Is there a way to provide a
.plistjust for running the test?
No. This affects more than just Info.plist properties; you’ll see similar problems if your test code requires an entitlement. We definitely have bugs on file to improve this (r. 14493584) but, for the moment, the best solution is to host your test bundle in your app [1]. At that point, your app’s Info.plist, entitlements, and so on will apply.
To set this up, choose your app in the Product > Scheme > Edit Scheme > Run > Info > Executable popup for the test target.
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Quinn “The Eskimo!” @ DTS @ Apple
[1] Create a dummy test app if you don’t have one already.