I am new to QA. i want to know how testers test when they have to input credita card numbers, SSN, driver license number or bank account numbers
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I'm not clear on most of what you are saying, but usually if I need to add various numbers I use fake versions of them, so long as they are accepted by the application. If your application has validation routines you will need to create numbers that will pass the validation. Using real information, especially in a test environment where many people have access, is not a wise idea.
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"So as I struggle with this issue I am confronted with the reality that noting is perfect."