It is running the same tests that found the error again after an error has been fixed to ensure it has been fixed and no other errors have been introduced as a result of what was done.
regression testing is normally a set of automated scripts written by the test/automation team to test all previously existing functionality to make sure nothing has been broken.
Regression is the re-test of the existing features of your softwares. Criterias: -If one of the requirements is enhanced or changed or modified then the affected other software modules should also be tested as regression test. -If the already released software modules are having issues at end customer side and they have reported bugs in them...Then you will come to know the most affected module and can perform regression test in next release.
unit tests are a collection of tests written by a developer during the software development process. Module tests are a collection of tests written by a tester after some code has been written by a developer.
The selection of test cases for regression testing:Requires knowledge on the bug fixes and how it affect the systemIncludes the area of frequent defectsIncludes the area which has undergone many/recent code changesIncludes the area which is highly visible to the usersIncludes the core features of the product which are mandatory requirements of the customerSelection of test cases for regression testing depends more on the criticality of bug fixes than the criticality of the defect itself. A minor defect can result in major side effect and a bug fix for an Extreme defect can have no or a just a minor side effect. So the test engineer needs to balance these aspects for selecting the test cases for regression testing.Read the Complete article at:http://www.onestopsoftwaretesting.com/2009/10/selecting-test-cases-for-regression.html
Conventional testing is the traditional approach to testing mostly done when water fall life cycle is used for development, while object oriented testing is used when object oriented analysis and design is used for developing enterprise software. Conventional testing focuses more on decomposition and functional approaches as opposed to object oriented testing, which uses composition. The three levels of testing (system, integration, unit) used in conventional testing is not clearly defined when it comes to object oriented testing. The main reason for this is that OO development uses incremental approach, while traditional development follows a sequential approach. In terms of unit testing, object oriented testing looks at much smaller units compared to conventional testing.
Unit regression testing Regional regression testing Full regression testing
Regression testing.
regression testing is a white box testng
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To complete testing application if any modification done any modules or functionality that is called regression testing.
Regression testing is intended to uncover any bug that may have been introduced in the application as a side effect of fixing some other bug. So all the test cases are run. This is different from Unit testing, where we run only unit tests for the unit where we fixed the bug. Stress testing stresses particular functionality so see where is will break etc. For example a good stress test for MS Word may be to open a file in MS Word and keep writing text to it till it breaks.
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Regression are classified as - Full / Complete Regression -- Entire application is regressed - Regional regression -- Tests performed around defect fixes or code changes
system testing is a kind of retesting where we can test whole system after integration. while regression testing is a process where we do the rerunning the test cases and check whether that re run doesnot affects the real environment.
Regression testing is an iterative process executed throughout the software development and testing cycle. Regression testing focuses on previously tested aspects, features which were tested and found working, or bugs which were found and confirmed fixed, in earlier versions of the software. The purpose of regression testing is to make sure that those previously verified features still work. For example, consider a software release that includes two new features, A and B. While the developers are still working on feature B, test is already examining feature A. When A is found working as planned, testing proceeds to feature B, while regression testing affirms that nothing in feature B broke A.
Regression testing is a type of software testing that seeks to uncover new software bugs, or regressions, in existing functional and non-functional areas of a system after changes such as enhancements, patches or configuration changes, have been made to them.