public void Should_throw_if_more_handlers()
{
var x = new TestAggregateDoSomethingHandler();
_bus.RegisterHandler<TestAggregateDoSomething>(x.Handle);
_bus.RegisterHandler<TestAggregateDoSomething>(x.Handle);
Assert.Throws<InvalidOperationException>(() => _bus.Send(new TestAggregateDoSomething()));
}