Regression Testing vs Integration Testing | Key Differences & Importance

This article talks about regression testing vs integration testing and their basic definitions. Read till the end to learn these basic testing concepts.


Those who work in software testing frequently use the words "regression testing" and "integration testing" very loosely. Both of these types of testing are now used interchangeably with the word "checking," with the assumption that all they refer to is determining if the program has operated as planned or not. This blog post aims to clear up this misunderstanding by describing the differences and similarities between the two types of testing regression testing vs integration testing showoff.

What is Regression Testing?

Regression testing is a type of software testing that focuses on ensuring that modifications or updates made to a software application did not result in the introduction of new flaws or the breakdown of already-existing functionality. To make sure that the existing functionalities are still operating as intended after revisions, it includes rerunning previously executed test cases.

When software changes, such as bug patches, improvements, or new feature additions, there is a chance that new problems could be mistakenly introduced or that existing functionalities will be broken. Regression testing attempts to prevent regression, which occurs when a previously functional software feature stops operating or acts differently as a result of recent modifications, by identifying these problems early in the development cycle.

What is Integration Testing?

Integration testing is a type of software testing that focuses on examining how various software system modules or components interact with one another. To make sure the combined components function as expected, it is done after unit testing and before system testing.

Individual modules or components are frequently created and tested independently when developing software. To confirm that these components work effectively and share data when joined, integration testing is carried out. Finding any flaws or problems that result from the integration of several modules is the main objective.

Regression Testing vs Integration Testing:

1. Purpose:

The major goal of regression testing is to make sure that changes or updates to a software program don't result in the introduction of brand-new flaws or the breakdown of already-existing functionality. It focuses on rerunning previously completed test cases to confirm the stability and accuracy of the system following modifications. Integration testing tries to verify the cooperation and communication between various software system modules or components. It makes the integrated parts function as a unit and communicates data properly.

2. Timing:

Regression testing usually takes place after the software has changed, such as bug patches, improvements, or the inclusion of new features. Regression testing guarantees that the modifications have no detrimental effects on the functionality already in place.

After unit testing and before system testing comes integration testing which verifies the integration of modules or components to make sure their proper operation as a whole.

3. Automation:

To efficiently run a lot of test cases, automation is frequently utilized in regression testing. Every time the product is changed, automated regression test suites can be run to quickly identify potential regressions.

Automation can be utilized in integration testing, however, manual testing is frequently preferred because of the complexity of analyzing interactions between components and the requirement for validation at various levels.

4. Approach:

Regression testing involves running previously completed test cases that cover the compromised program components again. The emphasis is on ensuring that there are no regression problems and that the system operates as planned. Testing the integration points and interactions between the parts is known as integration testing. Different integration strategies, including big bang, top-down, bottom-up, and hybrid, are employed to verify the effectiveness of component collaboration.

5. Scope:

Regression concentrates on retesting the software's modified sections and confirming the parts of the program that remain unaltered. The goal is to make sure that changed features don't interfere with or damage current ones. Integration testing is concerned with examining how various parts or modules interact with one another. To guarantee the proper operation and cooperation of the components, it seeks to detect any problems or flaws that develop as a result of the integration process.

Wrapping Up: 

When it comes to summarizing the comparison of regression testing vs integration testing, it can be stated that Regression testing, in short, focuses on ensuring that existing functionalities are not impacted while confirming the stability of the product following changes. On the other hand, integration testing verifies the cooperation and interaction between components or modules to make sure they function properly together. Both strategies are essential for assuring the dependability and quality of software.

WeTest offers the industry's leading standard testing services where one gets standard regression and integration tests along with a suite of software designed to deliver reliable results. Clients can expect quality mobile platform performance tests & Analysis tools like Perfdog and many more to give a piece of mind when it comes to SLDC and testing routines. 

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