DotNet Core 3, XUnit, Integrated Tests With Coverage

ProjectName.csproj

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    
    <!-- Add to be able to test default assembly -->
    <GenerateProgramFile>false</GenerateProgramFile>
    <TargetFramework>netcoreapp3.0</TargetFramework>
    <RootNamespace>ProjectName</RootNamespace>

    <!-- Needed to exclude *.Test.cs from Release Build -->
    <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="coverlet.msbuild" Version="2.7.0">
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
      <PrivateAssets>all</PrivateAssets>
    </PackageReference>
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.4.0" />
    <PackageReference Include="xunit" Version="2.4.1" />
    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1">
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
      <PrivateAssets>all</PrivateAssets>
    </PackageReference>
  </ItemGroup>

  <!-- Needed Non-Release Build, include *.Test.cs -->
  <ItemGroup Condition="'$(Configuration)' != 'Release'">
    <Compile Include="**/*.cs" />
  </ItemGroup>

  <!-- Needed Release Build, exclude *.Test.cs -->
  <ItemGroup Condition="'$(Configuration)' == 'Release'">
    <Compile Include="**/*.cs" Exclude="**/*.Test.cs" />
  </ItemGroup>
</Project>