Regression testing is a crucial software testing process aimed at verifying that previously developed and tested software continues to perform as expected after changes are made. It should be conducted whenever new features are added, existing functionalities are modified, or new integrations are performed. The document outlines the phases of regression testing, including need identification, test case definition, and the use of manual or automated testing methods, emphasizing the importance of careful planning and execution.

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What is
Regression
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When Should
Regression Testing
Be Taken Up?
What are the 3 Critical Times to
Perform Software Regression Testing?
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According to Wikipedia, Regression testing is an important type of software testing that
revolves around re-running functional and non-functional tests. These tests are conducted
to ensure and check the previously developed and tested software still performs well even
after a change is made in the software. Primarily, it checks whether the previous
functionality of an application is working as intended even with a new feature added. It
checks for any new bug or error in the existing software and is a verification process that
takes place in the software.
Whenever a new feature is developed, or when an existing feature is improved or if there are any UI
updates made, eventually there is a need to perform software regression testing. Functional and
regression testing should be performed to ensure that the changes do not impact the already existing
functionality of the software.
In addition, the regression testing process should be employed whether there is a small localized change
to the software or for even a larger change that might affect any change to the old functionality. Functional
regression testing teams must verify that the new code does not conflict with older code, and also
confirms that the code that has not been changed is still working as expected. Therefore, this type of
visual regression testing ensures that the previous functionality of the application works effectively and
new changes have not introduced any sort of new bugs within the application.
A change is the key concept of regression testing process to take off and it should be taken up when:
New functionality is taken up
It is one of the important stages to initiate the regression testing process. Whenever the developers
introduce new code, they don’t fully concentrate on its compatibility with the existing code and hence the
software regression testing should be taken up to find any possible issues within software.
Existing functionality changes
Within the software development process, in some cases, developers revise the existing functionality and
exclude or edit some features based on the requirements. In such cases, functionality and regression
testing process checks whether the new changes or features do not cause any damage to the rest of the
functionality.
New Integrations take place with other products
At times of integration, regression testing assures that the software product performs flawlessly even
after integration with another product.
Define & Identify Needs and Components of Initial Phase
This is the first and important step to start with the software regression testing process wherein the
moment a single change takes place within the software, regression tests should ideally be initiated. The
main motive is to test the existing code or functionality with the help of regression test scripts. Therefore,
careful planning should be taken up to identify the needs and components of regression testing.
Define Testing Requirements
This is the second phase wherein defining of the right test cases for a project should be taken up. This
phase is achieved with an effective collaborative approach established between stakeholders, developers,
and software test engineers. Therefore, a common consensus is required to decide upon the test cases
that need to be prepared which could be reused each time there is a change in the application.
Define Entry & Exit Criteria
There is an effective need to define the entry and exit points of regression testing such that the test
objectives are in sync with the project requirements. Before beginning the software regression testing,
the entry and exit criteria should be identified to smoothen the process of regression testing.
Regression testing can be achieved by adopting either manual regression testing or automated regression
testing.
What is Manual Regression testing?
When regression testing is performed by manual testers, then test cases are initially drafted and they will
be executed. These tests help to check whether it is a pass or fail based on the expected results
mentioned in the test cases. No separate tools are used to perform this testing process.
What is Automated Regression Testing?
When it comes to automated regression testing, various types of test automation tools are used to
perform the regression testing process. It is evident that manual regression testing takes a lot of time and
to save time, automated regression testing is taken up. Typically, automated regression testing includes
various steps such as deciding on what test cases to automate, whether to test early or test often, along
with some importance placed around test automation tool to be selected.
Leverage a next-gen software regression testing services provider to ensure quality software that
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Define & Identify Needs and
Components of Initial Phase
Define Testing Requirements
Define Entry & Exit Criteria
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