UPDATE: Now part of the powerpack. Get the latest version https://github.com/JetBrains/meta-runner-power-pack/tree/master/xUnit.net-dotCover. Provides dotCover functionality for your xunit tests in TeamCity. Supports local or remote nuget feeds, different runners per teamcity buildconfig, supports .net legacy activation, xunit traits and custom …

teamcity_xunit_dotcover_metarunner.xml

<?xml version="1.0" encoding="UTF-8"?>
<meta-runner name="xUnit.net + dotCover 💕">
  <description>Run xUnit.net tests with dotCover coverage: http://www.wwwlicious.com/2015/09/25/teamcity-dotcover-xunit-at-last/</description>
  <settings>
    <parameters>
      <param name="xUnitNet.nugetSource" value="http://www.nuget.org/api/v2/" spec="text description='The nuget source url for the xunit runner' display='normal' label='Xunit Runner Nuget Source'" />
      <param name="xUnitNet.executable" value="xunit.console.exe" spec="text description='The xunit runner executable to use in the nuget package' display='normal' label='Xunit Runner Executable'" />
      <param name="xUnitNet.executable.args" value="" spec="text description='Custom xunit runner arguments' display='normal' label='Xunit Runner Executable additional arguments'" />
      <param name="xUnitNet.executable.legacymode" value="false" spec="checkbox checkedValue='true' description='For mixed mode assemblies, enables xunit runner to use legacy activiation' uncheckedValue='false' label='Enable .Net V2 Legacy Activation' display='normal'" />
      <param name="xUnitNet.assembliesPath" value="*/bin/*tests.dll" spec="text description='The assemblies to test; relative to the working directory. Asterix wildcard (*) is supported here' display='normal' label='Assemblies to test:'" />
      <param name="xUnitNet.trait" value="" spec="text description='only run tests with matching name/value traits, one name=value per line (e.x. name=value)' validationMode='any' label='Include Traits' display='normal'" />
      <param name="xUnitNet.notrait" value="Category=Integration" spec="text description='do not run tests with matching name/value traits, one name=value per line (e.x. name=value)' validationMode='any' label='Exclude Traits' display='normal'" />
      <param name="xUnitNet.dotCover.Filters" spec="text description='Specifies coverage filters using the config format. Documentation http://www.jetbrains.com/dotcover/help/dotCover__Console_Runner_Commands.html' label='dotCover Filters' validationMode='any' display='normal'"><![CDATA[<!-- Coverage filters. It's possible to use asterisks as wildcard symbols. -->
<Filters>
  <IncludeFilters>
    <FilterEntry>
      <ModuleMask>*</ModuleMask>
      <ClassMask>*</ClassMask>
      <FunctionMask>*</FunctionMask>
    </FilterEntry>
  </IncludeFilters>
  <ExcludeFilters>
    <FilterEntry>
      <ModuleMask>*Tests</ModuleMask>
    </FilterEntry>
  </ExcludeFilters>
</Filters>]]></param>
      <param name="xUnitNet.dotCover.AttributeFilters" spec="text description='Specifies attribute filters using the config format. Documentation http://www.jetbrains.com/dotcover/help/dotCover__Console_Runner_Commands.html' validationMode='any' label='dotCover AttributeFilters' display='normal'"><![CDATA[<!-- Attribute filters. It's possible to use asterisks as wildcard symbols. -->
<AttributeFilters>
  <AttributeFilterEntry>System.CodeDom.Compiler.GeneratedCodeAttribute</AttributeFilterEntry>
  <AttributeFilterEntry>System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverageAttribute</AttributeFilterEntry>
  <AttributeFilterEntry>System.ObsoleteAttribute</AttributeFilterEntry>
</AttributeFilters>]]></param>
    </parameters>
    <build-runners>
      <runner name="Install Test runner, Create config, Run tests, Update coverage" type="jetbrains_powershell">
        <parameters>
          <param name="jetbrains_powershell_execution" value="PS1" />
          <param name="jetbrains_powershell_noprofile" value="true" />
          <param name="jetbrains_powershell_errorToError" value="error" />
          <param name="jetbrains_powershell_script_mode" value="CODE" />
          <param name="jetbrains_powershell_bitness" value="x86" />
          <param name="teamcity.step.mode" value="default" />
          <param name="jetbrains_powershell_script_code"><![CDATA[[CmdletBinding()]
Param (
    [string] $workingDir = "%teamcity.build.workingDir%",
    [string] $nugetExe = "%teamcity.tool.NuGet.CommandLine.DEFAULT.nupkg%\tools\nuget.exe",
    [string] $xUnitNuget = "%xUnitNet.nugetSource%",
    [string] $xUnitExe = "%xUnitNet.executable%",
    [string] $dotCoverExecutable = "%teamcity.tool.dotCover%",
    [boolean] $xunitLegacy = [boolean]"%xUnitNet.executable.legacymode%",
    [string] $assemblyFilter = "%xUnitNet.assembliesPath%",
    [string] $traits = "%xUnitNet.trait%",
    [string] $notraits = "%xUnitNet.notrait%",
    [string] $dotCoverFilter = "%xUnitNet.dotCover.Filters%",
    [string] $dotCoverAttributeFilter = "%xUnitNet.dotCover.AttributeFilters%",
    [string] $xunitArgs = "%xUnitNet.executable.args%"
)

