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Why is regression testing important?
2
When to perform regression testing?
3
How to perform regression testing?
4
What tools to use for regression testing?
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5
How to select test cases for regression testing?
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Here’s what else to consider
Regression testing is a type of software testing that ensures that existing functionality is not affected by new changes or updates. It helps to verify that the software behaves as expected after modifications, bug fixes, or enhancements. Regression testing is essential for maintaining software quality, reliability, and performance.
Key takeaways from this article
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Implement a smoke suite:
Before diving into full regression testing, run a preliminary check with a smoke test suite to verify the system's stability. This initial step ensures that your application is ready for the more detailed and extensive testing that follows.
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Prioritize test cases:
Focus on high-impact areas by conducting an impact analysis to select essential test cases. This strategy helps you identify what needs your attention first, ensuring that high-risk changes are thoroughly tested.
This summary is powered by AI and these experts
- Alexandre Brambilla Quality Assurance Specialist | QA | QA…
- Diego Luís R. SrBA
1 Why is regression testing important?
Regression testing is important because it helps to detect and prevent errors that could compromise the software functionality, usability, or security. Without regression testing, new changes could introduce unexpected bugs, break existing features, or cause performance issues. Regression testing also helps to ensure that the software meets the requirements and specifications of the customers and stakeholders.
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- Diego Luís R. SrBA
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Products and its features have improvements constantly, so it a must that the previous functionalities keep working no matter the updates made. Regression testing is required to validate that the product is working in the planned way, still keeps the expected performance, merge old and new features with no issues and meets other specifications on cross requirements
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Regression testing is basically done to retest the existing features so the newly added requirement does not bring any error or production issue. It is basically done to delivery highly qualified product. Devops ,jira are some of the tools used.
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2 When to perform regression testing?
Regression testing should be performed whenever there is a change in the software code, configuration, or environment. For example, regression testing should be done after adding new features, fixing bugs, refactoring code, integrating components, updating libraries, or migrating to a different platform. Regression testing should also be done before releasing the software to the end-users or deploying it to the production environment.
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Regression testing should be performed whenever there are changes or updates to a software application. This includes after bug fixes, feature additions, or code modifications. The goal is to ensure that new changes haven't adversely affected existing functionality. It's typically done as part of the software development lifecycle, either after each development iteration or before a release.
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A regression testing should be made when there are changes in the code by solving bugs, making updates or adding new features. However, it is necessary to also know when to apply the regression testing. It should be the last step after making the required adjustment, should not be run everytime a single bug has been solved or too much time will be expended unnecessarily. Scheduling this testings will help to optimize efforts, time and of course money.
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3 How to perform regression testing?
Regression testing can be performed manually or automatically, depending on the scope, complexity, and frequency of the changes. Manual regression testing involves executing test cases by human testers, following predefined steps and scenarios. Manual regression testing is suitable for small-scale changes, exploratory testing, or testing complex or dynamic scenarios. However, manual regression testing can be time-consuming, costly, and prone to human errors.
Automated regression testing involves using tools or scripts to execute test cases automatically, without human intervention. Automated regression testing is suitable for large-scale changes, repetitive testing, or testing stable or simple scenarios. Automated regression testing can save time, money, and resources, and improve accuracy and consistency.
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Regression testing can be done manually or automatically. Manual testing involves testers executing test cases step by step, which works well for smaller changes or complex scenarios. Automated testing, on the other hand, uses tools or scripts to perform tests automatically, saving time and ensuring consistency, making it ideal for larger changes or repetitive testing.
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The regression testing can be made manually, automatically or a combination of both. Depending on the product, features and scope of the product, taking a decision on how to test it will vary. In my personal experience, using automated testing helps when the product keeps evolving as features are not removed but added constantly over time. When the product is small and starts getting shape, manual regression testing can be the better option to save time and money; but once the product gets more robust, applying automated testing will save time, effort and money. I recommend to have in mind automated testing for the regression phase. Just imagine how much time and money google have saved by automating this phase each time an update is made.
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4 What tools to use for regression testing?
When it comes to regression testing, there are many tools available that cater to different types, levels, and languages of software. Selenium is a popular open-source tool for web-based applications that supports multiple browsers, platforms, and languages. TestComplete is a commercial tool for desktop, web, and mobile applications with support for various technologies, platforms, and languages. Katalon Studio is a free tool for web, mobile, and API testing with support for various technologies, platforms, and languages. JUnit is an open-source tool for Java-based applications that facilitates unit testing, integration testing, and functional testing. PyTest is another open-source tool for Python-based applications that supports unit testing, integration testing, and functional testing. All of these tools can be used to create and run automated regression tests using various frameworks and libraries.
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5 How to select test cases for regression testing?
When selecting test cases for regression testing, it is essential to consider various techniques and criteria, such as impact analysis, risk analysis, prioritization, and optimization. Impact analysis involves identifying the areas or components affected by the changes and selecting the test cases that cover them. Risk analysis assesses the likelihood and severity of errors due to the changes and selects test cases that cover high-risk areas or components. Additionally, prioritization ranks test cases based on their importance, relevance, or complexity and selects those with the highest priority or value. Finally, optimization eliminates or reduces redundant, obsolete, or irrelevant test cases and selects the most optimal or sufficient ones.
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6 Here’s what else to consider
This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?
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- Alexandre Brambilla Quality Assurance Specialist | QA | QA Engineer
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One thing I’ve found helpful is to have a well planned and fast paced smoke suite before starting any regression whatsoever. Regression tests are EXPENSIVE, and you need to make sure that the application and/or environment is ready to be tested.
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