MapperSourceGenSample/tests/MapperSourceGen.SourceGenerator.Tests/Fixture.cs

namespace MapperSourceGen.SourceGenerator.Tests;

using System.Reflection;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;

internal static class Fixture
{
    private static readonly Type[] RequiredAssemblies =
    [
        typeof(Binder),
        typeof(MapperAttribute)
    ];

    private static IEnumerable<MetadataReference> AssemblyReferencesForCodeGen =>
        AppDomain.CurrentDomain
                 .GetAssemblies()
                 .Concat(RequiredAssemblies.Select(s => s.Assembly))
                 .Distinct()
                 .Where(w => !w.IsDynamic)
                 .Select(s => MetadataReference.CreateFromFile(s.Location));

    public static Task VerifyGenerateSourcesAsync(string source, params IIncrementalGenerator[] generators)
    {
        var syntaxTree = CSharpSyntaxTree.ParseText(source, CSharpParseOptions.Default);

        var compilation = CSharpCompilation.Create(
                                                   "compilation",
                                                   [syntaxTree],
                                                   AssemblyReferencesForCodeGen,
                                                   new CSharpCompilationOptions(OutputKind.ConsoleApplication));

        var driver = CSharpGeneratorDriver.Create(generators);
        var runner = driver.RunGenerators(compilation);
        var verify = Verify(runner);

        return verify;
    }
}