Yes, you can list Modifier Item IDs in a test Barcode, but keep in mind the system will treat it as a Base Item and assign a price point to it.
So if in reality your Modifier typically has a price point of $0.00, it is not recommended to use Test Barcodes when testing a campaign that is specifically targeting modifiers.
Instead, it's recommended that you use the Test Qualification Criteria option in the Qualification Criteria set up.
Related articles:
How do I test a Post Check-in Campaign Offer?
How do I test my Qualification Criteria to ensure checks discount as expected?
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