[One .NET] Add Microsoft.Android-Tests unit tests

A new version of Mono.Android-Tests has been added to run against the
.NET 6 SDK:

 * `tests/Mono.Android-Tests/Runtime-Microsoft.Android.Sdk/Mono.Android.NET-Tests.csproj`

To support this, new .NET .csproj files have been added alongside all of
the existing legacy Xamarin.Android unit test library projects.  These
projects target `net5.0-android` and build against our .NET 6 SDK:

 * `src/Mono.Android/Test/Java.Interop-Tests/Java.Interop-Tests.NET.csproj`
 * `src/Mono.Android/Test/Mono.Android-Test.Library/Mono.Android-Test.Library.NET.csproj`
 * `src/Xamarin.Android.NUnitLite/Xamarin.Android.NUnitLite.NET.csproj`
 * `tests/TestRunner.Core/TestRunner.Core.NET.csproj`
 * `tests/TestRunner.NUnit/TestRunner.NUnit.NET.csproj`

The `_CreateAar` target was being skipped for the new Java.Interop-Tests.NET
project, as it had no inputs.  As a result, the `Mono.Android-Test-classes.jar`
file required by these tests was not being included in the application project.
To fix this, I've added `@(AndroidJavaLibrary)` to `@(_CreateAarInputs)` so that
these items will also be considered as inputs for this target/task.

build-tools/automation/azure-pipelines.yaml

@@ -588,6 +588,27 @@ stages:
         artifactName: com.companyname.vsandroidapp-Signed.apk
         artifactFolder: Default
 
+    - task: MSBuild@1
+      displayName: run Mono.Android.NET_Tests
+      inputs:
+        solution: tests/Mono.Android-Tests/Runtime-Microsoft.Android.Sdk/Mono.Android.NET-Tests.csproj
+        configuration: $(ApkTestConfiguration)
+        msbuildArguments: /t:RunDotNetInstrumentation
+      continueOnError: true
+
+    - script: >
+        mkdir -p $(Build.ArtifactStagingDirectory)/OneDotNet &&
+        cp "$(System.DefaultWorkingDirectory)/bin/Test$(ApkTestConfiguration)/net5.0-android/Mono.Android.NET_Tests-Signed.apk" "$(Build.ArtifactStagingDirectory)/OneDotNet"
+      displayName: copy apk/aab
+      continueOnError: true
+
+    - task: PublishTestResults@2
+      displayName: publish Mono.Android.NET_Tests results
+      inputs:
+        testResultsFormat: NUnit
+        testResultsFiles: TestResult-Mono.Android.NET_Tests-$(ApkTestConfiguration).xml
+        testRunTitle: Mono.Android.NET_Tests
+
     - task: MSBuild@1
       displayName: shut down emulator
       inputs:

build-tools/xaprepare/xaprepare/Scenarios/Scenario_Required.cs

@@ -21,7 +21,6 @@ protected override void AddSteps (Context context)
 			// Install essential tools, should they be missing
 			context.SetCondition (KnownConditions.EnsureEssential, true);
 
-			Steps.Add (new Step_InstallDotNetPreview ());
 			Steps.Add (new Step_GenerateFiles (atBuildStart: true, onlyRequired: true));
 			Steps.Add (new Step_PrepareExternalJavaInterop ());
 		}

src-ThirdParty/NUnitLite/Internal/TestExecutionContext.cs

@@ -34,7 +34,7 @@
 #endif
 
 using NUnit.Framework.Api;
-#if !SILVERLIGHT && !NETCF
+#if !SILVERLIGHT && !NETCF && !NET
 using System.Runtime.Remoting.Messaging;
 #endif
 
@@ -53,7 +53,7 @@ namespace NUnit.Framework.Internal
 	/// object on the top of the stack.
 	/// </summary>
 	public class TestExecutionContext
-#if !SILVERLIGHT && !NETCF
+#if !SILVERLIGHT && !NETCF && !NET
 		: ILogicalThreadAffinative
 #endif
 	{

