Initial curated itworx-knowledge-hub source from 3b1751d0d9dee551aa6994eee0093704dc334817

tests/backend/ItWorx.KnowledgeHub.Architecture.Tests/GlobalUsings.cs

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+global using Xunit;

tests/backend/ItWorx.KnowledgeHub.Architecture.Tests/ItWorx.KnowledgeHub.Architecture.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" />
+    <PackageReference Include="xunit" />
+    <PackageReference Include="xunit.runner.visualstudio">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+  </ItemGroup>
+</Project>

tests/backend/ItWorx.KnowledgeHub.Architecture.Tests/ProjectReferenceTests.cs

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+using System.Xml.Linq;
+
+namespace ItWorx.KnowledgeHub.Architecture.Tests;
+
+public sealed class ProjectReferenceTests
+{
+    [Fact]
+    public void Domain_and_contracts_have_no_project_dependencies()
+    {
+        Assert.Empty(ReadProjectReferences("src/backend/ItWorx.KnowledgeHub.Domain/ItWorx.KnowledgeHub.Domain.csproj"));
+        Assert.Empty(ReadProjectReferences("src/backend/ItWorx.KnowledgeHub.Contracts/ItWorx.KnowledgeHub.Contracts.csproj"));
+    }
+
+    [Fact]
+    public void Application_depends_only_on_domain_and_contracts()
+    {
+        var references = ReadProjectReferences(
+            "src/backend/ItWorx.KnowledgeHub.Application/ItWorx.KnowledgeHub.Application.csproj");
+
+        Assert.Equal(
+            new[]
+            {
+                "ItWorx.KnowledgeHub.Contracts",
+                "ItWorx.KnowledgeHub.Domain"
+            },
+            references.Order(StringComparer.Ordinal));
+    }
+
+    [Fact]
+    public void Infrastructure_does_not_depend_on_api()
+    {
+        var references = ReadProjectReferences(
+            "src/backend/ItWorx.KnowledgeHub.Infrastructure/ItWorx.KnowledgeHub.Infrastructure.csproj");
+
+        Assert.DoesNotContain("ItWorx.KnowledgeHub.Api", references);
+    }
+
+    private static IReadOnlyCollection<string> ReadProjectReferences(string relativeProjectPath)
+    {
+        var repositoryRoot = FindRepositoryRoot();
+        var projectPath = Path.Combine(
+            repositoryRoot.FullName,
+            relativeProjectPath.Replace('/', Path.DirectorySeparatorChar));
+
+        var document = XDocument.Load(projectPath);
+        return document
+            .Descendants("ProjectReference")
+            .Select(element => element.Attribute("Include")?.Value)
+            .Where(value => !string.IsNullOrWhiteSpace(value))
+            .Select(value => Path.GetFileNameWithoutExtension(value!))
+            .ToArray();
+    }
+
+    private static DirectoryInfo FindRepositoryRoot()
+    {
+        DirectoryInfo? current = new DirectoryInfo(AppContext.BaseDirectory);
+
+        while (current is not null)
+        {
+            if (File.Exists(Path.Combine(current.FullName, "global.json"))
+                && (File.Exists(Path.Combine(current.FullName, "CLAUDE.md"))
+                    || File.Exists(Path.Combine(current.FullName, "PUBLIC_SOURCE_EXPORT.md"))))
+            {
+                return current;
+            }
+
+            current = current.Parent;
+        }
+
+        throw new DirectoryNotFoundException("Could not locate the repository root.");
+    }
+}