public void WhenSistemaSimularAcompra()
{
var service = new CompraService(new CompraRepository(this.MassaBuilder.Context));
var controller = new CompraController(service);
var result = controller.Simular(this.MassaBuilder.Compra);
var okResponse = result as OkObjectResult;
this.MassaBuilder.Compra = okResponse.Value as Compra;
}