test that Nox projects dependencies are healthy

src/Nox.Generator.sln

@@ -57,6 +57,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Nox.EntityFramework.Sqlite"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Generator", "Generator", "{154B838E-65DE-479F-80B7-D48CF9862306}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Nox.Tests", "..\tests\Nox.Tests\Nox.Tests.csproj", "{749A8B24-397E-4794-B647-3557E19FBA41}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -135,6 +137,10 @@ Global
 		{049C94B7-EC09-4511-B6BC-21DE2C9C54E1}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{049C94B7-EC09-4511-B6BC-21DE2C9C54E1}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{049C94B7-EC09-4511-B6BC-21DE2C9C54E1}.Release|Any CPU.Build.0 = Release|Any CPU
+		{749A8B24-397E-4794-B647-3557E19FBA41}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{749A8B24-397E-4794-B647-3557E19FBA41}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{749A8B24-397E-4794-B647-3557E19FBA41}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{749A8B24-397E-4794-B647-3557E19FBA41}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

tests/Nox.Tests/CodeAnalysisSolutionFixture.cs

@@ -0,0 +1,53 @@
+using System.Reflection;
+using Microsoft.Build.Locator;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.MSBuild;
+
+namespace Nox.Tests;
+
+public class CodeAnalysisSolutionFixture : IAsyncLifetime
+{
+    private const string SolutionPath = "src/Nox.Generator.sln";
+
+    public Solution Solution { get; private set; } = null!;
+    public Project NoxTypesProject { get; private set; } = null!;
+    public Project NoxSolutionNet7 { get; private set; } = null!;
+    public Project NoxSolutionNetStd20 { get; private set; } = null!;
+
+    public async Task InitializeAsync()
+    {
+        MSBuildLocator.RegisterDefaults();
+
+        var workspace = MSBuildWorkspace.Create();
+
+        Solution = await workspace.OpenSolutionAsync(GetSolutionFile());
+
+        NoxTypesProject = Solution.Projects.Single(project => project.Name == "Nox.Types");
+        NoxSolutionNet7 = Solution.Projects.Single(project => project.Name == "Nox.Solution(net7.0)");
+        NoxSolutionNetStd20 = Solution.Projects.Single(project => project.Name == "Nox.Solution(netstandard2.0)");
+    }
+
+    public Task DisposeAsync()
+    {
+        return Task.CompletedTask;
+    }
+    private string GetSolutionFile()
+    {
+        return GetSolutionFile(Directory.GetParent(Assembly.GetExecutingAssembly().Location));
+    }
+
+    private string GetSolutionFile(DirectoryInfo? directoryInfo)
+    {
+        if (directoryInfo == null)
+            throw new Exception($"Could not find solution {SolutionPath}");
+
+        var filePath = Path.Combine(directoryInfo.FullName, SolutionPath);
+
+        if (File.Exists(filePath))
+        {
+            return filePath;
+        }
+
+        return GetSolutionFile(directoryInfo.Parent);
+    }
+}

tests/Nox.Tests/Nox.Tests.csproj

@@ -0,0 +1,29 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="FluentAssertions" Version="6.11.0" />
+    <PackageReference Include="Microsoft.Build.Locator" Version="1.5.5" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.6.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.Workspaces.MSBuild" Version="4.6.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
+    <PackageReference Include="xunit" Version="2.4.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="coverlet.collector" Version="3.2.0">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+
+</Project>

tests/Nox.Tests/ProjectsDependenciesTests.cs

@@ -0,0 +1,29 @@
+using FluentAssertions;
+
+namespace Nox.Tests
+{
+    public class ProjectsDependenciesTests: IClassFixture<CodeAnalysisSolutionFixture>
+    {
+        private readonly CodeAnalysisSolutionFixture _fixture;
+
+        public ProjectsDependenciesTests(CodeAnalysisSolutionFixture fixture)
+        {
+            _fixture = fixture;
+        }
+
+        [Fact]
+        public void Nox_Types_Cannot_Reference_Projects()
+        {
+            _fixture.NoxTypesProject.ProjectReferences.Should().BeEmpty();
+        }
+        [Fact]
+        public void Nox_Types__References_Nox_Types_Only()
+        {
+            _fixture.NoxSolutionNet7.ProjectReferences.Count().Should().Be(1);
+            _fixture.NoxSolutionNetStd20.ProjectReferences.Count().Should().Be(1);
+
+            (_fixture.NoxSolutionNet7.ProjectReferences.Single().ProjectId == _fixture.NoxTypesProject.Id).Should().BeTrue();
+            (_fixture.NoxSolutionNetStd20.ProjectReferences.Single().ProjectId == _fixture.NoxTypesProject.Id).Should().BeTrue();
+        }
+    }
+}

tests/Nox.Tests/Usings.cs

@@ -0,0 +1 @@
+global using Xunit;