Event Fallback

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Both classes are on invocations. The primary handler is entered, then the fallback.

See Event Handler Fallback.

def domain_events_mapper(mapper: cqrs.EventMap) -> None:
    mapper.bind(
        OrderCreated,
        cqrs.EventHandlerFallback(AuditHandler, AuditFallback),
    )

await harness.mediator.send(CreateOrder(sku="book"))
harness.invocations.assert_entered(AuditHandler)
harness.invocations.assert_entered(AuditFallback)

Library example: examples/testing/fallback.py.