CodeOne SF 2018: "Testing Java Microservices: From Development to Production"
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The document discusses the complexities of testing Java microservices, highlighting the importance of focusing on integration surfaces and isolating services for effective testing. It emphasizes the need for tests that closely resemble production environments and advocates for prioritizing security testing. The authors also describe various types of test doubles and the challenges associated with local testing due to dependencies and lack of shared environments.
CodeOne SF 2018: "Testing Java Microservices: From Development to Production"
- 1. Testing Java Microservices: From Development to Production Abraham Marin-Perez | Daniel Bryant
- 2. tl;dr ● Testing microservices brings additional challenges ● Pay special attention to integration surfaces ● Isolate services for loosely coupled tests ● Include tests that resemble production ● Make security testing a first-class citizen
- 3. Who are we? @danielbryantuk Tech Consultant and Writer Product Architect at Datawire Java Champion Conference tourist @abrahammarin Developer, Consultant, Writer Associate of Equal Experts Software Plumber
- 4. Types of tests From Agile Testing, by Lisa Crispin and Janet Gregory
- 5. Challenges ● Cannot share a single environment: test locally ● Full ecosystem unsuitable for local testing ● Lack of control over third-party dependencies
- 6. Isolation
- 10. Isolating Parts: No Isolation Third Party
- 11. Isolating Parts: No Isolation Third Party https://www.continuousdeliveryconsulting.com/blog/end-to-end-testing-considered-harmful/
- 12. Isolating Parts: Unowned Components Third Party
- 13. Test Doubles
- 14. Test Doubles Dummy objects: passed around but never actually used. Fake objects: working implementations not suitable for production Stubs: provide canned answers to calls made during the test Spies: stubs that also record some information based on how they were called. Mocks: objects pre-programmed with expectations which form a specification of the calls they are expected to receive. Virtualisations: emulation of services, with expectations (not suitable for production)
- 21. JUnit Example
- 22. API Simulation Thoughts ● Useful when a dependency is “expensive” to access or tricky to mock ● Facilitates error handling tests when dependency failure modes are challenging to recreate ● Simulations can be fragile and/or complicated
- 23. Use simulations appropriately... Sometime you need the real thing
- 25. Isolating Parts: Service Interaction Third Party
- 27. API Contracts APIs are service contracts Many are producer-driven It’s possible to design outside-in: Consumer-Driven Contracts
- 29. Consumer-Driven Contract Frameworks https://docs.pact.io/ https://cloud.spring.io/spring-cloud-contract/
- 30. Consumer-Driven Contract Thoughts ● Great in low trust or low communication organisations ○ Act as a cue for a conversation ● Can be used to implement “TDD for the API” ● Resource intensive to create and maintain
- 32. Components
- 33. Isolating Parts: Single Service Third Party
- 34. Isolating Parts: Single Service
- 35. Isolating Parts: Single Service Test Doubles
- 36. Isolating Parts: Single Service
- 37. Isolating Parts: Single Service +
- 38. Isolating Parts: Single Service Fault Tolerance Test double configured to fail
- 40. Isolating Parts: Technicalities Third Party
- 41. Isolating Parts: Technicalities Test the Real Thing
- 45. Isolating Parts: Data Test Data ● Low Volume ● Low Diversity Production Data ● High Volume ● High Diversity
- 51. Security: Code
- 54. Conclusion ● Testing microservices brings additional challenges ● Pay special attention to integration surfaces ● Isolate services for loosely coupled tests ● Include tests that resemble production ● Make security testing a first-class citizen
- 55. Thanks! Some code samples: https://github.com/orgs/continuous-delivery-in-java (with more coming soon!) https://www.safaribooksonline.com/library/view/continuous-delivery-in/9781491986011/