![]() ![]() This technique checks all the test cases on the current program to check its integrity. The various regression testing techniques are: Developer testing compels a developer to focus on unit testing and to include both positive and negative test cases. ![]() Although developers have always written test cases as part of the development cycle, these test cases have generally been either functional tests or unit tests that verify only intended outcomes. ![]() This problem is being addressed by the rise of unit testing. However, defects found at this stage are the most costly to fix. In the corporate world, regression testing has traditionally been performed by a software quality assurance team after the development team has completed work. Regression testing is done after functional testing has concluded, to verify that the other functionalities are working. In this method, design documents are replaced by extensive, repeatable, and automated testing of the entire software package throughout each stage of the software development process. Regression testing is an integral part of the extreme programming software development method. Those strategies can be automated by an external tool. Ĭommon strategies are to run such a system after every successful compile (for small projects), every night, or once a week. Such a test suite contains software tools that allow the testing environment to execute all the regression test cases automatically some projects even set up automated systems to re-run all regression tests at specified intervals and report any failures (which could imply a regression or an out-of-date test). Īlthough this may be done through manual testing procedures using programming techniques, it is often done using automated testing tools. Therefore, in most software development situations, it is considered good coding practice, when a bug is located and fixed, to record a test that exposes the bug and re-run that test regularly after subsequent changes to the program. Frequently, a fix for a problem in one area inadvertently causes a software bug in another area.įinally, it may happen that, when some feature is redesigned, some of the same mistakes that were made in the original implementation of the feature are made in the redesign. Often, a fix for a problem will be " fragile" in that it fixes the problem in the narrow case where it was first observed but not in more general cases which may arise over the lifetime of the software. Sometimes re-emergence occurs because a fix gets lost through poor revision control practices (or simple human error in revision control). Sometimes a change impact analysis is performed to determine an appropriate subset of tests ( non-regression analysis ).Īs software is updated or changed, or reused on a modified target, emergence of new faults and/or re-emergence of old faults is quite common. The evident exception is the GUIs regression testing, which normally must be executed manually. As regression test suites tend to grow with each found defect, test automation is frequently involved. If not, that would be called a regression.Ĭhanges that may require regression testing include bug fixes, software enhancements, configuration changes, and even substitution of electronic components. Regression testing (rarely, non-regression testing ) is re-running functional and non-functional tests to ensure that previously developed and tested software still performs as expected after a change. ![]()
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