MyProject.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup Label="Configuration" Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|netcoreapp1.1|AnyCPU'">
    <OutputType>exe</OutputType>
  </PropertyGroup>

  <PropertyGroup>
    <TargetFrameworks>netcoreapp1.1;net461</TargetFrameworks>
    <AssemblyName>MyProject.UnitTests</AssemblyName>
    <ApplicationIcon />
    <OutputTypeEx>exe</OutputTypeEx>
    <StartupObject />
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />
    <PackageReference Include="xunit" Version="2.2.0" />
    <PackageReference Include="xunit.runner.visualstudio" Version="2.2.0" />
  </ItemGroup>

  <ItemGroup Condition=" '$(TargetFramework)' == 'net461' ">
    <Reference Include="System" />
    <Reference Include="Microsoft.CSharp" />
  </ItemGroup>

  <ItemGroup>
    <Service Include="{82a7f48d-3b50-4b1e-b82e-3ada8210c358}" />
  </ItemGroup>

</Project>