public void ApplyEvent_WhenEventIsNotRegisteredWithAggregate_Throws()
{
var aggregate = new TestAggregate(Guid.NewGuid());
var exception = Assert.Throws <EventHandlerNotFoundException>(
() => aggregate.RaiseUnregisteredEvent());
exception.AggregateType.Should().Be(typeof(TestAggregate));
_output.WriteLine(exception.Message);
}