Regression Testing
Introduction
Regression testing is a type of software testing that ensures that previously developed and tested software still performs the same way after it is changed or interfaced with other software. Changes may include software enhancements, patches, configuration changes, etc.
Purpose of Regression Testing
The primary purpose of regression testing is to discover any software bugs that may have been introduced inadvertently as a result of new changes in the software's functionality or environment. It is essential to perform regression testing as part of a software development process to ensure that the integrity of the software is maintained.
Types of Regression Testing
There are three main types of regression testing: unit regression, partial regression, and complete regression.
Unit Regression
Unit regression involves testing of individual components of the software system. This is typically done when changes have been made to those specific components, and it is necessary to ensure that they still function as expected.
Partial Regression
Partial regression testing involves testing of certain parts of the system, but not the entire system. This is typically done when changes have been made to a specific section of the software, and it is necessary to ensure that this section and any related sections still function as expected.
Complete Regression
Complete regression testing involves testing the entire system. This is typically done when significant changes have been made to the software, and it is necessary to ensure that the entire system still functions as expected.
Regression Testing Techniques
There are several techniques that can be used to perform regression testing, including retest all, selective, and prioritization.
Retest All
The retest all technique involves retesting the entire software system. This is the most thorough form of regression testing, but it can also be the most time-consuming and costly.
Selective
The selective technique involves retesting only the parts of the system that have been changed, as well as any parts that could be affected by those changes. This is a more efficient form of regression testing, but it requires a good understanding of the software system and the changes that have been made.
Prioritization
The prioritization technique involves retesting the parts of the system that are most likely to have been affected by the changes. This is an even more efficient form of regression testing, but it requires a good understanding of the software system, the changes that have been made, and the potential impact of those changes.
Regression Testing Tools
There are many tools available that can assist with regression testing, including both commercial and open-source options. Some of the most popular regression testing tools include Selenium, QTP, and RFT.
Conclusion
Regression testing is a critical part of the software development process. It ensures that changes to the software do not introduce new bugs and that the software continues to function as expected. By using the appropriate regression testing techniques and tools, it is possible to maintain the integrity of the software while minimizing the time and cost associated with testing.