$ErrorActionPreference = "Stop"

try {

	## get xunit runner from nuget package feed
	iex "$nugetExe install xunit.runner.console -source $xUnitNuget"
	$xunit = Join-Path $workingDir "xunit.runner.console.*\tools\$xUnitExe" | Resolve-Path
	
  ## modify runner config if legacy v2 runtime activation mode required
	If($xunitLegacy) {
		$config = [string]$xunit + ".config"
		$doc = (Get-Content $config) -as [Xml]
		$doc.configuration.startup.SetAttribute("useLegacyV2RuntimeActivationPolicy", "true")
		$doc.Save($config)
  }
	
  ## Search for the assemblies using wildcard pattern
  $assemblies = (Get-ChildItem $assemblyFilter -Recurse | select -ExpandProperty FullName)
  Write-Host "Found test assemblies: " $assemblies
  
  ## create single-line correctly formatted xunit argument 
  # split multi-line xunit args into single line and correctly format
  $assemblyArg = $assemblies.Trim() -Join " "
  If($traits.Length -gt 0) {
    $traitArg = ($traits.Trim().Split("`r`n") | where {$_ -ne ""} | % { "-trait """+$_+""""}) -join " "
  }
  If($notraits.Length -gt 0) {  
    $notraitArg = ($notraits.Trim().Split("`r`n") | where {$_ -ne ""} | % { "-notrait """+$_+""""}) -join " "
  }
  $xunitArg = $assemblyArg, $traitArg, $notraitArg, $xunitArgs -join " "
  
  ## filenames
  $outputFile = "xunitcoverage.dcvr"
  $settingsFileName = "coverage_settings.xml"
  $coverageLogFileName = "dotCoverXunitLog.txt"
  
  ## genrate coverage settings file
  $settingsXml = @"
<?xml version="1.0" encoding="utf-8"?>
<CoverageParams>
  <TargetExecutable>$xunit</TargetExecutable>
  <TargetArguments>$xunitArg</TargetArguments>
  <TargetWorkingDir>$workingDir</TargetWorkingDir>
  <Output>$outputFile</Output>
  $dotCoverFilter
  $dotCoverAttributeFilter
</CoverageParams>
"@
  # Avoid BOM http://stackoverflow.com/questions/5596982/using-powershell-to-write-a-file-in-utf-8-without-the-bom
  $settingsXml | Out-File $settingsFileName -Encoding ASCII
  
  ## Run coverage
  $dotCover = Join-Path $dotCoverExecutable "dotCover.exe"
  $dotCoverArgs = " cover " + $settingsFileName + " /LogFile=$coverageLogFileName /ReturnTargetExitCode"
  Write-Host "##teamcity[message text='dotCoverExecutable: $dotCoverExecutable']"
  Write-Host "##teamcity[message text='dotCoverArgs: $dotCoverArgs']"
  $command = $dotCover + $dotCoverArgs
  iex $command
  
  ## Report coverage results and output build artifacts
  write-host "##teamcity[importData type='dotNetCoverage' tool='dotcover' path='$outputFile']"
  write-host "##teamcity[publishArtifacts '$settingsFileName']"
  write-host "##teamcity[publishArtifacts '$coverageLogFileName']"
  write-host "##teamcity[publishArtifacts '$outputFile']"
    
}
catch {
  
    Write-Host "##teamcity[buildStatus text='$_' status='FAILURE']"
    Write-Host "##teamcity[message text='$_' status='ERROR']"
    exit 1
}]]></param>
        </parameters>
      </runner>
    </build-runners>
    <requirements />
  </settings>
</meta-runner>