The question is not about the desire or will not be approved by the application, since it includes the integration of payments, but rather
Apple analysts awaiting end-to-end payment process testing will work as intended?
Although I can not give a definitive answer as to whether they will be or not. I would suggest that if this is the functionality of your application, then expect it to be tested. Therefore, it may be worth adding some dummy elements at the lowest prices (which you can tell them) in case they want to test. This is their money.
If you turn it around - if they have not tested the functionality, then applications that may not work as expected, or be buggy, will be approved, and this will be tantamount to unhappy players.
As long as you inform them of the dummy elements and that they are present only to verify the approval (and will be deleted at the end of the approval process), then you will be protected if they decide to test or not.
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