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Difference Between Regression Testing and Integration Testing

 

What is regression testing?

It is a testing method that is performed to ensure that despite making any changes, modifications and updations to the code, the existing functionalities of the software application are working as expected. The overall functionality and stability of the existing features are tested using this testing method. Test cases that have been already executed are partially or fully selected and then re-executed in order to make sure that the existing functionalities are working as expected.

What is integration testing?

It is a testing method where different software modules are validated based on how they function when they are combined, especially in terms of performance and effectiveness. The focus is on finding defects when these software modules that have been coded by different programmers interact with each other. How the data is being communicated amongst these modules is thoroughly checked.                

Difference between regression testing and integration testing:

Regression testing


Integration testing

If there is any modification, alteration or updation in the code structure of the software, then regression testing is performed


After unit testing is being successfully completed, then the process of integration testing is initiated and performed

This testing method is performed to check if there are any old bugs that have been reintroduced after any code alterations, updations or modifications

How effectively the units are functioning between each other is checked using this testing method

This testing method can be performed at every phase of the development process, before or after the initial deployment, depending on when the changes are being made


Before the application’s initial deployment, this testing method is performed

After the integration testing is done, unit tests are run again. This is where regression testing is performed to make sure that any further changes have not broken any units that have been already tested. Unit tests are run again and again for regression testing  


Many units are integrated together and then tested. Focus is on ensuring that the code works when put together including libraries, databases and dependencies  


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