[tests] Add .NET Xamarin.Forms test app.

tests/dotnet/MyXamarinFormsApp/AppDelegate.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+using Foundation;
+using UIKit;
+
+namespace MyXamarinFormsApp.iOS
+{
+	// The UIApplicationDelegate for the application. This class is responsible for launching the 
+	// User Interface of the application, as well as listening (and optionally responding) to 
+	// application events from iOS.
+	[Register ("AppDelegate")]
+	public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
+	{
+		//
+		// This method is invoked when the application has loaded and is ready to run. In this 
+		// method you should instantiate the window, load the UI into it and then make the window
+		// visible.
+		//
+		// You have 17 seconds to return from this method, or iOS will terminate your application.
+		//
+		public override bool FinishedLaunching (UIApplication app, NSDictionary options)
+		{
+			global::Xamarin.Forms.Forms.Init ();
+			LoadApplication (new App ());
+
+			return base.FinishedLaunching (app, options);
+		}
+	}
+}

tests/dotnet/MyXamarinFormsApp/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+    "images": [
+        {
+            "scale": "2x",
+            "size": "20x20",
+            "idiom": "iphone",
+            "filename": "Icon40.png"
+        },
+        {
+            "scale": "3x",
+            "size": "20x20",
+            "idiom": "iphone",
+            "filename": "Icon60.png"
+        },
+        {
+            "scale": "2x",
+            "size": "29x29",
+            "idiom": "iphone",
+            "filename": "Icon58.png"
+        },
+        {
+            "scale": "3x",
+            "size": "29x29",
+            "idiom": "iphone",
+            "filename": "Icon87.png"
+        },
+        {
+            "scale": "2x",
+            "size": "40x40",
+            "idiom": "iphone",
+            "filename": "Icon80.png"
+        },
+        {
+            "scale": "3x",
+            "size": "40x40",
+            "idiom": "iphone",
+            "filename": "Icon120.png"
+        },
+        {
+            "scale": "2x",
+            "size": "60x60",
+            "idiom": "iphone",
+            "filename": "Icon120.png"
+        },
+        {
+            "scale": "3x",
+            "size": "60x60",
+            "idiom": "iphone",
+            "filename": "Icon180.png"
+        },
+        {
+            "scale": "1x",
+            "size": "20x20",
+            "idiom": "ipad",
+            "filename": "Icon20.png"
+        },
+        {
+            "scale": "2x",
+            "size": "20x20",
+            "idiom": "ipad",
+            "filename": "Icon40.png"
+        },
+        {
+            "scale": "1x",
+            "size": "29x29",
+            "idiom": "ipad",
+            "filename": "Icon29.png"
+        },
+        {
+            "scale": "2x",
+            "size": "29x29",
+            "idiom": "ipad",
+            "filename": "Icon58.png"
+        },
+        {
+            "scale": "1x",
+            "size": "40x40",
+            "idiom": "ipad",
+            "filename": "Icon40.png"
+        },
+        {
+            "scale": "2x",
+            "size": "40x40",
+            "idiom": "ipad",
+            "filename": "Icon80.png"
+        },
+        {
+            "scale": "1x",
+            "size": "76x76",
+            "idiom": "ipad",
+            "filename": "Icon76.png"
+        },
+        {
+            "scale": "2x",
+            "size": "76x76",
+            "idiom": "ipad",
+            "filename": "Icon152.png"
+        },
+        {
+            "scale": "2x",
+            "size": "83.5x83.5",
+            "idiom": "ipad",
+            "filename": "Icon167.png"
+        },
+        {
+            "scale": "1x",
+            "size": "1024x1024",
+            "idiom": "ios-marketing",
+            "filename": "Icon1024.png"
+        }
+    ],
+    "properties": {},
+    "info": {
+        "version": 1,
+        "author": "xcode"
+    }
+}

tests/dotnet/MyXamarinFormsApp/Directory.Build.targets

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+<Project>
+
+  <PropertyGroup Condition="'$(_PlatformName)' == 'iOS'">
+    <PublishTrimmed>True</PublishTrimmed>
+    <MonoAOT>True</MonoAOT>
+    <UseAppHost>False</UseAppHost>
+  </PropertyGroup>
+
+  <Target
+    Name="FixFormsNuGetAssemblies"
+    AfterTargets="ResolvePackageAssets"
+    Condition="'$(PkgXamarin_Forms)' != '' And '$(_PlatformName)' == 'iOS'">
+    <ItemGroup>
+      <!-- NOTE: the items below are workarounds for $(AssetTargetFallback) usage -->
+      <!-- see: https://github.com/NuGet/docs.microsoft.com-nuget/issues/1955 -->
+      <Reference Include="Xamarin.Forms.Platform.iOS" HintPath="$(PkgXamarin_Forms)\build\XCODE11\Xamarin.Forms.Platform.iOS.dll" />
+      <Reference Include="Xamarin.Forms.Platform" HintPath="$(PkgXamarin_Forms)\lib\Xamarin.iOS10\Xamarin.Forms.Platform.dll" />
+      <RuntimeCopyLocalItems          Remove="$(PkgXamarin_Forms)\lib\netstandard2.0\Xamarin.Forms.Platform.dll" />
+      <ResolvedCompileFileDefinitions Remove="$(PkgXamarin_Forms)\lib\netstandard2.0\Xamarin.Forms.Platform.dll" />
+    </ItemGroup>
+
+  </Target>
+</Project>

