CQRS

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Event Sourcing

Event Sourcing Testing: How to Test Event-Sourced Systems Correctly

Event sourcing inverts the traditional data model — instead of storing current state, you store a sequence of events that describe what happened. This makes testing both easier and harder. Easier because events are immutable facts you can inspect directly. Harder because bugs in event replay logic corrupt all derived state,

Testing

Testing Event Sourcing and CQRS: Aggregates, Projections, and Event Handlers

Event sourcing is a different mental model for state. Instead of reading and writing a current state, you store a sequence of events and derive current state by replaying them. This has testing implications: you test the events that commands produce, not the state mutations directly. The Testing Model In