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Testing a private helper

A class has a private method calculateLateFee() used by the public method generateInvoice(). How should it usually be tested?

A.By making calculateLateFee() public just so the test can call itB.By using reflection to call calculateLateFee() directly in each testC.It does not need testing because private methods are internalD.Through generateInvoice(), checking the late fee in the invoice it returns

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Testing a private helper

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