tests/dotnet/MyXamarinFormsApp/Entitlements.plist

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+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+</dict>
+</plist>
+

tests/dotnet/MyXamarinFormsApp/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>UIDeviceFamily</key>
+    <array>
+        <integer>1</integer>
+        <integer>2</integer>
+    </array>
+    <key>UISupportedInterfaceOrientations</key>
+    <array>
+        <string>UIInterfaceOrientationPortrait</string>
+        <string>UIInterfaceOrientationLandscapeLeft</string>
+        <string>UIInterfaceOrientationLandscapeRight</string>
+    </array>
+    <key>UISupportedInterfaceOrientations~ipad</key>
+    <array>
+        <string>UIInterfaceOrientationPortrait</string>
+        <string>UIInterfaceOrientationPortraitUpsideDown</string>
+        <string>UIInterfaceOrientationLandscapeLeft</string>
+        <string>UIInterfaceOrientationLandscapeRight</string>
+    </array>
+    <key>MinimumOSVersion</key>
+    <string>8.0</string>
+    <key>CFBundleDisplayName</key>
+    <string>MyXamarinFormsApp</string>
+    <key>CFBundleIdentifier</key>
+    <string>com.xamarin.MyXamarinFormsApp</string>
+    <key>CFBundleVersion</key>
+    <string>1.0</string>
+    <key>UILaunchStoryboardName</key>
+    <string>LaunchScreen</string>
+    <key>CFBundleName</key>
+    <string>MyXamarinFormsApp</string>
+    <key>XSAppIconAssets</key>
+    <string>Assets.xcassets/AppIcon.appiconset</string>
+</dict>
+</plist>

tests/dotnet/MyXamarinFormsApp/Main.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+using Foundation;
+using UIKit;
+
+namespace MyXamarinFormsApp.iOS
+{
+	public class Application
+	{
+		// This is the main entry point of the application.
+		static void Main (string [] args)
+		{
+			// if you want to use a different Application Delegate class from "AppDelegate"
+			// you can specify it here.
+			UIApplication.Main (args, null, "AppDelegate");
+		}
+	}
+}

tests/dotnet/MyXamarinFormsApp/MyXamarinFormsApp.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net6.0-ios</TargetFramework>
+    <RuntimeIdentifier>ios-x64</RuntimeIdentifier>
+    <OutputType>Exe</OutputType>
+    <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <DefaultItemExcludes>$(DefaultItemExcludes);MyXamarinFormsAppNS\**</DefaultItemExcludes>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Forms" Version="4.5.0.617" GeneratePathProperty="true" />
+    <PackageReference Include="Xamarin.Essentials" Version="1.1.0" />
+    <!-- The linker resolves some assembly references too eagerly, and fails when it can't find them, so work around this by referencing the missing assemblies-->
+    <!-- ref: https://github.com/mono/linker/issues/1139 -->
+    <PackageReference Include="System.Security.Permissions" Version="5.0.0-preview.2.20160.6" />
+    <PackageReference Include="System.Threading.AccessControl" Version="5.0.0-preview.2.20160.6" />
+    <PackageReference Include="System.CodeDom" Version="5.0.0-preview.2.20160.6" />
+    <PackageReference Include="System.Configuration.ConfigurationManager" Version="5.0.0-preview.2.20160.6" />
+    <PackageReference Include="System.Diagnostics.PerformanceCounter" Version="5.0.0-preview.2.20160.6" />
+    <PackageReference Include="System.Diagnostics.EventLog" Version="5.0.0-preview.2.20160.6" />
+    <PackageReference Include="System.IO.Ports" Version="5.0.0-preview.2.20160.6" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="MyXamarinFormsAppNS\MyXamarinFormsAppNS.csproj" />
+  </ItemGroup>
+</Project>

tests/dotnet/MyXamarinFormsApp/MyXamarinFormsAppNS/App.xaml

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+<?xml version="1.0" encoding="utf-8"?>
+<Application xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:d="http://xamarin.com/schemas/2014/forms/design" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="MyXamarinFormsApp.App">
+    <Application.Resources>
+    </Application.Resources>
+</Application>

