Middleware

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middlewares.of(...).called_next is False when the middleware does not call handle. invocations does not contain the handler. requests holds the middleware response.

See Middlewares.

class DenyMiddleware:
    async def __call__(self, request, handle):
        return CreatedOrder(order_id="denied")

async with test_harness(container, commands_mapper=commands_mapper, middlewares=[DenyMiddleware()]) as harness:
    result = await harness.mediator.send(CreateOrder(sku="book"))
    assert result.order_id == "denied"
    harness.invocations.assert_not_entered(CreateOrderHandler)
    assert harness.middlewares.of(DenyMiddleware)[0].called_next is False

Library example: examples/testing/middleware.py.