Add TestIDView interface for _TestApp

Author: Kyle-Ye

Sources/OpenSwiftUI/Internal/Test/TestIDView.swift

@@ -0,0 +1,39 @@
+//
+//  TestIDView.swift
+//  OpenSwiftUI
+//
+//  Created by Kyle on 2023/1/9.
+//  Lastest Version: iOS 15.5
+//  Status: WIP
+
+internal import OpenGraphShims
+
+struct TestIDView<Content, ID>: PrimitiveView, UnaryView {
+    var content: Content
+    var id: ID
+    
+    init(content: Content, id: ID) {
+        self.content = content
+        self.id = id
+    }
+    
+    static func _makeView(view: _GraphValue<TestIDView<Content, ID>>, inputs: _ViewInputs) -> _ViewOutputs {
+        // Use IdentifiedView here
+        fatalError("TODO")
+    }
+}
+
+// TODO
+extension TestIDView {
+    struct IdentifiedView {
+        @Attribute
+        var view: TestIDView
+        var id: ID?
+    }
+}
+
+extension View {
+    func testID<ID: Hashable>(_ id: ID) -> some View {
+        TestIDView(content: self, id: id)
+    }
+}