December 3, 2023
Difference between Danity, Smoke, Regression, and Retesting

In the software testing domain, sanity testing, smoke testing, regression testing, and retesting are all different types of testing activities aimed at ensuring the quality and functionality of software products. Let’s explore each type along with real-life examples to understand their differences:

Sanity Testing:

Sanity testing is a subset of regression testing and focuses on quickly checking the critical functionalities of a software application after a minor change or bug fix. The primary objective of sanity testing is to ensure that the recent changes have not introduced any major issues and that the software is still in a stable state for further testing.

Real-Life Example (Software):
Suppose a software application is undergoing development, and a bug related to the login functionality was recently fixed. After the fix, a sanity test is performed to verify that users can log in successfully and access their accounts. This test helps ensure that the login functionality is still working as expected and that the bug fix did not inadvertently introduce new issues.

Smoke Testing:

Smoke testing, also known as build verification testing, is a quick and shallow form of testing that is performed early in the software development life cycle. It aims to ensure that the most critical functionalities of the application work as expected and the software is stable enough for more comprehensive testing.

Real-Life Example (Software):
Imagine a software development team receiving a new build of an e-commerce website. Before proceeding with extensive testing, they perform a smoke test to check if basic functionalities like homepage navigation, product listing, and adding items to the cart are working. If the smoke test passes, it indicates that the core features are functioning well enough to proceed with more detailed testing.

Regression Testing:

Regression testing involves retesting the entire software application or specific areas of it after making changes to the codebase, introducing new features, or fixing bugs. The goal of regression testing is to ensure that the recent modifications have not negatively impacted existing functionalities.

Real-Life Example (Software):
Suppose a software application is being enhanced with a new feature that allows users to upload images. After implementing the feature, a thorough regression test is conducted to verify that all previously working functionalities, such as login, account settings, and data retrieval, still function correctly. This helps ensure that the new feature did not introduce any regressions or break existing functionalities.


Retesting involves retesting specific areas or test cases that previously failed to ensure that the reported issues have been fixed correctly. It focuses on verifying that the identified defects have been resolved and that the associated functionalities are now working as expected.

Real-Life Example (Software):
During testing, a tester finds a defect related to the search functionality of a web application, where the search results are not being displayed accurately. After the development team fixes the issue, the tester performs retesting on the search functionality to confirm that the search results are now displaying correctly and that the defect has been successfully resolved.

In summary, sanity testing and smoke testing are quick checks to verify software stability and core functionality, whereas regression testing and retesting are more comprehensive approaches to ensure the software’s overall quality and verify specific fixes. Each type of testing serves a different purpose and plays a vital role in delivering reliable and high-quality software products.

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