Verify.SourceGenerators | Extends Verify to allow verification

using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Text;

[Generator]
public class HelloWorldGenerator :
    ISourceGenerator
{
    public void Execute(GeneratorExecutionContext context)
    {
        var source = @"using System;
public stati  

using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;

[UsesVerify]
public class SampleTest
{
    [Fact]
    public Task Run()
    {
        var compilation = CSharpCompilation.Create("name");
        HelloWorldGenerator generator = new(  

{
  Diagnostics: [
    {
      Id: theId,
      Title: the title,
      Severity: Info,
      WarningLevel: 1,
      Location: theFile: (1,2)-(3,4),
      Description: ,
      HelpLink: ,
      MessageFormat: the message from {0},
      Message: the