Regression Testing of an already tested program, after modification, to detect any defects introduced or uncovered as a result of the changes in the software being tested or in another related or unrelated software components.
In simple words, We do regression by re-executing the tests against the modified program to evaluate whether the altered code breaks anything that was working earlier. Anytime we do alter an application, we should do regression testing (we run regression test).
Regression testing provides confidence to the programmers that there's no broken functionality after changing the manufacturing code. It makes sure there are not any unexpected side effects. Hope you've understood what's regression tests. Now let us see when can we do this kind of analysis.
Regression Testing Example
Assume there is an application that has a performance to insert', 'Save', and delete'. These functions make it possible for users to add data, save data, and delete information. Now developers are creating a brand new attribute i.e.,' Update'. This feature permits users to edit and update the information. As a programmer, you have to verify the debut of a new attribute (ie., Update) affecting the present features (such as insert', 'Save', and publish' works ) or not.
What are the types of Regression Testing?
- Unit Regression
- Partial Regression
- Complete Regression
1. Unit Regression
Unit Regression Testing is completed during the unit testing phase and the code is analyzed as one unit with no dependencies. Dependencies if some are briefly obstructed to test the device independently.
2. Partial Regression
Partial Regression Testing implies if regression testing is completed on a module where the shift in the code is related to that specific module and there won't be any change impact on other modules.
3. Complete Regression
Complete Regression Testing means if regression testing is done on a number of modules where the change in the code is connected to another module is uncertain.
Regression Testing -- Manual or Automation?
Regression tests are generally extremely tedious and time-consuming. We do regression after every deployment, therefore it might make life easy to automate test cases instead of running manually every time. If we have tens of thousands of test cases, it is better to create automation test scripts for the test cases which we do on each construct (i.e., regression testing)
Automated regression test is the best practice and it's the choice of organizations to conserve a good deal of time and also to run nightly builds.
The Challenges of Regression Testing:
There are a few challenges in doing regression testing, even though it plays an important part in the QA procedure.
Proper Tool
Choosing the appropriate tool plays a key role in the achievement of regression test automation. If we select an unsuitable tool then regression test automation will end up time-consuming and won't create good ROI.
Resources
To use the chosen tool in a proper manner to create decent ROI, we need to have skilled resources that may use the tool effectively.
Test Coverage
To conquer time consumption, we must decrease the test suites. We might not achieve maximum test coverage when minimizing the test suites.
Nowadays, the majority of the associations are after Agile practices. Agile works in an iterative and incremental method. Developers work on new functionality and release them every 2-4 months as sprint release. In agile, it is sure that for each 2-4 weeks after there will be a signal change. In cases like this, the regression tests help in analysing the new code change in every iteration to be certain that the analysed program continues to carry out correctly after every iteration.
Following are a few of the best practices to be followed while doing this testing:
- Select the test instances that cause regular defects.
- Select the workflow which has more visibility to your users.
- Conduct regression tests after smoke and sanity testing.
- Conduct regression tests at the conclusion of functional testing.
- Possessing a regression test plan handy.
- Run regression test instances regularly to avoid the release risk in another build.
- Use the right tool to accelerate the evaluation procedure.
- Select all integration test instances, complex test cases, boundary value test cases.
Automated Regression Test Tools:
In most cases, the program undergoes frequent adjustments and we spent a lot of time to perform these regression test instances and which contributes to high-cost and time-consuming.
To avoid these problems we can select automated regression tests.
Automation testing is a great way to run regression tests in an effective and economical way. It also helps testers to not examine the repeated and dull tests.
Generally, regression test suites need to be updated frequently. So while picking a tool to your requirements guarantee that the tool has the power to upgrade a test suite.
Katalon: Katalon studio includes Katalon Recorder which acts as a record and playback instrument. Katalon Studio IDE supports the creation of test cases in Java and groovy.
For a detailed explanation of these regression testing tools, check out our article on Best Regression Testing Tools.
If you think we missed some of the popular Regression Test Tools, then please comment below and we will attempt to incorporate them.
Conclusion:
Regression testing saves time and money. It assists organizations to produce a quality product by ensuring that the code change shouldn't affect the existing functionality.
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