public void When_a_command_reserves_a_unique_value_then_a_subsequent_request_by_a_different_owner_fails()
{
// arrange
var username = Any.CamelCaseName(5);
// act
var account1 = new CustomerAccount();
account1.Apply(new RequestUserName
{
UserName = username,
Principal = new Customer
{
Name = Any.CamelCaseName()
}
});
account1.ConfirmSave();
var account2 = new CustomerAccount();
var secondPrincipal = new Customer
{
Name = Any.CamelCaseName()
};
var secondAttempt = account2.Validate(new RequestUserName
{
UserName = username,
Principal = secondPrincipal
});
// assert
secondAttempt.ShouldBeInvalid($"The user name {username} is taken. Please choose another.");
}
public void Reserving_a_unique_value_can_happen_during_command_validation()
{
// arrange
var name = Any.CamelCaseName();
var firstCall = true;
Configuration.Current.ReservationService = new FakeReservationService((value, scope, actor) =>
{
if (firstCall)
{
firstCall = false;
return(true);
}
return(false);
});
// act
var account1 = new CustomerAccount();
account1.Apply(new RequestUserName
{
UserName = name
});
account1.ConfirmSave();
var account2 = new CustomerAccount();
var secondAttempt = account2.Validate(new RequestUserName
{
UserName = name
});
// assert
secondAttempt.ShouldBeInvalid(string.Format("The user name {0} is taken. Please choose another.", name));
}
public void When_a_command_reserves_a_unique_value_then_a_subsequent_request_by_the_same_owner_succeeds()
{
// arrange
var username = Any.CamelCaseName(5);
// act
var account1 = new CustomerAccount();
var principal = new Customer
{
Name = Any.CamelCaseName()
};
account1.Apply(new RequestUserName
{
UserName = username,
Principal = principal
});
account1.ConfirmSave();
var account2 = new CustomerAccount();
var secondAttempt = account2.Validate(new RequestUserName
{
UserName = username,
Principal = principal
});
// assert
secondAttempt.ShouldBeValid();
}
public void Reserving_a_unique_value_can_happen_during_command_validation()
{
// arrange
var name = Any.CamelCaseName();
var firstCall = true;
Configuration.Current.ReservationService = new FakeReservationService((value, scope, actor) =>
{
if (firstCall)
{
firstCall = false;
return true;
}
return false;
});
// act
var account1 = new CustomerAccount();
account1.Apply(new RequestUserName
{
UserName = name
});
account1.ConfirmSave();
var account2 = new CustomerAccount();
var secondAttempt = account2.Validate(new RequestUserName
{
UserName = name
});
// assert
secondAttempt.ShouldBeInvalid(string.Format("The user name {0} is taken. Please choose another.", name));
}
public void When_instantiated_from_a_snapshot_the_aggregate_version_is_correct()
{
// arrange
var customerAccount = new CustomerAccount()
.Apply(new ChangeEmailAddress(Any.Email()));
customerAccount.ConfirmSave();
var snapshot = customerAccount.CreateSnapshot();
snapshot.Version = 12;
// act
var accountFromSnapshot = new CustomerAccount(snapshot);
// assert
accountFromSnapshot.Version.Should().Be(12);
}
public async Task ETags_are_saved_in_the_snapshot()
{
var etag = Any.Guid().ToString();
var account = new CustomerAccount().Apply(new RequestSpam
{
ETag = etag
});
account.ConfirmSave();
var repository = new InMemorySnapshotRepository();
await repository.SaveSnapshot(account);
var snapshot = await repository.GetSnapshot(account.Id);
snapshot.ETags
.Should()
.Contain(etag);
}
public async Task ETags_are_saved_in_the_snapshot()
{
var etag = Any.Guid().ToString();
var account = new CustomerAccount().Apply(new RequestSpam
{
ETag = etag
});
account.ConfirmSave();
var repository = new InMemorySnapshotRepository();
await repository.SaveSnapshot(account);
