Start by restoring the nuget packages and building the solution.

Coverage is generated using OpenCover. You can obtain it from NuGet or Chocolatey. If we run the following command in PowerShell to install OpenCover via Chocolatey,

choco install opencover.portable

the OpenCover commandline will become available.

First install the xUnit console runner via Nuget or Chocolatey. If we run the following in PowerShell to install xUnit via Chocolatey

choco install xunit

and execute the following in your solution's root,

OpenCover.Console.exe -register:user -target:"xunit.console.x86.exe" -targetargs:".\MyUnitTests\bin\Debug\MyUnitTests.dll -noshadow" -filter:"+[UnitTestTargetProject*]* -[MyUnitTests*]*" -output:".\MyProject_coverage.xml"

Then a coverage report will be generated.

Execute the following in your solution's root,

OpenCover.Console.exe -register:user -target:"C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\MSTest.exe" -targetargs:"/testcontainer:"".\MyUnitTests\bin\Debug\MyUnitTests.dll" -filter:"+[UnitTestTargetProject*]* -[MyUnitTests*]*" -output:".\MyProject_coverage.xml"

where you may need to change the -target flag to point to the correct version of MSTest.

Many options exit for uploading reports to Codecov. Three commonly used uploaders for .NET are

1. Codecov-exe (C# source code)
2. Bash
3. Python

For OS X and Linux builds, the recommended uploader is bash. For windows builds, all three uploaders work, but Codecov-exe does not require any dependencies. For example, the bash uploader and python uploader would require bash or python to be installed. This may or may not be an option.

First install Codecov-exe via Nuget or Chocolatey. If we run the following in PowerShell to install it via Chocolatey

choco install codecov

and then run the following in PowerShell

.\codecov -f "MyProject_coverage.xml" -t <your upload token>

the report will be uploaded.

In bash run the following to upload the report

curl -s https://codecov.io/bash > codecov
chmod +x codecov
./codecov -f "MyProject_coverage.xml" -t <your upload token>

First installed python (if you don't have it already). A simple way to install python is Chocolatey

choco install python

Next run the following in PowerShell

pip install codecov
.\codecov -f "MyProject_coverage.xml" -t <your upload token>

The previous examples assumed local development. More commonly, you'll use a CI service like AppVeyor or TeamCity. For TeamCity builds please see the documentation. For AppVeyor builds using xUnit, your yaml file would look something like

image: Visual Studio 2015

before_build:
- nuget restore
- choco install opencover.portable
- choco install codecov

build:
  project: CodecovProject.sln
  verbosity: minimal

test_script:
- OpenCover.Console.exe -register:user -target:"%xunit20%\xunit.console.x86.exe" -targetargs:".\MyUnitTests\bin\Debug\MyUnitTests.dll -noshadow" -filter:"+[UnitTestTargetProject*]* -[MyUnitTests*]*" -output:".\MyProject_coverage.xml"
- codecov -f "MyProject_coverage.xml"

Using this method you can cache your packages.config file.

image: Visual Studio 2015

before_build:
- nuget restore

build:
  project: CodecovProject.sln
  verbosity: minimal

test_script:
- .\packages\<ADD PATH>\OpenCover.Console.exe -register:user -target:"%xunit20%\xunit.console.x86.exe" -targetargs:".\MyUnitTests\bin\Debug\MyUnitTests.dll -noshadow" -filter:"+[UnitTestTargetProject*]* -[MyUnitTests*]*" -output:".\MyProject_coverage.xml"
- .\packages\<ADD PATH>\codecov.exe -f "MyProject_coverage.xml"

image: Visual Studio 2015

before_build:
- nuget restore
- choco install opencover.portable

build:
  project: CodecovProject.sln
  verbosity: minimal

test_script:
- OpenCover.Console.exe -register:user -target:"%xunit20%\xunit.console.x86.exe" -targetargs:".\MyUnitTests\bin\Debug\MyUnitTests.dll -noshadow" -filter:"+[UnitTestTargetProject*]* -[MyUnitTests*]*" -output:".\MyProject_coverage.xml"
- "SET PATH=C:\\Python34;C:\\Python34\\Scripts;%PATH%"
- pip install codecov
- codecov -f "MyProject_coverage.xml"

If you use Cake (C# Make) for your build automation, there is a Cake.Codecov addin available. Cake also has built in support for OpenCover. It makes using OpenCover and Codecov-exe really easy!

An example C# project using AppVeyor, xUnit, OpenCover, and Codecov-exe is DotNetAnalyzers/StyleCopAnalyzers.