tests/dotnet/MyXamarinFormsApp/MyXamarinFormsAppNS/App.xaml.cs

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+using System;
+using Xamarin.Forms;
+using Xamarin.Forms.Xaml;
+
+namespace MyXamarinFormsApp
+{
+	public partial class App : Application
+	{
+		public App ()
+		{
+			InitializeComponent ();
+
+			MainPage = new MainPage ();
+		}
+
+		protected override void OnStart ()
+		{
+			// Handle when your app starts
+		}
+
+		protected override void OnSleep ()
+		{
+			// Handle when your app sleeps
+		}
+
+		protected override void OnResume ()
+		{
+			// Handle when your app resumes
+		}
+	}
+}

tests/dotnet/MyXamarinFormsApp/MyXamarinFormsAppNS/AssemblyInfo.cs

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+using Xamarin.Forms.Xaml;
+
+[assembly: XamlCompilation (XamlCompilationOptions.Compile)]

tests/dotnet/MyXamarinFormsApp/MyXamarinFormsAppNS/MainPage.xaml

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+<?xml version="1.0" encoding="utf-8"?>
+<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:d="http://xamarin.com/schemas/2014/forms/design" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="MyXamarinFormsApp.MainPage">
+    <StackLayout>
+        <!-- Place new controls here -->
+        <Label Text="Welcome to Xamarin.Forms!" HorizontalOptions="Center" VerticalOptions="CenterAndExpand" />
+    </StackLayout>
+</ContentPage>

tests/dotnet/MyXamarinFormsApp/MyXamarinFormsAppNS/MainPage.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Xamarin.Forms;
+
+namespace MyXamarinFormsApp
+{
+	// Learn more about making custom code visible in the Xamarin.Forms previewer
+	// by visiting https://aka.ms/xamarinforms-previewer
+	[DesignTimeVisible (false)]
+	public partial class MainPage : ContentPage
+	{
+		public MainPage ()
+		{
+			InitializeComponent ();
+		}
+	}
+}

tests/dotnet/MyXamarinFormsApp/MyXamarinFormsAppNS/MyXamarinFormsAppNS.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <ProduceReferenceAssembly>true</ProduceReferenceAssembly>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Forms" Version="4.0.0.540366" />
+    <PackageReference Include="Xamarin.Essentials" Version="1.1.0" />
+  </ItemGroup>
+</Project>

tests/dotnet/MyXamarinFormsApp/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle ("MyXamarinFormsApp.iOS")]
+[assembly: AssemblyDescription ("")]
+[assembly: AssemblyConfiguration ("")]
+[assembly: AssemblyCompany ("")]
+[assembly: AssemblyProduct ("MyXamarinFormsApp.iOS")]
+[assembly: AssemblyCopyright ("Copyright ©  2014")]
+[assembly: AssemblyTrademark ("")]
+[assembly: AssemblyCulture ("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible (false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid ("72bdc44f-c588-44f3-b6df-9aace7daafdd")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion ("1.0.0.0")]
+[assembly: AssemblyFileVersion ("1.0.0.0")]

tests/dotnet/MyXamarinFormsApp/Resources/LaunchScreen.storyboard

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6245" systemVersion="13F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="X5k-f2-b5h">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6238" />
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="gAE-YM-kbH">
+            <objects>
+                <viewController id="X5k-f2-b5h" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Y8P-hJ-Z43" />
+                        <viewControllerLayoutGuide type="bottom" id="9ZL-r4-8FZ" />
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="yd7-JS-zBw">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600" />
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES" />
+                        <subviews>
+                            <imageView userInteractionEnabled="NO" contentMode="scaleToFill" misplaced="YES" image="Icon-60.png" translatesAutoresizingMaskIntoConstraints="NO" id="23">
+                                <rect key="frame" x="270" y="270" width="60" height="60" />
+                                <rect key="contentStretch" x="0.0" y="0.0" width="0.0" height="0.0" />
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" red="0.20392156862745098" green="0.59607843137254901" blue="0.85882352941176465" alpha="1" colorSpace="calibratedRGB" />
+                        <constraints>
+                            <constraint firstItem="23" firstAttribute="centerY" secondItem="yd7-JS-zBw" secondAttribute="centerY" priority="1" id="39" />
+                            <constraint firstItem="23" firstAttribute="centerX" secondItem="yd7-JS-zBw" secondAttribute="centerX" priority="1" id="41" />
+                        </constraints>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="XAI-xm-WK6" userLabel="First Responder" sceneMemberID="firstResponder" />
+            </objects>
+            <point key="canvasLocation" x="349" y="339" />
+        </scene>
+    </scenes>
+    <resources>
+        <image name="Icon-60.png" width="180" height="180" />
+    </resources>
+</document>