Run coverage analysis from MSBuild

Coverage.targets

<?xml version="1.0" encoding="utf-8"?>
<Project
  DefaultTargets="Report"
	ToolsVersion="4.0"
	xmlns="http://schemas.microsoft.com/developer/msbuild/2003">

	<PropertyGroup>

		<!-- versions of the required tools. ADJUST TO ACTUAL VERSION NUMBERS! -->
		<xUnitVersion>1.9.2</xUnitVersion>
		<OpenCoverVersion>4.5.1923</OpenCoverVersion>
		<ReportGeneratorVersion>1.9.0.0</ReportGeneratorVersion>

		<!-- locations of required tools -->
		<nuGetDir>..\packages\</nuGetDir>
		<xUnitRunnerDir>$(nuGetDir)xunit.runners.$(xUnitVersion)\tools\</xUnitRunnerDir>
		<xUnitRunnerName>xunit.console.clr4.x86.exe</xUnitRunnerName>
		<xUnitRunner>$(xUnitRunnerDir)$(xUnitRunnerName)</xUnitRunner>

		<OpenCoverDir>$(nuGetDir)OpenCover.$(OpenCoverVersion)\</OpenCoverDir>

		<ReportGeneratorDir>$(nuGetDir)ReportGenerator.$(ReportGeneratorVersion)\</ReportGeneratorDir>
		<ReportGenerator>$(ReportGeneratorDir)ReportGenerator.exe</ReportGenerator>

		<!-- property required by the Opencover.targets file. Note that
		     the path is *relative* to said file!-->
		<OpenCoverMSBuildTasksPath>.\</OpenCoverMSBuildTasksPath>

		<!-- Filters to be applied when creating the coverage report.
		     ADJUST TO YOUR NAMESPACE/ASSEMBLY NAMES! -->
		<CoverageFilters>+[*]FOO.*;-[*]FOO.**.Annotations.*;
			-[*.Test]*</CoverageFilters>

		<!-- Output directory for the coverage information.
		     DANGER: The "Clean" target deletes this directory! -->
		<ReportsPath>report\</ReportsPath>

		<!-- Build configuration defaults-->
		<Configuration
			Condition=" '$(Configuration)' == '' ">Debug</Configuration>
		<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
	</PropertyGroup>

	<!-- Build configuration dependent properties -->
	<PropertyGroup
		Condition=" '$(OutputPath)' == '' And '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
		<Optimize>false</Optimize>
		<OutputPath>bin\Debug\</OutputPath>
	</PropertyGroup>
	<PropertyGroup
		Condition=" '$(OutputPath)' == '' And '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
		<Optimize>true</Optimize>
		<OutputPath>bin\Release\</OutputPath>
	</PropertyGroup>

	<!-- Get the definition of the OpenCover task -->
	<Import Project="$(OpenCoverDir)MSBuild\Opencover.targets"/>

	<ItemGroup>
		<!-- Test projects -->
		<TestProjects Include="..\*.Test\*.Test.*proj" />
	</ItemGroup>

	<!-- First build the tests -->
	<Target Name="BuildTests" Outputs="@(TestProjectOutput)">
		<MSBuild
			Projects="@(TestProjects)"
			Targets="Build"
			Properties="Configuration=$(Configuration);Optimize=$(Optimize)">
			<Output
				ItemName="TestProjectOutputs"
				TaskParameter="TargetOutputs"/>
		</MSBuild>
	</Target>

	<!-- Then run them using the coverage tool, batch on target -->
	<Target
		Name="Coverage" DependsOnTargets="_ComputeCoverageOutput"
		Inputs="%(CoverageOutputs.Input)"
		Outputs="%(CoverageOutputs.Identity)">
		<MakeDir Directories="$(ReportsPath)"/>
		<OpenCover
			Target="$(xUnitRunner)"
			Output="%(CoverageOutputs.Identity)"
			TargetArgs="%(CoverageOutputs.Input) /noshadow"
			Filter="$(CoverageFilters)"
			ToolPath="$(OpenCoverDir)"
			/>
	</Target>
	<Target Name="_ComputeCoverageOutput" DependsOnTargets="BuildTests">
		<ItemGroup>
			<CoverageOutputs
				Include="$(ReportsPath)%(TestProjectOutputs.Filename).opencover">
				<!-- Add the assembly as "Input" meta-data -->
				<Input>%(TestProjectOutputs.Identity)</Input>
			</CoverageOutputs>
		</ItemGroup>
	</Target>

	<!-- Finally generate the report -->
	<ItemGroup>
		<ReportOutput Include="$(ReportsPath)index.htm"/>
	</ItemGroup>
	<Target Name="Report"
		Inputs="@(CoverageOutputs)"
		DependsOnTargets="Coverage"
		Outputs="@(ReportOutput)">
		<Exec Command='$(ReportGenerator) "-reports:@(CoverageOutputs)" "-targetdir:$(ReportsPath)"' />
	</Target>

	<!-- And optionally show it -->
	<Target Name="See" DependsOnTargets="Report">
		<Exec Command="start %(ReportOutput.Identity)" />
	</Target>
</Project>