Optimize Benchmark summary output (#376)

Author: Kyle-Ye

Example/Example/BenchmarkApp.swift

@@ -19,7 +19,8 @@ import UIKit
 struct BenchmarkApp {
     static func main() {
         _TestApp().runBenchmarks([
-            Benchmark(),
+            RedBenchmark(),
+            BlueBenchmark(),
         ])
     }
 }
@@ -36,10 +37,17 @@ extension UIHostingController: _ViewTest where Content == AnyView {
 #endif
 
 struct PerformanceTest: _PerformanceTest {
-    var name = "RedColor Test"
+    var name: String { "PerformanceTest" }
+
+    let view: AnyView
+
+    init(_ view: some View) {
+        self.view = AnyView(view)
+    }
+
     func runTest(host: _BenchmarkHost, options: [AnyHashable : Any]) {
         #if os(iOS)
-        let test = _makeUIHostingController(AnyView(RedColor())) as! UIHostingController<AnyView>
+        let test = _makeUIHostingController(view) as! UIHostingController<AnyView>
         test.setUpTest()
         test.render()
         test._forEachIdentifiedView { proxy in
@@ -52,7 +60,6 @@ struct PerformanceTest: _PerformanceTest {
         test.tearDownTest()
         #endif
     }
-
 }
 
 struct RedColor: View {
@@ -63,15 +70,29 @@ struct RedColor: View {
     }
 }
 
-struct Benchmark: _Benchmark {
-    func setUpTest() {
-        print("DSF")
+struct BlueColor: View {
+    var id: String { "BlueColor" }
+
+    var body: some View {
+        Color.blue._identified(by: id)
+    }
+}
+
+struct RedBenchmark: _Benchmark {
+    func measure(host: _BenchmarkHost) -> [Double] {
+        return [
+            host.measureAction {
+                PerformanceTest(RedColor()).runTest(host: host, options: [:])
+            },
+        ]
     }
+}
 
+struct BlueBenchmark: _Benchmark {
     func measure(host: _BenchmarkHost) -> [Double] {
         return [
             host.measureAction {
-                PerformanceTest().runTest(host: host, options: [:])
+                PerformanceTest(BlueColor()).runTest(host: host, options: [:])
             },
         ]
     }

Sources/OpenSwiftUICore/Test/Benchmark.swift

@@ -82,18 +82,14 @@ extension _BenchmarkHost {
 }
 
 package func summarize(_ measurements: [(any _Benchmark, [Double])]) -> String {
-    let benchmarkData = measurements.map { (String(describing: $0.0), $0.1) }
-    
+    let benchmarkData = measurements.map { (String(describing: type(of: $0.0)), $0.1) }
     let maxNameLength = benchmarkData.map { $0.0.count }.max() ?? 0
-    
     let results: [String] = benchmarkData.map { (name, values) in
+        let total = values.reduce(0, +)
         let padding = maxNameLength - name.count + 1
         let paddingString = String(repeating: " ", count: padding)
-        
-        let average = values.reduce(0, +) / Double(values.count)
-        let milliseconds = average * 1000.0
-        
-        return "\(name)\(paddingString): \(String(format: "%.3f", milliseconds))ms"
+        let milliseconds = total * 1000.0
+        return "\(name):\(paddingString)\(String(format: "%.3f ms", milliseconds))"
     }
     return results.joined(separator: "\n")
 }