Request Fallback

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Both classes are on invocations. The response on requests is the fallback's.

See Request Handler Fallback.

def commands_mapper(mapper: cqrs.RequestMap) -> None:
    mapper.bind(
        CreateOrder,
        cqrs.RequestHandlerFallback(CreateOrderHandler, CreateOrderFallback),
    )

result = await harness.mediator.send(CreateOrder(sku="book"))
assert result.source == "fallback"
harness.invocations.assert_entered(CreateOrderHandler)
harness.invocations.assert_entered(CreateOrderFallback)

Library example: examples/testing/fallback.py.