Add MockBroker / MockTransport for deterministic protocol tests#2861
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Add MockBroker / MockTransport for deterministic protocol tests#2861
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In-memory mock broker infrastructure that plugs into kafka.net's KafkaConnection at the transport layer, enabling protocol-level tests without a real Kafka broker. MockTransport replaces KafkaTCPTransport: no sockets, no select(). On write(), it decodes framed Kafka requests, passes them to MockBroker for handling, and delivers response bytes back to the connection's data_received() via the event loop's call_soon. MockBroker provides: - Auto-responses for ApiVersionsRequest (with UnsupportedVersionError version negotiation per KIP-511) and MetadataRequest (configurable via set_metadata()) - respond(request_class, response) for scripted FIFO responses matched by API key - respond_fn(request_class, fn) for dynamic responses; fn can be sync or async (coroutine) to support delay injection via await net.sleep() - attach(manager) to monkey-patch a KafkaConnectionManager - client_factory() returning a kafka_client= callable for use with KafkaConsumer, KafkaProducer, and KafkaAdminClient constructors 10 tests covering: unit-level construction/queuing, bootstrap round-trip, topic metadata, scripted responses, metadata updates, send/receive, ApiVersions version negotiation, and KafkaAdminClient integration. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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In-memory mock broker infrastructure that plugs into kafka.net's
KafkaConnection at the transport layer, enabling protocol-level tests
without a real Kafka broker.
MockTransport replaces KafkaTCPTransport: no sockets, no select().
On write(), it decodes framed Kafka requests, passes them to
MockBroker for handling, and delivers response bytes back to the
connection's data_received() via the event loop's call_soon.
MockBroker provides:
version negotiation per KIP-511) and MetadataRequest (configurable
via set_metadata())
matched by API key
sync or async (coroutine) to support delay injection via
await net.sleep()
KafkaConsumer, KafkaProducer, and KafkaAdminClient constructors
10 tests covering: unit-level construction/queuing, bootstrap
round-trip, topic metadata, scripted responses, metadata updates,
send/receive, ApiVersions version negotiation, and KafkaAdminClient
integration.
Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com