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Regression In Testing

Regression Testing To Ensure Quality Assurance

Regression Testing is a way to ensure that your software remains bug-free. It’s used to find bugs in your code, which are then fixed before the end of development. It has become a standard practice in many companies, but it’s important to know how regression works and why it’s so important for quality assurance (QA) teams. In this article, we will discuss what exactly regression means and how you can use it for your own projects. It is an essential component of the software testing process that ensures the quality and stability of software applications throughout their lifecycle. It involves retesting previously tested functionalities to identify any defects or issues that may have arisen due to recent changes or additions to the software.

What is regression?

Regression, in the context of software development and testing, refers to the phenomenon where changes or modifications made to a software application inadvertently introduce defects or disrupt existing functionality. It is the tendency of a system to return to a previous state of exhibiting undesired behavior after modifications have been applied. Regression can occur due to various factors, such as code changes, bug fixes, software updates, or the integration of new features. Regression can manifest as the reoccurrence of previously resolved issues or the introduction of new defects in areas that were functioning correctly before the changes were implemented. It is a common challenge in software development, as even minor alterations in one part of the system can have unintended consequences in other interconnected components.

To mitigate the risks associated with regression, is performed. That involves retesting previously tested functionalities to ensure that they still function as intended after changes have been made. This testing technique helps identify and address any regression defects, ensuring the stability and quality of the software application throughout its lifecycle. Regression In Testing plays a crucial role in software development and quality assurance, helping to maintain the overall integrity and reliability of the software. By detecting and resolving regression issues early in the development process, organizations can deliver stable and high-quality software products to end-users.

How to identify

When it comes to Regression In Testing, there are several things that need to be considered. First, you need to determine the problem. The best way is by conducting a walkthrough with your team members and observing how they perform their tasks in real-life situations.
Next, you should identify the cause of this issue so that you can eliminate it from further testing stages or reduce its impact on other parts of your application (e.g., data entry). For example: “We identified an issue where users were unable to complete some tasks because they received an error message when trying them out.” Once we know what’s causing this problem, we can fix it by modifying one part of our application or adding another step so that users don’t get stuck anymore during these activities


It is a critical aspect of the software testing process. It involves retesting previously tested functionalities to ensure that they still function correctly after changes or additions have been made to the software. The primary purpose of regression testing is to identify any defects or issues that may have been inadvertently introduced due to recent modifications. By performing that, software development teams can ensure that the overall stability and quality of the application is maintained throughout its lifecycle. It helps in preventing the recurrence of previously resolved issues and ensures that new changes do not negatively impact the existing functionality. By incorporating that into the software development process, organizations can mitigate the risks associated with regression and deliver robust and reliable software products to their users.

It is a crucial part of software testing. It involves retesting previously tested functionalities to ensure they still work correctly after changes have been made. The goal is to catch any unintended defects that may have been introduced. By performing regression testing, developers can maintain the stability and quality of the software throughout its lifecycle. It helps prevent the recurrence of known issues and ensures that new changes do not disrupt existing functionality. Overall, regression testing plays a vital role in delivering reliable software to end-users.

How to prevent regressions in your testing

Use test coverage to identify areas where regression testing is needed.
Create a regression test suite.
Use a regression testing tool to carry out the tests, or write them yourself using some sort of scripting language (e.g., PHP).
Check for regressions after every release: If you find that there are any errors in your code, then make sure they get fixed before going on with development!

Where do you apply ?

It is a type of software testing that’s used to confirm that a new version or release of a software product does not alter the functionality of the earlier versions. This is important because it allows you to know if your application has been altered by external factors, such as bugs in code or new components being added by users.
It can be achieved after system integration and before system delivery.

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Testing with regression coverage:

Its  coverage is the part of code you have covered by unit tests. It’s a simple concept: if you have 100% coverage, then every line of code in your app has been covered by one or more unit tests. Unit tests run on every single line of code as it’s being written (or modified). This means that if something changes and breaks your functionality, there will be an error message or failure reported in the console window at runtime and not when running your test suite manually. If you want to see how much regression coverage actually matters for a given build in practice, try this little experiment: Create a new ASP.NET Core MVC Web API project with four methods containing no business logic whatsoever; call each method with some random data; then run through them one by one until all tests pass  which should take under 10 minutes.

Regression in Testing


  • Detecting Regression Defects: By retesting previously functioning areas of the software, regression testing helps identify defects that may have been introduced due to recent changes or additions. It ensures that the software maintains its expected behavior.
  • Ensuring Stability: Regression testing provides confidence that the overall stability of the software has not been compromised. It helps prevent the recurrence of previously resolved issues and ensures that new changes do not negatively impact existing functionality.
  • Saving Time and Effort: Identifying and addressing issues early in the software development process through regression testing can save time and effort in the long run. It reduces the likelihood of costly and time-consuming rework during later stages of development or after the software has been released.


  • Resource Intensive: Regression testing can be resource-intensive, requiring significant time, effort, and test infrastructure. Executing comprehensive regression test suites can pose challenges, especially when there are time constraints or limited testing resources.
  • Test Case Maintenance: As the software evolves, test cases for regression testing need to be updated or added to accommodate new features or changes. Maintaining an up-to-date regression test suite can be demanding and requires ongoing effort.


  • Improved Software Quality: By identifying and addressing potential defects and issues, regression testing ensures the overall quality and reliability of the software. It helps deliver a stable and robust product to end-users.
  • Enhanced User Experience: Regression testing helps prevent regressions in the software, ensuring a consistent and seamless user experience. It reduces the occurrence of unexpected issues and instills confidence in the software’s functionality.
  • Mitigation of Risks: By detecting and fixing issues early in the development cycle, regression testing helps mitigate risks associated with software changes. It minimizes the chances of critical failures or negative impacts on users.


Q1: What is Regression In Testing?

A: Regression In Testing is a software testing technique that verifies the unchanged parts of a software application to ensure that they still function correctly after any modifications or additions have been made.

Q2: Why is regression testing necessary?

A: It is necessary because software is constantly evolving. New features, bug fixes, and updates can inadvertently introduce new defects or impact existing functionality. That helps identify and address such issues before they affect the overall quality of the software.

Q3: When should regression testing be performed?

A: It should be performed whenever there are changes or additions to the software, such as bug fixes, enhancements, or new features. It is typically executed after each development cycle or release to ensure the stability of the application.

Q4: What are the different types of regression testing?

A: There are various types of regression testing, including unit regression testing, partial regression testing, complete regression testing, and selective regression testing. The choice of regression testing type depends on factors such as the scope of changes and available resources.


It is an integral part of quality assurance in software development. By addressing frequently asked questions about regression testing, discussing its pros and cons, and highlighting its benefits, this comprehensive guide emphasizes its importance in maintaining software stability, enhancing user experience, and delivering high-quality software products. Incorporating regression testing into the software development process helps ensure that changes and additions do not compromise. Visit BTech

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