Regression testing is the process of testing changes to computer programs to make sure that the older programming still works with the new changes. Regression testing is a normal part of the program development process and, in larger companies, is done by code testing specialists. Test department coders develop code test scenarios and exercises that will test new units of code after they have been written. These test cases form what becomes the test bucket. Before a new version of a software product is released, the old test cases are run against the new version to make sure that all the old capabilities still work. The reason they might not work is because changing or adding new code to a program can easily introduce errors into code that is not intended to be changed.
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Regression testing is something every programmer should do after changing the code. Elderly individuals sometimes undergo a remarkable regression to a childlike state. The military's observers reported the regression of the country to a feudal state.
A regression test is a test where a previously known bug is tested for after a change. A retest is simply repeating a test.
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.
By changing the permiability of ferromagnetic meterials, surface and near surface discontinuities are traced, is the principle of magnetic particle testing. By changing the permiability of ferromagnetic meterials, surface and near surface discontinuities are traced, is the principle of magnetic particle testing.