I want to add a test to ensure #packageManifest answers a Class.

Since RPackage is in RPackageCore, but the #packageManifest method is in Manifest-Core
I'm not sure whether:

  1. I have to make the test in RPackageTest but make the test method from the Manifest-Core package
  2. I have to make the test in RPackageTest but make the test method from the Manifest-Tests package
  3. Create a new class in Manifest-Tests to hold this new test (and someupcoming tests as well)

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