chore: add GUT test framework

addons/gut/templates/singleton_list.txt

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+# Copy the Properties section from class_@globalscope.html and paste it in here.
+# Then run create_singleton_list.gd to generate documentation and code for
+# all listed singletons.
+AudioServer
+
+
+AudioServer
+
+CameraServer
+
+
+CameraServer
+
+ClassDB
+
+
+ClassDB
+
+DisplayServer
+
+
+DisplayServer
+
+EditorInterface
+
+
+EditorInterface
+
+Engine
+
+
+Engine
+
+EngineDebugger
+
+
+EngineDebugger
+
+GDExtensionManager
+
+
+GDExtensionManager
+
+Geometry2D
+
+
+Geometry2D
+
+Geometry3D
+
+
+Geometry3D
+
+IP
+
+
+IP
+
+Input
+
+
+Input
+
+InputMap
+
+
+InputMap
+
+JavaClassWrapper
+
+
+JavaClassWrapper
+
+JavaScriptBridge
+
+
+JavaScriptBridge
+
+Marshalls
+
+
+Marshalls
+
+NativeMenu
+
+
+NativeMenu
+
+NavigationMeshGenerator
+
+
+NavigationMeshGenerator
+
+NavigationServer2D
+
+
+NavigationServer2D
+
+NavigationServer2DManager
+
+
+NavigationServer2DManager
+
+NavigationServer3D
+
+
+NavigationServer3D
+
+NavigationServer3DManager
+
+
+NavigationServer3DManager
+
+OS
+
+
+OS
+
+Performance
+
+
+Performance
+
+PhysicsServer2D
+
+
+PhysicsServer2D
+
+PhysicsServer2DManager
+
+
+PhysicsServer2DManager
+
+PhysicsServer3D
+
+
+PhysicsServer3D
+
+PhysicsServer3DManager
+
+
+PhysicsServer3DManager
+
+ProjectSettings
+
+
+ProjectSettings
+
+RenderingServer
+
+
+RenderingServer
+
+ResourceLoader
+
+
+ResourceLoader
+
+ResourceSaver
+
+
+ResourceSaver
+
+ResourceUID
+
+
+ResourceUID
+
+TextServerManager
+
+
+TextServerManager
+
+ThemeDB
+
+
+ThemeDB
+
+Time
+
+
+Time
+
+TranslationServer
+
+
+TranslationServer
+
+WorkerThreadPool
+
+
+WorkerThreadPool
+
+XRServer
+
+
+XRServer