Define Custom Tests in Xcode project template

I am using a custom app project template and I would like to also include custom Test files (or implementation) when I select to add Swift Testing or XCTest.

What should I add to my TemplateInfo.plist to either extend or override the default templates?

This is not documented by Apple and it's hard to figure out. Thanks in advance for any help.

Define Custom Tests in Xcode project template
 
 
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