Learn Regression Testing:-
The selective retesting of a
system that has been modified to ensure that any
bugs have been
fixed and that no other previously working functions have failed as a result of
the reparations and that newly added features have not created problems with
previous versions of the software.
Also referred to as
verification testing, regression testing is initiated after a
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
Regression means going back.
With testing processes we mean that you need to repeat previously successful
tests any time there is a chance that subsequent changes could have affected an
aspect of the solution.
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The testing process involved
building a sequence of tests, many of which stood upon the successful results of
earlier tests. If a component of the solution has been changed, all other
components which relied upon it might have been affected. Similarly, all tests
that relied on an earlier test might no long be valid. Consider carefully which
solution and testing components need to be re-validated.
One consequence of this issue
is that changes during the testing process are bad news. There will always be
errors and changes during the testing, but it might be better to defer the
correction of some minor problems to make better overall progress. A seemingly
innocuous example with a big hidden catch is when a software supplier suggests
that a problem you are experiencing would be solved by moving to their next
software release in which the problem has been fixed. Moving to a new release
probably means that every test you did to date is now invalidated and will have
to be repeated.
Regression testing can be used
not only for testing the correctness of a program, but it is also often
used to track the quality of its output. For instance in the design of a
regression testing should track the code size, simulation time, and compilation
time of the test suites.
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