{"id":4254,"date":"2023-05-02T21:00:21","date_gmt":"2023-05-03T03:00:21","guid":{"rendered":"https:\/\/scrumdigital.com\/blog\/?p=4254"},"modified":"2024-12-11T05:09:55","modified_gmt":"2024-12-11T12:09:55","slug":"what-is-regression-testing","status":"publish","type":"post","link":"https:\/\/scrumdigital.com\/blog\/what-is-regression-testing\/","title":{"rendered":"What is Regression Testing: Tools, Examples, and Methods"},"content":{"rendered":"

\u201cQuality is never an accident; it is always the result of intelligent effort\u201d. <\/span><\/i>-John Ruskin<\/span><\/i><\/p><\/blockquote>\n

Businesses often introduce new features and updates to their software and applications as part of their strategy to enhance employee and customer satisfaction levels.\u00a0<\/span><\/p>\n

A prime example is<\/span> ING<\/span>, the multinational financial services company, which regularly releases features to its web and mobile sites every three weeks, resulting in remarkable improvements in its customer satisfaction ratings.<\/span><\/p>\n

For agile businesses, continuous upgrades and innovations are crucial. However, it is equally important to ensure that the end-user experiences a seamless application experience.\u00a0<\/span><\/p>\n

In this blog, we will explore regression testing in-depth, including its definition, importance, and the various tools and methods used in its execution.\u00a0<\/span><\/p>\n

So let’s dive into the world of regression testing and uncover the tools, examples, and methods that make it a crucial aspect of software development.<\/span><\/p>\n

What is Regression Testing of Software?<\/h2>\n

Regression testing is an essential software testing practice that aims to ensure that an application continues to function as intended after any updates, code changes, or improvements.<\/span><\/p>\n

The primary goal of regression testing is to maintain the overall stability and functionality of existing features. Whenever there is a modification in the code, regression testing is employed to ensure that the system remains sustainable under continuous improvement.<\/span><\/p>\n

Code changes can introduce dependencies, defects, or malfunctions that may impact the application’s performance. Regression testing aims to mitigate these risks, ensuring that the previously tested and developed code remains operational even after new changes.<\/span><\/p>\n

Typically, an application undergoes multiple tests before changes are integrated into the primary development branch. Regression testing is the final step in the process, as it verifies the product’s behavior as a whole.<\/span><\/p>\n

Regression testing is generally employed in the following situations:<\/h4>\n
    \n
  1. When a new requirement is added to an existing feature.<\/span><\/li>\n
  2. When a new feature or functionality is introduced.<\/span><\/li>\n
  3. When defects are addressed by fixing the codebase.<\/span><\/li>\n
  4. When the source code is optimized to improve performance.<\/span><\/li>\n
  5. When patch fixes are incorporated.<\/span><\/li>\n
  6. When there are configuration changes.<\/span><\/li>\n<\/ol>\n

    Why is Regression Testing Important?<\/h3>\n

    In software development practices, test automation is a crucial element. Similarly, automated regression testing is also considered an essential component.<\/span><\/p>\n

    By implementing a rapid regression testing process, product teams can receive more insightful feedback and respond promptly.\u00a0<\/span>Regression testing can detect new bugs early in the deployment cycle, eliminating the need for businesses to incur costs and maintenance efforts to fix accumulated defects.\u00a0<\/span><\/p>\n

    Sometimes, even a seemingly minor modification can have a cascading effect on the product’s core functions.<\/span><\/p>\n

    Therefore, developers and testers must ensure that no change, no matter how small, is left outside the scope of their control.<\/span><\/p>\n

    Functional tests only evaluate the behavior of new features and capabilities, neglecting their compatibility with existing ones. Therefore, without regression testing, it becomes more challenging and time-consuming to investigate the root cause and architecture of the product.<\/span><\/p>\n

    Verdict<\/h4>\n

    When your product experiences frequent changes, regression testing serves as a means to maintain quality by verifying the product’s functionality as it is enhanced.<\/span><\/p>\n

    Types of Regression Testing<\/h3>\n

    \"Types<\/p>\n

    1. Unit Regression Testing<\/h4>\n

    refers to a testing method where the code is tested as a single entity, and if there are any minor changes made, testing is done only on the affected module and its dependent components. <\/span>Testers do not need to search for the areas of impact, and existing test cases can be modified or rewritten.<\/p>\n

    2. Regional Regression Testing<\/h4>\n

    involves testing the areas of the software that are affected by new feature releases or major enhancements to existing features. This testing method includes testing the changing unit and the impact area.\u00a0<\/span><\/p>\n

    Test cases are rewritten, old test cases are deleted, and new ones are added to the test case repository.\u00a0<\/span><\/p>\n

    Dependent features may also be affected, so it is necessary to identify the impact areas and test the dependent modules using old test cases.<\/span><\/p>\n

    3. Full Regression Testing<\/h4>\n

    is a comprehensive testing method that involves testing both the changed unit and independent old features of the application.\u00a0<\/span><\/p>\n

    This testing method is mostly used for life-critical or machine-critical applications, and it is also done during the product\/application development<\/a><\/strong> stage.<\/span><\/p>\n

    4. Release Level Regression Testing<\/h4>\n

    refers to testing during the second release of an application. It is done when organizations want to add new features or enhance existing ones, and a new release needs to be launched.\u00a0<\/span><\/p>\n

    This type of regression testing is focused on the impact area, and regression test cases are identified accordingly.<\/span><\/p>\n

    5. Build Level Regression Testing<\/h4>\n

    refers to testing during the second build of an upcoming release. It is done whenever there are changes to the code or bug fixes across builds. QA retests the bug fixes first, then the impact area.\u00a0<\/span><\/p>\n

    This process continues until a final stable build is obtained and given to the customer or when the product is launched. QA uses their product knowledge to identify the impact areas.<\/span><\/p>\n

    How To Do Regression Testing?<\/h3>\n

    \"How<\/p>\n

    1. Identify the scope of changes: <\/b>Understand the updates or modifications made to the software application, including bug fixes, new features, or performance improvements.<\/span><\/p>\n

    2. Determine the impact: <\/b>Assess the potential impact of these changes on existing functionality and identify the areas of the application that may be affected.<\/span><\/p>\n

    3. Update the test suite:<\/b> Review and update the existing test suite to include new test cases or modify existing ones as necessary to cover the changes.<\/span><\/p>\n

    4. Select test cases:<\/b> Choose the appropriate test cases for regression testing, which may involve using one or more of these techniques such as:<\/span><\/p>\n