_Testing_AppKit cross-import overlay

_Testing_AppKit is a cross-import overlay that brings Swift Testing support to AppKit on macOS. It adds attachment encoding for NSImage representations, so that images produced during a test can be serialized into standard test image formats and attached to test results. Use it when you write Swift Testing tests for AppKit code and want to capture NSImage output as test attachments.

This module re-exports or extends other frameworks; it declares no public types of its own in the synthesized interface.