This question appears in Mumbai University > Software Testing & Quality Assurance Subject

Marks: 10 M

Year: Dec 2014

Need of Regression Testing

Regression Testing is required when there is a

• Change in requirements and code is modified according to the requirement

• New feature is added to the software

• Defect fixing

• Performance issue fix

Retest All

• This is one of the methods for regression testing in which all the tests in the existing test bucket or suite should be re-executed. This is very expensive as it requires huge time and resources.

Regression Test Selection

• Instead of re-executing the entire test suite, it is better to select part of test suite to be run • Test cases selected can be categorized as 1) Reusable Test Cases 2) Obsolete Test Cases. • Re-usable Test cases can be used in succeeding regression cycles. • Obsolete Test Cases can't be used in succeeding cycles.

Prioritization of Test Cases

• Prioritize the test cases depending on business impact, critical & frequently used functionalities . Selection of test cases based on priority will greatly reduce the regression test suite.

Selecting test cases for regression testing

It was found from industry data that good number of the defects reported by customers were due to last minute bug fixes creating side effects and hence selecting the test case for regression testing is an art and not that easy. Effective Regression Tests can be done by selecting following test cases -

• Test cases which have frequent defects

• Functionalities which are more visible to the users

• Test cases which verify core features of the product

• Test cases of Functionalities which has undergone more and recent changes

• All Integration Test Cases

• All Complex Test Cases

• Boundary value test cases

• Sample of Successful test cases

• Sample of Failure test cases