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Kafka and JMS Mocking with AsyncAPI using Specmatic Hari Krishnan Co-Founder and CTO at Specmatic AACoT’23 AACoT’23

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© 2023 All Rights Reserved Production Architecture Request Response Request Response 1 2 3 4 5 Message Topic Domain Service App BFF Analytics Service

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© 2023 All Rights Reserved System Under Test Dependencies Test Test Mode Request Response Request Response 1 2 3 4 5 Message Topic Domain Service App BFF Analytics Service

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© 2023 All Rights Reserved Dependencies System Under Test Test Test Mode – Contract Test Setup Request Response Request Response 1 3 4 5 Message Contract Test Http Stub Kafka mock Broker (In-memory) Schema Validation Topic BFF Set Expectations 2 Set Expectations Verify message count and schema 7 8 6

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© 2023 All Rights Reserved Live Demo

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© 2023 All Rights Reserved Kafka Mock Validations Invoke Service A Service B 2 3 1

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© 2023 All Rights Reserved Integration testing is not an option

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© 2023 All Rights Reserved API Specifications as Executable Contracts Consumer Provider Service Virtualization Contract as Test

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© 2023 All Rights Reserved AsyncAPI spec as Test Request Reply Pattern

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© 2023 All Rights Reserved AsyncAPI Spec as Test (Request Reply Pattern) Contract as Test Request Reply API (System under Test) Consumer Business Logic Topics Offset validation Payload schema Counts API-Specification.yaml specmatic.json Payload validation Producer Send Verify Request Reply Send Verify Publish Topic commandRequest Subscribe Topic commandReply Subscribe Topic commandReply Publish Topic commandRequest Test data jsons

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© 2023 All Rights Reserved Single source of truth Service A Service B

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© 2023 All Rights Reserved Central Contract Repo – Contract as Code

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© 2023 All Rights Reserved Shift-left and kill integration tests

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© 2023 All Rights Reserved https://insights.specmatic.in/

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© 2023 All Rights Reserved BFF Controller Service BFF Controller Service JMS Mock Production Mode Test Mode 1 2 3 4 5 6 6 7 8 9 1 2 1 3 Set Expectations 2 Domain Service 7 HTTP stub 3 Set Expectations Broker (In-memory) Queue Schema Validation Verify Message Count & Schema 1 1 4 4 1 0 5 1 1 JMS Mocking using AsyncAPI https://specmatic.in/updates/jms-mocking-with-asyncapi-using-specmatic

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© 2023 All Rights Reserved Summary of supported capabilities https://specmatic.in/updates/jdbc-stubbing-with-specmatic-contract-testing https://specmatic.in/updates/redis-stubbing-with-specmatic-contract-testing And more… https://specmatic.in/category/features

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@harikrishnan83 hari@xnsio.com https://specmatic.in/ Thank you!

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Credits • Logos (OpenAPI, Swagger, WSDL, AsyncAPI, Kafka, ActiveMQ, JMS, Redis, JDBC) - Third party marks and brands are the property of their respective holders