# 4.2 Packages

The context uses Entity Framework Core's Postgres provider directly now, so the application names
it rather than relying on Trax to bring it. The tests add Trax's data-layer guards.

```xml file=Directory.Packages.props
<Project>
  <PropertyGroup>
    <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
    <CentralPackageTransitivePinningEnabled>true</CentralPackageTransitivePinningEnabled>
  </PropertyGroup>

  <ItemGroup>
    <PackageVersion Include="Trax.Core" Version="1.68.0" />
    <PackageVersion Include="Trax.Core.Testing" Version="1.68.0" />
    <PackageVersion Include="Trax.Effect" Version="1.68.0" />
    <PackageVersion Include="Trax.Effect.Data.InMemory" Version="1.68.0" />
    <PackageVersion Include="Trax.Effect.Data.Postgres" Version="1.68.0" />
    <PackageVersion Include="Trax.Effect.Data.Testing" Version="1.68.0" />
    <PackageVersion Include="Trax.Effect.JunctionProvider.Logging" Version="1.68.0" />
    <PackageVersion Include="Trax.Effect.Provider.Parameter" Version="1.68.0" />
    <PackageVersion Include="Trax.Mediator" Version="1.68.0" />
    <PackageVersion Include="Trax.Mediator.Testing" Version="1.68.0" />
  </ItemGroup>

  <ItemGroup>
    <PackageVersion Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="10.0.3" />
  </ItemGroup>

  <ItemGroup>
    <PackageVersion Include="AwesomeAssertions" Version="9.6.0" />
    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.12" />
    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.10.1" />
    <!-- NUnit3TestAdapter pulls these at versions deprecated as Legacy; pin newer ones. -->
    <PackageVersion Include="Microsoft.Testing.Extensions.VSTestBridge" Version="2.5.1" />
    <PackageVersion Include="Microsoft.Testing.Platform.MSBuild" Version="2.5.1" />
    <PackageVersion Include="NUnit" Version="5.0.0" />
    <PackageVersion Include="NUnit.Analyzers" Version="4.15.0" />
    <PackageVersion Include="NUnit3TestAdapter" Version="6.3.0" />
  </ItemGroup>
</Project>
```

```xml file=Shopfront.csproj
<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>net10.0</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <!-- The tests live under tests/, in a project of their own. -->
    <DefaultItemExcludes>$(DefaultItemExcludes);tests/**</DefaultItemExcludes>
  </PropertyGroup>

  <ItemGroup>
    <!-- The junctions are internal; their tests are the one project that may see them. -->
    <InternalsVisibleTo Include="Shopfront.Tests" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" />
    <PackageReference Include="Trax.Core" />
    <PackageReference Include="Trax.Effect" />
    <PackageReference Include="Trax.Effect.Data.Postgres" />
    <PackageReference Include="Trax.Effect.JunctionProvider.Logging" />
    <PackageReference Include="Trax.Effect.Provider.Parameter" />
    <PackageReference Include="Trax.Mediator" />
  </ItemGroup>
</Project>
```

```xml file=tests/Shopfront.Tests/Shopfront.Tests.csproj
<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net10.0</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <IsPackable>false</IsPackable>
    <IsTestProject>true</IsTestProject>
  </PropertyGroup>

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

  <ItemGroup>
    <PackageReference Include="AwesomeAssertions" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" />
    <PackageReference Include="Microsoft.NET.Test.Sdk" />
    <PackageReference Include="NUnit" />
    <PackageReference Include="NUnit.Analyzers" />
    <PackageReference Include="NUnit3TestAdapter" />
    <PackageReference Include="Trax.Core.Testing" />
    <PackageReference Include="Trax.Effect.Data.InMemory" />
    <PackageReference Include="Trax.Effect.Data.Testing" />
    <PackageReference Include="Trax.Mediator.Testing" />
  </ItemGroup>
</Project>
```

## SDK Reference

> [DomainDataContext](/docs/sdk-reference/configuration/domain-data-context) | [EnsureSchemaCreatedAsync](/docs/effect/domain-schema-bootstrap) | [Add a domain data context](/docs/effect/effect-providers/domain-data-contexts) | [IFailureClassifier](/docs/sdk-reference/configuration/i-failure-classifier) | [Architecture guards](/docs/reference/architecture-guards)

---

Next: [4.3 The models](/docs/book/the-shops-own-data/the-models)