src/Mono.Android/Properties/AssemblyInfo.cs.in

@@ -31,3 +31,4 @@ using System.Runtime.CompilerServices;
 [assembly: InternalsVisibleTo("Java.Interop-Tests, PublicKey=0024000004800000940000000602000000240000525341310004000011000000438ac2a5acfbf16cbd2b2b47a62762f273df9cb2795ceccdf77d10bf508e69e7a362ea7a45455bbf3ac955e1f2e2814f144e5d817efc4c6502cc012df310783348304e3ae38573c6d658c234025821fda87a0be8a0d504df564e2c93b2b878925f42503e9d54dfef9f9586d9e6f38a305769587b1de01f6c0410328b2c9733db")]
 [assembly: InternalsVisibleTo("Mono.Android-TestsMultiDex, PublicKey=0024000004800000940000000602000000240000525341310004000011000000438ac2a5acfbf16cbd2b2b47a62762f273df9cb2795ceccdf77d10bf508e69e7a362ea7a45455bbf3ac955e1f2e2814f144e5d817efc4c6502cc012df310783348304e3ae38573c6d658c234025821fda87a0be8a0d504df564e2c93b2b878925f42503e9d54dfef9f9586d9e6f38a305769587b1de01f6c0410328b2c9733db")]
 [assembly: InternalsVisibleTo("Mono.Android-TestsAppBundle, PublicKey=0024000004800000940000000602000000240000525341310004000011000000438ac2a5acfbf16cbd2b2b47a62762f273df9cb2795ceccdf77d10bf508e69e7a362ea7a45455bbf3ac955e1f2e2814f144e5d817efc4c6502cc012df310783348304e3ae38573c6d658c234025821fda87a0be8a0d504df564e2c93b2b878925f42503e9d54dfef9f9586d9e6f38a305769587b1de01f6c0410328b2c9733db")]
+[assembly: InternalsVisibleTo("Mono.Android.NET-Tests, PublicKey=0024000004800000940000000602000000240000525341310004000011000000438ac2a5acfbf16cbd2b2b47a62762f273df9cb2795ceccdf77d10bf508e69e7a362ea7a45455bbf3ac955e1f2e2814f144e5d817efc4c6502cc012df310783348304e3ae38573c6d658c234025821fda87a0be8a0d504df564e2c93b2b878925f42503e9d54dfef9f9586d9e6f38a305769587b1de01f6c0410328b2c9733db")]

src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.AndroidLibraries.targets

@@ -66,6 +66,7 @@ projects.
       <_CreateAarInputs Include="@(AndroidAsset)" />
       <_CreateAarInputs Include="@(_AndroidResourceDest)" />
       <_CreateAarInputs Include="@(AndroidEnvironment)" />
+      <_CreateAarInputs Include="@(AndroidJavaLibrary)" />
       <_CreateAarInputs Include="@(EmbeddedJar)" />
       <_CreateAarInputs Include="@(EmbeddedNativeLibrary)" />
     </ItemGroup>

src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/CodeBehindTests.cs

@@ -155,7 +155,7 @@ static CodeBehindTests ()
 			CommonSampleLibraryRootDirectory = Path.GetFullPath (Path.Combine (XABuildPaths.TopDirectory, "tests", "CodeBehind", CommonSampleLibraryName));
 			TestOutputDir = Path.Combine (XABuildPaths.TestOutputDirectory, "temp", "CodeBehind");
 			if (Builder.UseDotNet) {
-				ProjectName += "DotNet";
+				ProjectName += ".NET";
 			}
 
 			generated_sources = new List <SourceFile> {

src/Xamarin.Android.NUnitLite/Xamarin.Android.NUnitLite.NET.csproj

@@ -0,0 +1,35 @@
+<Project Sdk="Microsoft.NET.Sdk" >
+
+  <PropertyGroup>
+    <TargetFramework>net5.0-android</TargetFramework>
+    <OutputType>Library</OutputType>
+    <RootNamespace>Xamarin.Android.NUnitLite</RootNamespace>
+    <SignAssembly>true</SignAssembly>
+    <AssemblyOriginatorKeyFile>..\..\product.snk</AssemblyOriginatorKeyFile>
+    <AndroidApplication>false</AndroidApplication>
+    <NoStdLib>true</NoStdLib>
+    <!-- Disable XML doc warnings:
+         CS1570: XML comment has badly formed XML - 'Whitespace is not allowed at this location.'
+         CS1572: XML comment has a param tag for 'Bar', but there is no parameter by that name
+         CS1591: Missing XML comment for publicly visible type or member 'Foo'
+    -->
+    <NoWarn>1570;1572;1591</NoWarn>
+    <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
+  </PropertyGroup>
+
+  <Import Project="..\..\build-tools\scripts\MonoAndroidFramework.props" />
+
+  <PropertyGroup>
+    <DebugSymbols>true</DebugSymbols>
+    <Optimize>false</Optimize>
+    <OutputPath>..\..\bin\$(Configuration)\lib\xamarin.android\xbuild-frameworks\Microsoft.Android\</OutputPath>
+    <DefineConstants>$(DefineConstants);NUNITLITE;CLR_4_0;NET_4_5;__MOBILE__;MONOTOUCH</DefineConstants>
+    <DocumentationFile>$(OutputPath)\$(AssemblyName).xml</DocumentationFile>
+    <GenerateDocumentation>True</GenerateDocumentation>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Include="..\..\src-ThirdParty\NUnitLite\**\*.cs" />
+  </ItemGroup>
+
+</Project>