NumberSystem/TestProject/TestProject.csproj

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

  <PropertyGroup>
    <TargetFramework>net48</TargetFramework>
    <Nullable>disable</Nullable>

    <IsPackable>false</IsPackable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="EntityFramework" Version="6.4.4" />
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
    <PackageReference Include="MSTest.TestAdapter" Version="2.2.7" />
    <PackageReference Include="MSTest.TestFramework" Version="2.2.7" />
    <PackageReference Include="coverlet.collector" Version="3.1.0" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\numbersystem\numbersystem.csproj" />
  </ItemGroup>

  <ItemGroup>
    <Reference Include="PresentationCore" />
    <Reference Include="PresentationFramework" />
    <Reference Include="WindowsBase" />
  </ItemGroup>

</Project>