Run C++ unit tests on AppVeyor

Previously, these only ran on Travis.

appveyor.yml

@@ -69,6 +69,14 @@ test_script:
           git -C sass-spec checkout -q --force ci-spec-pr-$SPEC_PR
         }
       }
+      if ($env:Compiler -eq "mingw") {
+        Write-Host "Running libsass unit tests via mingw32-make..."
+        mingw32-make -C test test
+      } else {
+        Write-Host "Running libsass unit tests via msbuild..."
+        msbuild /m:4 /p:"Configuration=$env:Config;Platform=$env:Platform" test\test_shared_ptr.vcxproj
+        msbuild /m:4 /p:"Configuration=$env:Config;Platform=$env:Platform" test\test_util_string.vcxproj
+      }
       $env:TargetPath = Join-Path $pwd.Path $env:TargetPath
       If (Test-Path "$env:TargetPath") {
         ruby sass-spec/sass-spec.rb --probe-todo --impl libsass -c $env:TargetPath -s sass-spec/spec

test/test.props

@@ -0,0 +1,35 @@
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup>
+    <ConfigurationType>Application</ConfigurationType>
+    <PlatformToolset>v120</PlatformToolset>
+    <PreferredToolArchitecture>x64</PreferredToolArchitecture>
+    <OutputPath>$(SolutionDir)\build\</OutputPath>
+    <IntermediateOutputPath>$(SolutionDir)\build\obj\$(Configuration)\$(MSBuildProjectName)\</IntermediateOutputPath>
+    <OutDir>$(OutputPath)</OutDir>
+    <UseCommonOutputDirectory>True</UseCommonOutputDirectory>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <PropertyGroup>
+    <IncludePath>../include;$(IncludePath)</IncludePath>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Targets" />
+</Project>

test/test_shared_ptr.vcxproj

@@ -0,0 +1,11 @@
+<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="test.props" />
+  <ItemGroup>
+    <ClInclude Include="../src/memory/SharedPtr.h" />
+    <ClCompile Include="../src/memory/SharedPtr.cpp" />
+    <ClCompile Include="test_shared_ptr.cpp" />
+  </ItemGroup>
+  <Target Name="AfterBuild">
+    <Exec Command="$(OutDir)\test_shared_ptr.exe"/>
+  </Target>
+</Project>

test/test_util_string.vcxproj

@@ -0,0 +1,11 @@
+<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="test.props" />
+  <ItemGroup>
+    <ClInclude Include="../src/util_string.h" />
+    <ClCompile Include="../src/util_string.cpp" />
+    <ClCompile Include="test_util_string.cpp" />
+  </ItemGroup>
+  <Target Name="AfterBuild">
+    <Exec Command="$(OutDir)\test_util_string.exe"/>
+  </Target>
+</Project>