide range of test cases.

• Sanity testing is usually done manually and f...read more

Regression testing is testing the entire application after changes, while re-testing is testing specific areas that were previously found to have issues.

• Regression testing involves testing the entire application to ensure that new changes have not affected existing functionality.

• Re-testing focuses on testing specific areas that were previously found to have issues to ensure they have been fixed.

• Regression testing is typically done after every code change, while re-testing is ...read more

Functional testing verifies that the software meets the specified requirements, while regression testing ensures that the existing functionality is not affected by new changes.

• Functional testing focuses on testing the individual functions or features of the software.

• Regression testing is performed to ensure that the existing functionality is not broken after making changes or adding new features.

• Functional testing is usually performed before regression testing.

• Functional test...read more

Regression testing ensures existing functionality still works after changes. Sanity testing checks critical functionality.

• Regression testing is done after changes to ensure existing functionality still works

• Sanity testing is done to check critical functionality after minor changes

• Regression testing is comprehensive while sanity testing is narrow in scope

• Example of regression testing: testing all existing features after a software update

• Example of sanity testing: testing login...read more

Retesting is testing the same functionality again after fixing the defects. Regression testing is testing the entire system after making changes.

• Retesting is done to ensure that the defects have been fixed and the functionality is working as expected.

• Regression testing is done to ensure that the changes made to the system have not affected the existing functionality.

• Retesting is a subset of regression testing.

• Regression testing is time-consuming and requires a comprehensive t...read more

Functional Testing focuses on testing the functionality of the software, while Regression Testing ensures that new changes do not affect existing functionality.

• Functional Testing verifies that the software functions as expected based on the requirements.

• Regression Testing ensures that new code changes do not negatively impact existing functionality.

• Functional Testing is typically done before Regression Testing in the software development lifecycle.

• Examples of Functional Testi...read more

Sanity and regression testing are types of software testing used to ensure the stability and functionality of a product.

• Sanity testing is a narrow and focused testing approach to quickly determine if the software is ready for further testing.

• Regression testing is the process of retesting the unchanged parts of the software after modifications to ensure that no new bugs have been introduced.

• Sanity testing is usually performed before regression testing to check critical functio...read more

Retesting is testing the same functionality again after a defect is fixed, while regression testing is testing the entire application to ensure new changes do not impact existing functionality.

• Retesting focuses on verifying that a specific defect has been fixed.

• Regression testing focuses on ensuring that new changes do not introduce new defects or impact existing functionality.

• Retesting is usually performed by the tester who found the defect.

• Regression testing is typically pe...read more

Regression testing ensures existing functionality still works after changes, while sanity testing checks for basic functionality.

• Regression testing is done to make sure that new code changes do not adversely affect existing functionality

• Sanity testing is a cursory testing to make sure that the new functionality is working as expected

• Regression testing is comprehensive and time-consuming, while sanity testing is quick and focused

• Regression testing is usually automated, while s...read more

Regression testing is testing the entire application after changes, while retesting is testing a specific bug fix.

• Regression testing ensures that new code changes do not affect existing functionality

• Retesting focuses on verifying that a specific bug fix has been successfully implemented

• Regression testing is done after every code change, retesting is done after a bug fix

• Regression testing involves running a full suite of tests, retesting focuses on the specific test case relat...read more

Sanity testing is a subset of regression testing that focuses on testing the core functionalities of an application.

• Sanity testing is performed to ensure that the critical functionalities of an application are working as expected.

• It is a quick and shallow form of testing that is usually performed after a new build or a minor change.

• Sanity testing helps in identifying major issues early in the development cycle.

• Regression testing, on the other hand, is performed to ensure that...read more

Regression testing checks if changes in code affect existing functionality. Retesting checks if defects have been fixed.

• Regression testing ensures that new changes do not affect existing functionality

• Retesting ensures that defects have been fixed and do not reoccur

• Regression testing is performed after every change in code

• Retesting is performed after a defect has been fixed

• Both are important to ensure the quality of the software

• Example: If a defect was found in the login funct...read more

Sanity testing is a narrow and focused testing to check if the software is stable for further testing, while regression testing is re-testing the software after changes to ensure existing functionalities are not affected.

