Add OpenSwiftUI UITest target support (#80)

* Update Example project

* Add OpenSwiftUIUITests

Author: Kyle-Ye

Configurations/Example.xcconfig

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+PRODUCT_BUNDLE_IDENTIFIER=org.OpenSwiftUIProject.OpenSwiftUI.Example

Configurations/HostingExample.xcconfig

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+PRODUCT_BUNDLE_IDENTIFIER=org.OpenSwiftUIProject.OpenSwiftUI.HostingExample

Configurations/OpenSwiftUIUITests.xcconfig

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+PRODUCT_BUNDLE_IDENTIFIER=org.OpenSwiftUIProject.OpenSwiftUI.OpenSwiftUIUITests

Configurations/Shared/OpenSwiftUI-debug.xcconfig

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+#include "basic/OpenSwiftUI.xcconfig"
+#include "basic/debug.xcconfig"

Configurations/Shared/OpenSwiftUI-release.xcconfig

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+#include "basic/OpenSwiftUI.xcconfig"
+#include "basic/release.xcconfig"

Configurations/Shared/SwiftUI-debug.xcconfig

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+#include "basic/SwiftUI.xcconfig"
+#include "basic/debug.xcconfig"

Configurations/Shared/SwiftUI-release.xcconfig

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+#include "basic/SwiftUI.xcconfig"
+#include "basic/release.xcconfig"

Configurations/Shared/basic/OpenSwiftUI.xcconfig

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+GCC_PREPROCESSOR_DEFINITIONS = $(inherited) OPENSWIFTUI=1
+SWIFT_ACTIVE_COMPILATION_CONDITIONS = $(inherited) OPENSWIFTUI

Configurations/Shared/basic/SwiftUI.xcconfig

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+GCC_PREPROCESSOR_DEFINITIONS = $(inherited) DEBUG=1
+SWIFT_ACTIVE_COMPILATION_CONDITIONS = $(inherited) DEBUG

Configurations/Shared/basic/common.xcconfig

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+PRODUCT_BUNDLE_IDENTIFIER=org.OpenSwiftUIProject.OpenSwiftUI.TestHost

Configurations/Shared/basic/debug.xcconfig

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+//
+//  FB13341321.swift
+//  Test
+//
+//  Created by Kyle on 2023/11/6.
+//
+
+// (4 toggles: C1T1 C1T2 C2T1 C2T2 - C1T1&C2T1 use the same truth, C1T2&C2T2 use the same truth )
+// macOS 14 behavior with SwiftUI
+// C1T1's UI will only be updated at most 1 time if we only tap T1.
+// C2T1 will always reflect the latest value in UI. A tap for T2 will make C1T1's UI up to data.
+// Tap on C1T2 or C2T2 will update both toggle at the same time. (Expected)
+//
+// iOS 17 behavior with SwiftUI
+// Tap on C2T1 will only update toggle C2T1 while the UI of C1T1 remains the same.
+// Tap on C1T1 will update both toggle(C1T1 & C2T1) at the same time. (Expected)
+// Tap on C1T2 or C2T2 will update both toggle at the same time. (Expected)
+//
+// iOS 15.5 behavior with SwiftUI
+// Tap on C1T1 or C2T1 will update both toggle at the same time. (Expected)
+// Tap on C1T2 or C2T2 will update both toggle at the same time. (Expected)
+// But one is with transactino and the other is not.
+
+import SwiftUI
+import Observation
+
+@available(iOS 14, *)
+enum FB13341321 {
+    public struct Section: View {
+
+        public let content: AnyView
+
+        public init(
+            @ViewBuilder content: @escaping () -> some View
+        ) {
+
+            self.content = content().eraseToAnyView()
+        }
+
+        public var body: some View {
+            content
+        }
+    }
+
+    @resultBuilder
+    public struct SectionBuilder {
+        public static func buildBlock(_ sections: Section...) -> [Section] {
+            sections
+        }
+    }
+    public struct Container: View {
+        private let builder: () -> [Section]
+
+        public init(
+            @SectionBuilder builder: @escaping () -> [Section]
+        ) {
+            self.builder = builder
+        }
+
+        public var body: some View {
+            let sections = builder()
+            return sections[0]
+        }
+    }
+
+    public struct Container2: View {
+        private let sections: [Section]
+
+        public init(
+            sections: [Section] = []
+        ) {
+            self.sections = sections
+        }
+
+        public var body: some View {
+            return sections[0]
+        }
+    }
+
+    struct ContentView: View {
+        @AppStorage("Test") private var toggle = false
+        @State private var toggle2 = false
+        var body: some View {
+            Container {
+                Section {
+                    Toggle("Demo Toggle", isOn: $toggle)
+                    Toggle("Demo Toggle2", isOn: $toggle2)
+                }
+            }
+            Container2(sections: [
+                Section {
+                    Toggle("Demo Toggle", isOn: $toggle)
+                    Toggle("Demo Toggle2", isOn: $toggle2)
+                }
+            ])
+        }
+    }
+}
+
+extension View {
+    func eraseToAnyView() -> AnyView {
+        AnyView(self)
+    }
+}
+
+@available(iOS 14, *)
+#Preview {
+    FB13341321.ContentView()
+        .padding(20)
+}

Configurations/Shared/basic/release.xcconfig

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+//
+//  AnyViewTests.swift
+//  OpenSwiftUIUITests
+
+import XCTest
+
+#if OPENSWIFTUI
+import OpenSwiftUI
+#else
+import SwiftUI
+#endif
+
+#if os(iOS)
+import UIKit
+
+#if !OPENSWIFTUI
+@available(iOS 15, *)
+#endif
+final class AnyViewTests: XCTestCase {
+    // @Test("Attribute setter crash for basic AnyView", .bug("https://github.com/OpenSwiftUIProject/OpenGraph/issues/58", relationship: .verifiesFix))
+    func testBasicAnyView() throws {
+        struct ContentView: View {
+            var body: some View {
+                AnyView(EmptyView())
+            }
+        }
+        let vc = UIHostingController(rootView: ContentView())
+        let window = UIWindow(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
+        window.rootViewController = vc
+        window.makeKeyAndVisible()
+        vc.view.layoutSubviews()
+    }
+}
+#endif