Release v22.41.0

Added

• DecisionReadAdmissions in Cratis.Arc.Chronicle.Testing checks, without executing any command, that Chronicle admits every DecisionRead<T> parameter of the Handle and Provide methods of [ProtectedDecision] commands, including inherited ones. DecisionReadAdmissions.ShouldAdmitDecisionReadsIn(assembly) throws DecisionReadsAreRefused, listing each command, read model and DecisionReadRefusalReason, so a refused shape such as children or a reducer fails a spec instead of every execution. See Check that Chronicle admits the decision reads. (#2929)

Changed

• A CommandScenario now resolves a read model, or a reducer's current state, the way production does, in every scenario and not only with UseDecisionReads(). A read model whose projection or reducer handles none of the events seeded for its event source now resolves as null instead of as an empty instance, so a non-nullable injected read model receives null; and a reducer receives null as current for its first event instead of a default instance. A spec that relied on the old behavior should seed an event the read model handles, pin the read model with .ReadModel(...), or have the reducer handle a null current. (#2928)

Fixed

• A decision-mode CommandScenario (UseDecisionReads()) now provides the reads that do not guard the decision: injected read models, IReadModels.GetInstanceById and an [Unprotected] command's DecisionRead<T> are projected from the events seeded with Given.ForEventSource(...).Events(...), the same log the decision reads fold, and can be pinned with .ReadModel(...). Pinning a read model that the command takes as a protected DecisionRead<T> still throws PinnedReadModelCannotProvideDecisionToken, now naming the command and read model. (#2928)
• A concurrency violation now reads "Event source '…' has new events since the command read it: expected no events, but it has events up to sequence number 0. Read it again and resubmit." instead of showing raw sentinel sequence numbers such as 18446744073709551613. (#2930)