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Since a software bug is detected and fixed then the software product should be re-tested to guarantee that the original fault has been removed with success. You should also think over testing for alike and connected defects.
Software tests should be repeatable to permit regression/re-testing testing. Regression testing attempts to confirm that alterations have not caused unpremeditated negative side effects in the unchanged software (regression defects) and that the modified system still satisfies its requirements. It is performed since the software, or its environment, is modified.
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