[Mono] Turn Samples into Functional Tests

src/libraries/IntegrationTests/Directory.Build.props

@@ -0,0 +1,5 @@
+<Project>
+  <PropertyGroup>
+  </PropertyGroup>
+  <Import Project="..\..\Directory.Build.props"/>
+</Project>

src/libraries/IntegrationTests/tests/iOS/Program.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Runtime.InteropServices;
+
+// it's not part of the BCL but runtime needs it for native-to-managed callbacks in AOT
+// To be replaced with NativeCallableAttribute
+public class MonoPInvokeCallbackAttribute : Attribute
+{
+    public MonoPInvokeCallbackAttribute(Type delegateType) { }
+}
+
+public static class Program
+{
+    // Defined in main.m
+    [DllImport("__Internal")]
+    private extern static void ios_set_text(string value);
+
+    [DllImport("__Internal")]
+    private extern static void ios_register_button_click(Action action);
+
+    private static Action buttonClickHandler = null;
+
+    private static int counter = 0;
+
+    // Called by native code, see main.m
+    [MonoPInvokeCallback(typeof(Action))]
+    private static void OnButtonClick()
+    {
+        ios_set_text("OnButtonClick! #" + counter++);
+    }
+
+    public static async Task Main(string[] args)
+    {
+        // Register a managed callback (will be called by UIButton, see main.m)
+        // Also, keep the handler alive so GC won't collect it.
+        ios_register_button_click(buttonClickHandler = OnButtonClick);
+
+        const string msg = "Hello World!\n.NET 5.0";
+        for (int i = 0; i < msg.Length; i++)
+        {
+            // a kind of an animation
+            ios_set_text(msg.Substring(0, i + 1));
+            await Task.Delay(100);
+        }
+
+        Console.WriteLine("Done!");
+        await Task.Delay(-1);
+    }
+}

src/libraries/IntegrationTests/tests/iOS/iOS.Integration.Tests.csproj

@@ -0,0 +1,88 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <OutputPath>bin</OutputPath>
+    <DebugType>Portable</DebugType>
+    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
+    <TargetOS>iOS</TargetOS>
+    <MicrosoftNetCoreAppRuntimePackDir>$(ArtifactsBinDir)microsoft.netcore.app.runtime.ios-$(TargetArchitecture)\$(Configuration)\runtimes\ios-$(TargetArchitecture)\</MicrosoftNetCoreAppRuntimePackDir>
+    <EnableTargetingPackDownload>false</EnableTargetingPackDownload>
+    <RuntimeIdentifier>ios-$(TargetArchitecture)</RuntimeIdentifier>
+    <PublishTrimmed>true</PublishTrimmed>
+    <_TrimmerDefaultAction>link</_TrimmerDefaultAction>
+    <Optimized Condition="'$(Configuration)' == 'Release'">True</Optimized>
+    <InvariantGlobalization>true</InvariantGlobalization> <!-- workaround for https://github.com/dotnet/runtime/issues/41866 -->
+    <RunAnalyzers>false</RunAnalyzers>
+  </PropertyGroup>
+
+  <!-- Redirect 'dotnet publish' to in-tree runtime pack -->
+  <Target Name="TrickRuntimePackLocation" AfterTargets="ProcessFrameworkReferences">
+    <ItemGroup>
+      <RuntimePack>
+        <PackageDirectory>$(ArtifactsBinDir)microsoft.netcore.app.runtime.ios-$(TargetArchitecture)\$(Configuration)</PackageDirectory>
+      </RuntimePack>
+    </ItemGroup>
+    <Message Text="Packaged ID: %(RuntimePack.PackageDirectory)" Importance="high" />
+  </Target>
+
+  <Import Project="$(RepoTasksDir)mobile.tasks\AotCompilerTask\MonoAOTCompiler.props" />
+  <UsingTask TaskName="AppleAppBuilderTask"
+             AssemblyFile="$(ArtifactsBinDir)AppleAppBuilder\$(Configuration)\$(NetCoreAppCurrent)\AppleAppBuilder.dll" />
+
+  <UsingTask TaskName="MonoAOTCompiler"
+             AssemblyFile="$(ArtifactsBinDir)MonoAOTCompiler\$(Configuration)\$(NetCoreAppCurrent)\MonoAOTCompiler.dll" />
+
+  <Target Name="BuildAppBundle" AfterTargets="CopyFilesToPublishDirectory">
+    <PropertyGroup>
+      <AppDir>$(MSBuildThisFileDirectory)$(PublishDir)\app</AppDir>
+      <IosSimulator Condition="'$(TargetArchitecture)' == 'x64' or '$(TargetArchitecture)' == 'x86'">iPhone 11</IosSimulator>
+    </PropertyGroup>
+
+    <RemoveDir Directories="$(AppDir)" />
+
+    <ItemGroup>
+      <BundleAssemblies Include="$(MSBuildThisFileDirectory)$(PublishDir)\*.dll" />
+      <AotInputAssemblies Include="$(MSBuildThisFileDirectory)$(PublishDir)\*.dll">
+        <AotArguments>@(MonoAOTCompilerDefaultAotArguments, ';')</AotArguments>
+        <ProcessArguments>@(MonoAOTCompilerDefaultProcessArguments, ';')</ProcessArguments>
+      </AotInputAssemblies>
+    </ItemGroup>
+
+    <MonoAOTCompiler
+        Condition="'$(IosSimulator)' == '' or '$(UseAotForSimulator)' == 'true'"
+        CompilerBinaryPath="$(MicrosoftNetCoreAppRuntimePackDir)native\cross\mono-aot-cross"
+        Mode="Full"
+        OutputType="AsmOnly"
+        Assemblies="@(AotInputAssemblies)"
+        UseLLVM="$(UseLLVM)"
+        LLVMPath="$(MicrosoftNetCoreAppRuntimePackDir)native\cross">
+        <Output TaskParameter="CompiledAssemblies" ItemName="BundleAssemblies" />
+    </MonoAOTCompiler>
+
+    <AppleAppBuilderTask
+        Arch="$(TargetArchitecture)"
+        ProjectName="HelloiOS"
+        MonoRuntimeHeaders="$(MicrosoftNetCoreAppRuntimePackDir)native\include\mono-2.0"
+        Assemblies="@(BundleAssemblies)"
+        MainLibraryFileName="Program.dll"
+        GenerateXcodeProject="True"
+        BuildAppBundle="True"
+        DevTeamProvisioning="$(DevTeamProvisioning)"
+        OutputDirectory="$(AppDir)"
+        Optimized="$(Optimized)"
+        UseAotForSimulator="$(UseAotForSimulator)"
+        AppDir="$(MSBuildThisFileDirectory)$(PublishDir)">
+        <Output TaskParameter="AppBundlePath" PropertyName="AppBundlePath" />
+        <Output TaskParameter="XcodeProjectPath" PropertyName="XcodeProjectPath" />
+    </AppleAppBuilderTask>
+
+    <Message Importance="High" Text="Xcode: $(XcodeProjectPath)"/>
+    <Message Importance="High" Text="App:   $(AppBundlePath)"/>
+
+    <Exec Condition="'$(IosSimulator)' != ''" Command="xcrun simctl shutdown &quot;$(IosSimulator)&quot;" ContinueOnError="WarnAndContinue" />
+    <Exec Condition="'$(IosSimulator)' != ''" Command="xcrun simctl boot &quot;$(IosSimulator)&quot;" />
+    <Exec Condition="'$(IosSimulator)' != ''" Command="open -a Simulator" />
+    <Exec Condition="'$(IosSimulator)' != ''" Command="xcrun simctl install &quot;$(IosSimulator)&quot; $(AppBundlePath)" />
+    <Exec Condition="'$(IosSimulator)' != ''" Command="xcrun simctl launch --console booted net.dot.HelloiOS" />
+  </Target>
+</Project>

