Xcode test to check files Target Membership

Let's say that I have an app with two targets: the app itself (1) and a today widget (2).

These two share some files/data (json files, or whatever) stored in the app bundle.

These files/data have to have Target Membership on both the app AND the today widget (to be accessible on both).

How can I create a Xcode XCTest that checks if the two target memberships have been setup?