var snapshot = await repository.GetSnapshot(account.Id);
snapshot.ETags
.Should()
.Contain(etag);
}
public void EventSourcedAggregate_can_be_rehydrated_from_an_empty_event_sequence_when_using_a_snapshot()
{
// arrange
var emailAddress = Any.Email();
var customerAccount = new CustomerAccount()
.Apply(new ChangeEmailAddress(emailAddress));
customerAccount.ConfirmSave();
var snapshot = customerAccount.CreateSnapshot();
//act
var fromSnapshot = new CustomerAccount(snapshot);
// assert
fromSnapshot.EmailAddress
.Should()
.Be(emailAddress);
}
public void An_aggregate_instantiated_from_a_snapshot_adds_new_events_at_the_correct_sequence_number()
{
// arrange
var account = new CustomerAccount()
.Apply(new ChangeEmailAddress(Any.Email()));
account.ConfirmSave();
var snapshot = account.CreateSnapshot();
snapshot.Version = 12;
// act
var accountFromSnapshot = new CustomerAccount(snapshot);
accountFromSnapshot.Apply(new RequestNoSpam());
// assert
accountFromSnapshot.Version.Should().Be(13);
accountFromSnapshot.PendingEvents.Last().SequenceNumber.Should().Be(13);
}
public async Task Repeated_ETags_are_not_repeated_in_the_snapshot()
{
var account = new CustomerAccount()
.Apply(new RequestSpam
{
ETag = "a"
})
.Apply(new RequestSpam
{
ETag = "a"
});
account.ConfirmSave();
var repository = new InMemorySnapshotRepository();
await repository.SaveSnapshot(account);
var snapshot = await repository.GetSnapshot(account.Id);
snapshot.ETags
.Should()
.ContainSingle(etag => etag == "a");
}
public void Accessing_event_history_from_an_aggregate_instantiated_using_a_snapshot_throws()
{
// arrange
var account = new CustomerAccount()
.Apply(new ChangeEmailAddress(Any.Email()));
account.ConfirmSave();
var snapshot = account
.CreateSnapshot();
snapshot.Version = 10;
account = new CustomerAccount(snapshot);
// act
Action getEvents = () => account.Events();
// assert
getEvents.ShouldThrow <InvalidOperationException>()
.And
.Message
.Should()
.Contain("Aggregate was sourced from a snapshot, so event history is unavailable.");
}
public void Attempting_to_re_source_an_aggregate_that_was_instantiated_using_a_snapshot_succeeds_if_the_specified_version_is_at_or_after_the_snapshot()
{
// arrange
var originalEmail = Any.Email();
var account = new CustomerAccount()
.Apply(new ChangeEmailAddress(originalEmail));
account.ConfirmSave();
var snapshot = account.CreateSnapshot();
snapshot.Version = 10;
account = new CustomerAccount(snapshot);
account.Apply(new ChangeEmailAddress(Any.Email()));
// act
var accountAtVersion10 = account.AsOfVersion(10);
// arrange
accountAtVersion10.Version.Should().Be(10);
accountAtVersion10.EmailAddress.Should().Be(originalEmail);
}
public void Attempting_to_re_source_an_aggregate_that_was_instantiated_using_a_snapshot_throws_if_the_specified_version_is_prior_to_the_snapshot()
{
// arrange
var account = new CustomerAccount()
.Apply(new ChangeEmailAddress(Any.Email()));
account.ConfirmSave();
var snapshot = account
.CreateSnapshot();
snapshot.Version = 10;
account = new CustomerAccount(snapshot);
// act
Action rollBack = () => account.AsOfVersion(9);
// assert
rollBack.ShouldThrow <InvalidOperationException>()
.And
.Message
.Should()
.Contain("Snapshot version is later than specified version.");
}
public async Task Repeated_ETags_are_not_repeated_in_the_snapshot()
{
var account = new CustomerAccount()
.Apply(new RequestSpam
{
ETag = "a"
})
.Apply(new RequestSpam
{
ETag = "a"
});
account.ConfirmSave();
var repository = new InMemorySnapshotRepository();
await repository.SaveSnapshot(account);
var snapshot = await repository.GetSnapshot(account.Id);
snapshot.ETags
.Should()
.ContainSingle(etag => etag == "a");
}