src/libraries/IntegrationTests/tests/iOS/main.m

@@ -0,0 +1,80 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+#import <UIKit/UIKit.h>
+#import "runtime.h"
+
+@interface ViewController : UIViewController
+@end
+
+@interface AppDelegate : UIResponder <UIApplicationDelegate>
+@property (strong, nonatomic) UIWindow *window;
+@property (strong, nonatomic) ViewController *controller;
+@end
+
+@implementation AppDelegate
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
+    self.controller = [[ViewController alloc] initWithNibName:nil bundle:nil];
+    self.window.rootViewController = self.controller;
+    [self.window makeKeyAndVisible];
+    return YES;
+}
+@end
+
+UILabel *label;
+void (*clickHandlerPtr)(void);
+
+@implementation ViewController
+
+- (void)viewDidLoad {
+    [super viewDidLoad];
+
+    label = [[UILabel alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
+    label.textColor = [UIColor greenColor];
+    label.font = [UIFont boldSystemFontOfSize: 30];
+    label.numberOfLines = 2;
+    label.textAlignment = NSTextAlignmentCenter;
+    [self.view addSubview:label];
+
+    UIButton *button = [UIButton buttonWithType:UIButtonTypeInfoDark];
+    [button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
+    [button setFrame:CGRectMake(50, 300, 200, 50)];
+    [button setTitle:@"Click me" forState:UIControlStateNormal];
+    [button setExclusiveTouch:YES];
+    [self.view addSubview:button];
+
+    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+        mono_ios_runtime_init ();
+    });
+}
+-(void) buttonClicked:(UIButton*)sender
+{
+    if (clickHandlerPtr)
+        clickHandlerPtr();
+}
+
+@end
+
+// called from C# sample
+void
+ios_register_button_click (void* ptr)
+{
+    clickHandlerPtr = ptr;
+}
+
+// called from C# sample
+void
+ios_set_text (const char* value)
+{
+    NSString* nsstr = [NSString stringWithUTF8String:strdup(value)];
+    dispatch_async(dispatch_get_main_queue(), ^{
+        label.text = nsstr;
+    });
+}
+
+int main(int argc, char * argv[]) {
+    @autoreleasepool {
+        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+    }
+}

src/libraries/tests.proj

@@ -151,6 +151,10 @@
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Private.Xml.Linq\tests\xNodeReader\System.Xml.Linq.xNodeReader.Tests.csproj" />
   </ItemGroup>
 
+  <ItemGroup Condition="'$(TargetOS)' != 'iOS' and '$(TargetOS)' != 'tvOS'">
+    <ProjectExclusions Include="$(MSBuildThisFileDirectory)IntegrationTests\tests\iOS\iOS.Integration.Tests.csproj" />
+  </ItemGroup>
+
   <ItemGroup Condition="'$(TargetOS)' == 'Browser' and '$(RunDisabledWasmTests)' != 'true'">
     <!-- Mono-Browser ignores runtimeconfig.template.json (e.g. for this it has "System.Globalization.EnforceJapaneseEraYearRanges": true) -->
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Globalization.Calendars\tests\CalendarTestWithConfigSwitch\System.Globalization.CalendarsWithConfigSwitch.Tests.csproj" />