C# Add test suite for Diagnostic Analyzers: GlobalClass and MustBeVariant

modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Tests/CSharpAnalyzerVerifier.cs

@@ -0,0 +1,56 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp.Testing;
+using Microsoft.CodeAnalysis.Diagnostics;
+using Microsoft.CodeAnalysis.Testing;
+using Microsoft.CodeAnalysis.Testing.Verifiers;
+using Microsoft.CodeAnalysis.Text;
+
+namespace Godot.SourceGenerators.Tests;
+
+public static class CSharpAnalyzerVerifier<TAnalyzer>
+where TAnalyzer : DiagnosticAnalyzer, new()
+{
+    public class Test : CSharpAnalyzerTest<TAnalyzer, XUnitVerifier>
+    {
+        public Test()
+        {
+            ReferenceAssemblies = ReferenceAssemblies.Net.Net60;
+
+            SolutionTransforms.Add((Solution solution, ProjectId projectId) =>
+            {
+                Project project =
+                    solution.GetProject(projectId)!.AddMetadataReference(Constants.GodotSharpAssembly
+                        .CreateMetadataReference());
+
+                return project.Solution;
+            });
+        }
+    }
+
+    public static Task Verify(string sources, params DiagnosticResult[] expected)
+    {
+        return MakeVerifier(new string[] { sources }, expected).RunAsync();
+    }
+
+    public static Test MakeVerifier(ICollection<string> sources, params DiagnosticResult[] expected)
+    {
+        var verifier = new Test();
+
+        verifier.TestState.AnalyzerConfigFiles.Add(("/.globalconfig", $"""
+        is_global = true
+        build_property.GodotProjectDir = {Constants.ExecutingAssemblyPath}
+        """));
+
+        verifier.TestState.Sources.AddRange(sources.Select(source =>
+        {
+            return (source, SourceText.From(File.ReadAllText(Path.Combine(Constants.SourceFolderPath, source))));
+        }));
+
+        verifier.ExpectedDiagnostics.AddRange(expected);
+        return verifier;
+    }
+}