Sanity Testing vs Regression Testing: What Are Their Differences and Similarities?

In this blog post, we will explore the concepts of sanity testing and regression testing, understand their importance, and highlight their similarities and differences.

What is Sanity Testing, and Why Do We Need It?

Sanity testing, also known as smoke testing, is a preliminary level of testing performed to quickly evaluate whether a software application is stable enough for further comprehensive testing. It focuses on verifying the basic functionality of the system or specific modules after making minor changes or fixes. The primary objectives of sanity testing are to identify critical issues that could prevent further testing and ensure the application is ready for more rigorous testing.

The need for sanity testing arises due to the following reasons:

a) Quick Evaluation: Sanity testing provides a rapid assessment of the software's stability, allowing developers to identify major defects early on.

b) Time and Resource Efficiency: By performing a high-level check, sanity testing optimizes time and resources by eliminating the need for exhaustive testing if the application is deemed unstable.

c) Confidence Building: By ensuring the basic functionality of the software, sanity testing instills confidence in stakeholders, such as clients and end-users.

What is Regression Testing, and Why Is It So Important?

Regression testing is a vital testing technique performed to ensure that previously developed and tested functionalities of an application remain intact after introducing new code changes, bug fixes, or system enhancements. Its primary purpose is to prevent the introduction of new defects or the reemergence of old ones in areas unrelated to the changes made.


The importance of regression testing can be attributed to the following factors:

a) Stability Maintenance: As software evolves, new features and fixes are introduced. Regression testing helps maintain stability by uncovering unintended side effects or regressions caused by these modifications.

b) Risk Mitigation: Changes made to one part of the software can inadvertently impact other interconnected functionalities. Regression testing helps identify such risks and ensures the overall integrity of the application.

c) Compliance and Standards: Industries with stringent regulatory requirements, such as healthcare or finance, rely heavily on regression testing to meet compliance standards and ensure data security.

Sanity Testing vs. Regression Testing: Similarities and Differences

While sanity testing and regression testing serve distinct purposes, they share some similarities and differences:

  • Similarities:

a) Test Scope: Both techniques focus on ensuring the functionality of the software application.

b) Iterative Approach: Both tests are executed iteratively throughout the software development life cycle.

c) Test Execution: Both tests can be automated and performed manually.


  • Differences:

a) Purpose: Sanity testing determines if a software application is stable enough for further testing, while regression testing verifies that previously tested functionalities are not affected by new changes.

b) Test Depth: Sanity testing is a shallow test, whereas regression testing is more comprehensive and covers a broader range of functionalities.

c) Test Triggers: Sanity testing is triggered by minor changes or bug fixes, while regression testing is triggered by major system changes, enhancements, or new feature additions.


Sanity testing vs regression testing, they are two indispensable techniques in the arsenal of software testers. By understanding the differences and similarities between these testing techniques, software development teams can effectively implement them to deliver robust and high-quality applications.

And when it comes to functional testing, sanity testing and regression testing play crucial roles in ensuring the integrity and correctness of a mobile game application.

Sanity testing, in the context of mobile game functional testing, focuses on quickly evaluating the basic functionality of the game after minor changes or fixes. On the other hand, regression testing in mobile game functional testing ensures that previously tested functionalities of the game remain unaffected by new changes or enhancements. WeTest's experienced functional testing can verify that the main function points of the mobile game are intact and meet the specified requirements. And the detailed reports provided facilitate the quick identification and resolution of any issues.

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