Add AppearanceActionModifierTests (#206)

Author: Kyle-Ye

Example/HostingExample/ViewController.swift

@@ -55,10 +55,10 @@ struct ContentView: View {
                     first.toggle()
                 }
             }
-            // .id(first)
-//                .onDisappear {
-//                    print("Red disappear")
-//                }
+            .onDisappear {
+                print("Red disappear")
+            }
+            .id(first)
 //        } else {
 //            Color.blue
 //                .onAppear {

Sources/OpenSwiftUICore/View/IDView.swift

@@ -53,15 +53,16 @@ extension View {
 extension IDView {
     @usableFromInline
     package static func _makeView(view: _GraphValue<Self>, inputs: _ViewInputs) -> _ViewOutputs {
-        if _SemanticFeature_v2.isEnabled {
-            return makeImplicitRoot(view: view, inputs: inputs)
-        } else {
+        // Disable SemanticFeature_v2 temporary as makeImplicitRoot has not been implemented yet
+//        if _SemanticFeature_v2.isEnabled {
+//            return makeImplicitRoot(view: view, inputs: inputs)
+//        } else {
             let id = view.value[offset:{ .of(&$0.id) }]
             let phase = IDPhase(id: id, phase: inputs.viewPhase, lastID: nil, delta: 0)
             var inputs = inputs
             inputs.viewPhase = Attribute(phase)
             return Content.makeDebuggableView(view: view[offset: { .of(&$0.content)}], inputs: inputs)
-        }
+//        }
     }
 }
 

Tests/OpenSwiftUICompatibilityTests/SwiftUICore/Modifier/ViewModifier/AppearanceActionModifierTests.swift

@@ -2,9 +2,15 @@
 //  AppearanceActionModifierTests.swift
 //  OpenSwiftUICompatibilityTests
 
+#if canImport(Darwin)
 import Testing
 
-#if canImport(Darwin)
+import Foundation
+#if os(iOS)
+import UIKit
+#endif
+
+@MainActor
 struct AppearanceActionModifierTests {
     @Test
     func appear() async throws {
@@ -27,7 +33,42 @@ struct AppearanceActionModifierTests {
         }
         #endif
     }
-    
-    // TODO: Add disappear support and test case
+
+    #if !DEBUG || compiler(>=6.1)
+    // For Xcode 16.3-/Swift 6.1-, Xcode will infer OpaqueTypeErasure to be true which will make some difference to the result.
+    // And there is no way to opt-out it for package yet.
+    @Test
+    func idTest() async throws {
+        enum Helper {
+            @MainActor
+            static var result = ""
+        }
+
+        struct ContentView: View {
+            @State private var toggle = false
+
+            var body: some View {
+                Color.red
+                    .onAppear {
+                        Helper.result += "A"
+                        DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
+                            toggle.toggle()
+                        }
+                    }
+                    .onDisappear {
+                        Helper.result += "D"
+                    }
+                    .id(toggle)
+            }
+        }
+        #if os(iOS)
+        let vc = UIHostingController(rootView: ContentView())
+        vc.triggerLayout()
+        workaroundIssue87(vc)
+        try await Task.sleep(nanoseconds: 1 * 1_000_000_000)
+        #expect(Helper.result.hasPrefix("AAD"))
+        #endif
+    }
+    #endif
 }
 #endif