SourceGen started

Assets/SourceGeneration/InfraGens~/InfraGens/InfraGens.Tests/SampleSourceGeneratorTests.cs

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+using System.IO;
+using System.Linq;
+using InfraGens.Tests.Utils;
+using Microsoft.CodeAnalysis.CSharp;
+using Xunit;
+
+namespace InfraGens.Tests;
+
+public class SampleSourceGeneratorTests
+{
+    private const string DddRegistryText = @"User
+Document
+Customer";
+
+    [Fact]
+    public void GenerateClassesBasedOnDDDRegistry()
+    {
+        // Create an instance of the source generator.
+        var generator = new SampleSourceGenerator();
+
+        // Source generators should be tested using 'GeneratorDriver'.
+        var driver = CSharpGeneratorDriver.Create(new[] { generator },
+            new[]
+            {
+                // Add the additional file separately from the compilation.
+                new TestAdditionalFile("./DDD.UbiquitousLanguageRegistry.txt", DddRegistryText)
+            });
+
+        // To run generators, we can use an empty compilation.
+        var compilation = CSharpCompilation.Create(nameof(SampleSourceGeneratorTests));
+
+        // Run generators. Don't forget to use the new compilation rather than the previous one.
+        driver.RunGeneratorsAndUpdateCompilation(compilation, out var newCompilation, out _);
+
+        // Retrieve all files in the compilation.
+        var generatedFiles = newCompilation.SyntaxTrees
+            .Select(t => Path.GetFileName(t.FilePath))
+            .ToArray();
+
+        // In this case, it is enough to check the file name.
+        Assert.Equivalent(new[]
+        {
+            "User.g.cs",
+            "Document.g.cs",
+            "Customer.g.cs"
+        }, generatedFiles);
+    }
+}