Inheritance: GraphQL.Types.Schema
        public GraphQLController(
            IDocumentExecuter executer,
            IDocumentWriter writer,
            StarWarsSchema schema)
        {
            _executer = executer;
            _writer = writer;
            _schema = schema;

            _namedQueries = new Dictionary<string, string>
            {
                ["a-query"] = @"query foo { hero { name } }"
            };
        }
    public async Task Synchronous_and_Async_Works_Same(IGraphQLTextSerializer serializer)
    {
        //ISSUE: manually created test instance with ServiceProvider
        var builder = new MicrosoftDI.GraphQLBuilder(new ServiceCollection(), b => new StarWarsTestBase().RegisterServices(b.Services));
        var schema  = new GraphQL.StarWars.StarWarsSchema(builder.ServiceCollection.BuildServiceProvider());
        var result  = await new DocumentExecuter().ExecuteAsync(new ExecutionOptions
        {
            Schema = schema,
            Query  = "IntrospectionQuery".ReadGraphQLRequest()
        }).ConfigureAwait(false);
        var syncResult = serializer.Serialize(result);
        var stream     = new System.IO.MemoryStream();
        await serializer.WriteAsync(stream, result).ConfigureAwait(false);

        var asyncResult = System.Text.Encoding.UTF8.GetString(stream.ToArray());

        syncResult.ShouldBe(asyncResult);
    }