Regression testing is the process of testing modifications to computer programs to make sure that the earlier programming still performs with the new changes. Conducting the previous tests and ensuring the existing functionalities due to the latest modification is the basis of regression testing. Regression testing is a normal part of the program development process. Regression testing is done by functional testing specialists. The existing test cases are executed in sequence.Coding team develop code test scenarios and exercises that will test new units of code after they have been written. Before a new version of a software product is released, the test cases are run against the new version to make sure that all the earlier functionalities work.
The selective retesting of a software system that has been modified to ensure that all bugs have been fixed and that no other previously working functions have failed as a result of the new modifications and that newly added features have not resulted in conflicts with previous versions of the software. Regression Testing is sometimes referred to as verification testing. Regression testing is initiated after a developer has attempted to fix a recognized problem or has added source code to a program that may have inadvertently introduced errors.
It is a quality control measure to ensure that the newly modified code still complies with its specified requirements and that unmodified code has not been affected by the maintenance activity. Regression testing identifies when code modifications cause previously-working functionality to regress. The purpose of regression testing is to detect unexpected fault, especially those that occur because a developer did not fully understand the internal code correlations when modifying or extending code. Every time code is modified or used in a new environment, regression testing should be used to check the codes integrity.
Ideally, regression testing is performed to ensure that errors are detected and fixed as soon as possible. Regression testing should be tightly linked to functional testing, and be built from the successful test cases developed and used in functional testing. During regression testing, specified test cases are run and current results are compared to previous result data.
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