Not sure if it's exactly what you're after, but you can have different unit test bundles use different locations (or GPX files) by setting it up in the scheme.
You could then have unit tests in each bundle which test what you need regarding that specific location.
xctool can also just run the unit tests in a specific target using the -only option:
path/to/xctool.sh
-workspace YourWorkspace.xcworkspace
-scheme YourScheme
test -only SomeTestTarget
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