Add BenchmarkApp example for TestApp API

Example/Example/BenchmarkApp.swift

@@ -0,0 +1,78 @@
+//
+//  BenchmarkApp.swift
+//  Example
+//
+//  Created by Kyle on 2025/6/23.
+//
+//  Modified from https://gist.github.com/edudnyk/74ed8d3801004a6dcaab09868b522187
+
+#if OPENSWIFTUI
+import OpenSwiftUI
+#else
+import SwiftUI
+#endif
+
+#if os(iOS)
+import UIKit
+#endif
+
+struct BenchmarkApp {
+    static func main() {
+        _TestApp().runBenchmarks([
+            Benchmark(),
+        ])
+    }
+}
+#if os(iOS)
+extension UIHostingController: _Test where Content == AnyView {}
+extension UIHostingController: _ViewTest where Content == AnyView {
+    public func initRootView() -> AnyView {
+        return rootView
+    }
+    public func initSize() -> CGSize {
+        sizeThatFits(in: UIScreen.main.bounds.size)
+    }
+}
+#endif
+
+struct PerformanceTest: _PerformanceTest {
+    var name = "RedColor Test"
+    func runTest(host: _BenchmarkHost, options: [AnyHashable : Any]) {
+        #if os(iOS)
+        let test = _makeUIHostingController(AnyView(RedColor())) as! UIHostingController<AnyView>
+        test.setUpTest()
+        test.render()
+        test._forEachIdentifiedView { proxy in
+            let state = test.stateForIdentifier(proxy.identifier, type: Bool.self, in: type(of: test.rootView))
+            let view = test.viewForIdentifier(proxy.identifier, AnyView.self)
+            print("IDENTIFIER: \(proxy)")
+            print("STATE: \(state)")
+            print("VIEW: \(view)")
+        }
+        test.tearDownTest()
+        #endif
+    }
+
+}
+
+struct RedColor: View {
+    var id: String { "RedColor" }
+
+    var body: some View {
+        Color.red._identified(by: id)
+    }
+}
+
+struct Benchmark: _Benchmark {
+    func setUpTest() {
+        print("DSF")
+    }
+
+    func measure(host: _BenchmarkHost) -> [Double] {
+        return [
+            host.measureAction {
+                PerformanceTest().runTest(host: host, options: [:])
+            },
+        ]
+    }
+}

Example/Example/ExampleApp.swift

@@ -12,6 +12,17 @@ import SwiftUI
 #endif
 
 @main
+struct EntryPoint {
+    static func main() {
+        let runBenchmark = CommandLine.arguments.contains("benchmark")
+        if runBenchmark {
+            BenchmarkApp.main()
+        } else {
+            ExampleApp.main()
+        }
+    }
+}
+
 struct ExampleApp: App {
     var body: some Scene {
         WindowGroup {