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Confirmation testing is also known as re-testing.Confirmation Testing is done to make sure that the tests cases which failed in last execution are passing after the defects against those failures are fixed.
For Example:
Suppose you were testing some software application and you found defects in some component.
1. You log a defect in bug tracking tool.
2. Developer will fix that defect and provide you with the official testable build.
3. You need to re-run the failed test cases to make sure that the previous failures are gone.
This is known as confirmation Testing or Re-testing
While doing confirmation testing it is very important that a tester should execute the test case in exactly the same way as it was executed for the first time. Tester should use the same input data and test environment. If the test case passes this time then this ensures that the defect got fixed and tester can close that defect.
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