public async Task concurrent_updates_throw_AggregateConcurrencyException()
{
var id = $"Persons-{Guid.NewGuid()}";
await Repository.StoreAsync(PersonAggregateFactory.Create(id, "Joe"));
var loadedAggregate = await Repository.GetAsync <PersonAggregate>(id);
await TestingUtils.UpdateOutOfSession(id, Repository);
TestingUtils.Rename(loadedAggregate, "Gary");
Assert.That(async() => await Repository.StoreAsync(loadedAggregate), Throws.Exception.TypeOf <AggregateConcurrencyException>());
}