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What is Re-testing?

Re-testing is a type of testing performed to check the test cases that were unsuccessful in the final execution are successfully pass after the defects are repaired

What is Regression Testing?

Regression testing is a type of software testing executed to check whether a code change has not unfavorably disturbed current features & functions of an Application

Re-testing Vs Regression Testing is a common FAQ amongst QA aspirants.

Below is a detailed comparison.

Difference between Retesting and Regression Testing

Regression Testing
Re-testing
  • Regression testing is carried out to confirm whether a recent program or code change has not adversely affected existing features
  • Re-testing is carried out to confirm the test cases that failed in the final execution are passing after the defects are fixed
  • The purpose of regression testing is that new code changes should not have any side effects to existing functionalities
  • Re-testing is done on the basis of the defect fixes
  • Defect verification is not the part of regression testing
  • Defect verification is the part of re-testing
  • Based on the project and availability of resources, regression testing can be carried out parallel with Re-testing
  • Priority of re-testing is higher than regression testing, so it is carried out before regression testing
  • You can do automation for regression testing, manual testing could be expensive and time consuming
  • You cannot automate the test cases for Retesting
  • Regression testing is known as a generic testing
  • Re-testing is a planned testing
  • Regression testing is done for passed test cases
  • Retesting is done only for failed test cases
  • Regression testing checks for un-expected side-effects
  • Re-testing makes sure that the original fault has been corrected
  • Regression testing is only done when there is any modification or changes become mandatory in existing project
  • Re-testing executes a defect with same data and the same environment with different inputs with new build
  • Test cases for regression testing can be obtained from the functional specification, user tutorials and manuals, and defect reports in regards to corrected problems
  • Test cases for retesting cannot be obtained before start testing.