generator unit tests now supports DIM-supported csc via nuget package.

The idea is in the same mindset as existing Windows Roslyn support
in terms of access to package contents (dll/exe).

I couldn't enable this for ALL projects as java.lang.Object test somehow
failed. We only need it only if DIM is required, so limit the usage to it.

Author: atsushieno

tools/generator/Tests/Integration-Tests/Compiler.cs

@@ -4,6 +4,8 @@
 using System.IO;
 using System.Linq;
 using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text;
 using NUnit.Framework;
 
 namespace generatortests
@@ -67,6 +69,46 @@ public static Assembly Compile (Xamarin.Android.Binder.CodeGeneratorOptions opti
 			parameters.IncludeDebugInformation = false;
 #endif
 
+			if (options.SupportDefaultInterfaceMethods) {
+				var sb = new StringBuilder ();
+				sb.Append (" /t:library")
+				  .Append (" /unsafe")
+				  .Append (" /langversion:latest")
+				  .Append (' ').Append ($"/out:\"{assemblyFileName}\"");
+				foreach (var assembly in parameters.ReferencedAssemblies)
+					sb.Append ($" /r:\"{assembly}\"");
+				if (parameters.IncludeDebugInformation)
+					sb.Append (" /debug:portable");
+				foreach (var sourceFile in sourceFiles)
+					sb.Append (' ').Append ($"\"{sourceFile}\"");
+				string compiler = Path.GetFullPath (Path.Combine (unitTestFrameworkAssemblyPath, "..", "..", "..", "packages", "xamarin.android.csc.dim.0.1.2", "tools", "csc.exe"));
+				var pinfo = new ProcessStartInfo () {
+					UseShellExecute = false,
+					RedirectStandardOutput = true,
+					RedirectStandardError = true,
+				};
+				if (Environment.OSVersion.Platform == PlatformID.Win32NT) {
+					pinfo.FileName = compiler;
+					pinfo.Arguments = sb.ToString ();
+				} else {
+					pinfo.FileName = "mono"; // SYSMONO
+					pinfo.Arguments = compiler + sb;
+				}
+				var results = new StringBuilder ();
+				var proc = new Process ();
+				proc.ErrorDataReceived += (o, e) => 
+					results.Append (e.Data).Append (Environment.NewLine);
+				proc.OutputDataReceived += (o, e) => 
+					results.Append (e.Data).Append (Environment.NewLine);
+				proc.StartInfo = pinfo;
+				proc.Start ();
+				proc.BeginOutputReadLine ();
+				proc.BeginErrorReadLine ();
+				proc.WaitForExit ();
+				output = results.ToString ();
+				hasErrors = proc.ExitCode != 0;
+				return hasErrors ? null : Assembly.ReflectionOnlyLoadFrom (Path.GetFullPath (assemblyFileName));
+			}
 			using (var codeProvider = GetCodeDomProvider ()) {
 				CompilerResults results = codeProvider.CompileAssemblyFromFile (parameters, sourceFiles.ToArray ());
 

tools/generator/Tests/generator-Tests.csproj

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="..\..\..\packages\xamarin.android.csc.dim.0.1.2\build\xamarin.android.csc.dim.props" Condition="Exists('..\..\..\packages\xamarin.android.csc.dim.0.1.2\build\xamarin.android.csc.dim.props')" />
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
@@ -210,4 +211,5 @@
   <ItemGroup>
     <Folder Include="expected.ji\DefaultInterfaceMethods\" />
   </ItemGroup>
+  <Import Project="..\..\..\packages\xamarin.android.csc.dim.0.1.2\build\xamarin.android.csc.dim.targets" Condition="Exists('..\..\..\packages\xamarin.android.csc.dim.0.1.2\build\xamarin.android.csc.dim.targets')" />
 </Project>

tools/generator/Tests/packages.config

@@ -3,4 +3,5 @@
   <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="1.0.7" targetFramework="net45" />
   <package id="Microsoft.Net.Compilers" version="2.1.0" developmentDependency="true" />
   <package id="NUnit" version="3.7.1" targetFramework="net45" />
+  <package id="xamarin.android.csc.dim" version="0.1.2" targetFramework="net45" />
 </packages>