We do have troubles getting our CI to work with Xcode. We encounter the issue Could not determine bundle identifier for xxxTest TEST_HOST: some path that does not exist
One reason to have this error is that your info.plist of your target is not in its path. So if you moved it or removed the reference to it, you may get this error.
So if you moved it, put it back into its place or path. if you removed the reference to it, add it again, close and reopen the project.