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Asynchronous Testing Patterns
11.1The Pattern MatrixAsynchronous testing requires different strategies depending on the system architecture. This reference covers the five core patterns for…11.2Pattern 1: Poll and WaitThe simplest async pattern. Check for the expected state within a timeout.11.3Pattern 2: Callback CaptureSpin up a temporary HTTP server, register it as a webhook target, and capture incoming calls.11.4Pattern 3: Queue DrainRead from a message queue until all expected events have arrived or timeout.11.5Pattern 4: Trace CorrelationUse a correlation ID to trace an event chain across multiple services.11.6Pattern 5: Snapshot ComparisonCompare database state before and after an event to verify the event's side effects.11.7Pattern Selection Guide11.8Common Pitfalls in Async TestingWhen testing ordering, always verify with indexed assertions, not just presence checks:11.9Key TakeawayAsynchronous testing requires explicit patterns for waiting, capturing, and verifying. The five patterns (poll-and-wait, callback capture…