• Sanity testing is a subset of regression testing.

• Sanity testing is done to quickly check if the software is stable for further testing.

• Regression testing is done to ensure that new changes have not affected existing functionalities.

• Sanity testing is usually p...read more

Regression testing is retesting of software to ensure that new code changes have not adversely affected existing functionality.

• Regression testing involves running previously executed test cases to verify that new code changes have not introduced any new bugs or issues.

• Retesting is the process of running failed test cases again after the bugs have been fixed to ensure they have been resolved.

• Regression testing is typically automated to save time and effort in retesting.

• It is i...read more

Regression testing is to ensure that changes made to the software do not affect existing functionality. Sanity testing is to ensure that the software is stable enough for further testing.

• Regression testing is done after changes are made to the software to ensure that existing functionality is not affected.

• Sanity testing is done to ensure that the software is stable enough for further testing.

• Regression testing is a type of functional testing while sanity testing is a type of ...read more

Regression testing is testing the entire application after changes, while retesting is testing a specific bug fix.

• Regression testing involves testing the entire application to ensure that new code changes have not negatively impacted existing functionality.

• Retesting involves testing a specific bug fix to ensure that the issue has been resolved.

• Regression testing is typically done after every code change, while retesting is done after a bug fix.

• Regression testing helps ensure ...read more

Sanity testing is a narrow and focused testing to check if the basic functionalities are working fine after changes, while regression testing is a comprehensive testing to ensure that new code changes do not affect existing functionalities.

• Sanity testing is a quick and narrow test to ensure that the basic functionalities of the application are working as expected after minor changes.

• Regression testing is a comprehensive test that is performed to ensure that new code changes d...read more

Regression testing is testing the entire application after a change, while retesting is testing a specific bug fix.

• Regression testing involves testing the entire application to ensure that new changes have not affected existing functionality.

• Retesting involves testing a specific bug fix to ensure that the issue has been resolved.

• Regression testing is typically done after every code change, while retesting is done after a bug fix.

• Example: After adding a new feature, regression...read more

Regression sanity testing is a subset of regression testing focused on testing critical functionalities to ensure stability.

• Regression sanity testing is a quick and focused testing of critical functionalities to ensure stability after code changes.

• It is usually performed after a new build or code changes to ensure that the core functionalities are working as expected.

• It helps in identifying any major issues quickly without going through the entire regression test suite.

• Regres...read more

Regression testing is done to ensure that new code changes have not adversely affected existing functionality, while retesting is done to verify that a specific bug has been fixed.

• Regression testing is performed after code changes to ensure that existing functionality still works as expected.

• Retesting is performed to verify that a specific bug has been fixed.

• Regression testing is broader in scope and covers multiple functionalities, while retesting is focused on a specific is...read more

Sanity testing is a quick test to check if the software is stable, while regression testing is a thorough test to ensure new changes haven't affected existing functionality.

• Sanity testing is a subset of regression testing

• Sanity testing is usually performed on build with minor changes

• Regression testing is performed on every build to ensure existing functionality is not impacted by new changes

Retesting is testing the same functionality again to ensure the defect has been fixed, while regression testing is testing the entire application to ensure new changes have not affected existing functionality.

• Retesting focuses on verifying that a specific defect has been fixed.

• Regression testing focuses on ensuring that new changes have not affected existing functionality.

• Retesting is usually done by the QA analyst who reported the defect.

• Regression testing is usually done by...read more

Regression testing is retesting of previously tested functionality, while sanity testing is a quick check to ensure basic functionality is working.

• Regression testing is performed to ensure that changes or fixes in the software do not introduce new defects or impact existing functionality.

• It involves retesting of the entire application or a specific set of test cases.

• Regression testing is usually performed after major changes or enhancements to the software.

• Sanity testing is a...read more

Regression testing is testing the entire application after a change, while retesting is testing a specific bug fix.

• Regression testing is done to ensure that new code changes do not adversely affect existing functionality.

• Retesting is done to verify that a specific bug or issue has been fixed.

• Regression testing includes testing all the previously tested features to ensure they still work correctly.

• Retesting focuses on the specific bug or issue that was fixed.

• Examples of regres...read more