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A.
During mock
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B.
As desired by the tester and After each module completion
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C.
During test planning
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D.
As soon as possible
Correct Option: DExplanation:
As soon as possible is a correct answer. It is best practice to start writing unit tests as soon as the code for a module or feature is complete, as this allows for early identification and resolution of any issues before the application is fully developed. This approach also helps ensure that the code is written in a testable manner from the start.