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9 Reasons Why Regression Testing Is Important, Explained With Examples

Tarun Telang
Tarun Telang
9 Reasons Why Regression Testing Is Important, Explained With Examples
September 6, 2022
7
min read

Testing is an essential part of the software development process, and regression testing is one of the most critical types of testing. In this article, we'll explain what regression testing is, and why it's so important. We'll also provide some examples to help illustrate why regression testing is necessary.

What Is Regression Testing?

Regression testing is software testing that seeks to uncover new defects in existing functionality after changes (such as bug fixes or new features) have been made to the software. In short, it ensures that newly introduced changes haven't broken any existing functionality. For example, let's look at testing a registration form on a website. After making changes to the registration form, such as adding a new field, a regression test would ensure that the registration form still works correctly (e.g., that all the fields are still populated correctly, that the "submit" button works, etc.).

In this article, we'll discuss nine reasons why regression testing is important.

When to Perform Regression Testing

Regression testing is typically performed after significant changes have been made to the software's codebases, such as bug fixes, refactoring, or new features. It's also a good idea to perform regression tests before releasing a new software version. This helps ensure that the new version is stable and doesn't introduce any recent regressions. However, it can also be performed regularly as part of a more extensive suite of tests (such as system testing or acceptance testing) to help to keep the codebase healthy. It can catch defects early, before they have a chance to cause problems for users.

Top 9 Reasons Why Regression Testing Is Important

Regression testing has many benefits, which is why it's an essential part of the software development process. Below are the top reasons why regression testing is necessary.

1. Reduced Risk of Breaking Existing Functionality

One of the main reasons regression testing is important is that it helps reduce the risk of breaking existing functionality when making changes to the software. By thoroughly testing all the existing functionality after making changes, you can be confident that everything still works as it should. It means there is less risk of releasing a software update that breaks something that previously worked fine. For example, imagine you're a developer working on an e-commerce website. After adding a new feature, you run a regression test and discover that the checkout process is now broken. This would be a major problem for the website and would likely lead to lost sales and unhappy customers. By doing regression testing first, you can avoid such issues.

2. Increased Confidence in New Releases

Regression testing is important in that it helps to increase confidence in new releases. If you know that all the existing functionality still works after making changes, you can be confident that the software is stable and ready for release. This can be especially crucial if you're working on a critical system where downtime could lead to significant problems. For example, imagine you're working on a software update for an air traffic control system. If you release the update without doing regression testing, and it turns out that the update breaks something, the consequences could be disastrous. By doing regression testing, you can avoid such problems and have confidence that the software is ready for release.

When development teams properly perform regression testing, stakeholders can be confident that the software is still working as intended and that new changes haven't introduced any new defects. It's an integral part of ensuring the quality of the software and should be included in every software development cycle.

Regression testing is important in that it helps to increase confidence in new releases.

3. Improved Software Quality

Another reason the regression testing process is necessary is that it can help improve the software's overall quality. Uncovering functionality defects due to recent code changes can ensure that your development team fixes them before the software is released. It can help to prevent critical defects from making it into production, which could have considerable consequences. For example, imagine a problem in an e-commerce website that causes the site to crash when a customer attempts to checkout. If this defect is not found and fixed before the software is released, it could lead to lost revenue and a bad customer experience.

However, if it's found and fixed during regression testing, this helps improve the software's quality by preventing defects from occurring in the first place. By uncovering problems early, you can ensure that your development teams fix them before they have a chance to cause any problems. Regression testing can give stakeholders peace of mind by providing a safety net against potential issues.

4. Increased Software Stability

Yet another reason the regression testing process is necessary is that it helps increase the software's stability. Uncovering new defects in the software helps to make the software more stable and less likely to crash or malfunction. For example, regularly performing regression testing on an e-commerce application will keep discovering new defects in the application, which the development team can keep fixing. It'll improve the system's stability and reduce the number of crashes experienced by users.

5. Improved Customer Satisfaction

Regression testing is important because it can help to improve customer satisfaction. By making sure that the software works as expected, you can avoid customer complaints and negative feedback. For example, imagine you're working on a new feature for an e-commerce website. After adding the new feature, you run a regression test and discover that the checkout process is now broken. This would be a major problem for the website and would likely lead to a loss of customer trust. By doing regression testing, you can avoid such problems and keep your customers happy.

6. Faster Bug Fixing

Regression testing can also help to make bug fixes faster and more efficient. By finding defects early on, you can avoid the need for larger and more time-consuming fixes later on. For example, if a regression test reveals a defect in the checkout process of an e-commerce website, this can be fixed before it causes any major problems and before the bug gets further in the release pipeline.

7. Reduced Development and Maintenance Costs

Another reason why regression testing is important is that it can help to reduce development and maintenance costs. By finding and fixing defects early in the development process, you can avoid the need for expensive fixes later on. For example, imagine you're working on a new feature for an e-commerce website. During regression testing, you discover a defect that causes the site to crash when a customer attempts to checkout. If this defect is not found and fixed during development, it would need to be fixed in production, which would be much more expensive, time-consuming, and potentially riskier. However, if it's found and fixed during regression testing, the cost of fixing it is much lower.

8. Greater Efficiency in Development and Testing

Regression testing is essential because it can help make the development and testing process more efficient. It's crucial for large and complex software systems where manual testing would be impractical. Regression testing provides a cushion for rapid development and test teams, so that if something does break, it can be caught and fixed quickly. You can save time and resources by automating the execution of regression tests. It's much more efficient than manually testing each feature, and it helps to ensure that all the functionality still works as expected. For example, imagine you're working on new functionalities for an e-commerce website. After making changes to the code, you can automatically run a regression test suite to test all the existing functionality without burdening developers or testers directly.

It's crucial for large and complex software systems where manual testing would be impractical.

9. Helps You to Meet Your Goals

Finally, regression testing is important because it can help you to meet your development and testing goals. By automating the execution of regression tests, you can save time and resources. It's much more efficient than manually testing each feature, and it helps to ensure that all the functionality still works as expected. For example, if you're working on a new feature for an e-commerce website, you can automatically run a regression test suite to test all the existing functionality. This would help you to meet your goal of ensuring that the website works as expected, and it could help you meet goals of increased speed and productivity without sacrificing stability.

Conclusion

As you can see, there are many reasons why regression testing is important. It's essential for finding and fixing defects, reducing development and maintenance costs, improving customer satisfaction, and meeting your development and testing goals. If you're not doing regression testing, you should start as soon as possible. It'll help you create better software and avoid problems in the future.

Regression testing is not a panacea, but it's a valuable tool that can help make your software better. When done correctly, regression testing can be an invaluable asset to any software development team.

This post was written by Tarun Telang. Tarun is a software engineering leader with over 16 years of experience in the software industry with some of the world’s most renowned software development firms like Microsoft, Oracle, BlackBerry, and SAP. His areas of expertise include Java, web, mobile, and cloud. He’s also experienced in managing software projects using Agile and Test Driven Development methodologies.

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