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Regression Testing
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| Regression testing is the process of running
all existing test cases and verifying that all test cases
pass. The purpose of regression testing is to detect unexpected
faults--especially those faults that occur because a developer
did not fully understand the internal code correlations
when he or she modified or extended code that previously
functioned correctly. Regression testing is the only reliable
way to ensure that modifications did not introduce new errors
into code or to check whether modifications successfully
eliminated existing errors. Every time code is modified
or used in a new environment, regression testing should
be used to check the code's integrity. Ideally, you perform
regression testing nightly (during automated nightly builds)
to ensure that errors are detected and fixed as soon as
possible.
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