Checks for `ProjectDescriptionHelpers`

Hey!

There is currently no built-in way how to unit test helpers. What you could is to additionally define your helpers as a local Swift package and run tests using that.

Tuist/ProjectDescriptionHelpers
# Defines a local package that would test your ProjectDescriptionHelpers
Tuist/ProjectDescriptionHelpersTests/Package.swift 

In the Package.swift, you’d additionally need to import the ProjectDescription framework – either by importing tuist/tuist as a package or passing the right flags pointing to the ProjectDescription installed on your system and invoke the tests using xcodebuild (such as /Users/marekfort/.local/share/mise/installs/tuist/4.40.0/bin/ProjectDescription.framework).

Alternatively, you can consider linting the generated project by running tuist graph --format json and then ensuring your graph has the expected structure or build phases. The output JSON is an encoded variant of XcodeGraph that you can use as a Swift package and make the linting easier.