Microservices Pain: Testing
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Testing Microservices is hard! Or is it really? One of the precepts of TDD is that if something is hard to test, then potentially the design itself is at faulty. With a sweep through design options for Microservices, it can be shown that testing Microservices does not have to be hard, and can become as straightforward as any other test. This does require a radically different design philosophy, which this talk will review and show applied.
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Microservices Pain: Testing
- 2. David Dawson CEO GoMicro.Services London Microservices User Group Founder & Lead david.dawson@gomicro.services @davidthecoder
- 4. Isolation
- 5. Aspiration
- 14. All done?
- 15. What Pains You?
- 16. Testing?
- 20. A brief history of Testing
- 23. Aka Stateist TDD
- 24. What does this look like?
- 31. What does this look like?
- 36. Microservices?
- 43. 1 * GET /awesome 2 * POST /hello
- 44. 1 * GET /awesome 2 * POST /hello Start up Mock Dependencies Start service under test Exercise ServiceExercise Service Verify Mock Interactions
- 45. 1 * GET /awesome 2 * POST /hello
- 46. Client Libraries, then Mock Pro Simple, In Process Con Doesn't exercise the full Stack
- 47. Protocol Replay Pro Simple, In Process Con Schema Drift Not Really a Mock https://github.com/ozeias/go-vcr https://relishapp.com/vcr/vcr/docs http://freeside.co/betamax/
- 48. Mock Processes Pro Full Stack Con Schema Drift Hard to Orchestrate The Network Hates You
- 49. Remote Control Set Expectations Verify Expectations Making Mock (/ Stub) Processes
- 50. Orchestrating Docker Compose docker-compose.yml rabbitmq: image: rabbitmq:3.5.4-management service-under-test: build: . links: - rabbitmq test-with-deps: image: simplicityitself/test-with-deps links: - rabbitmq volumes: - ./test-results:/app/test-results/
- 51. Orchestrating Docker Compose docker-compose.yml rabbitmq: image: rabbitmq:3.5.4-management service-under-test: build: . links: - rabbitmq test-with-deps: image: simplicityitself/test-with-deps links: - rabbitmq volumes: - ./test-results:/app/test-results/
- 52. Orchestrating Docker Compose docker-compose.yml rabbitmq: image: rabbitmq:3.5.4-management service-under-test: build: . links: - rabbitmq test-with-deps: image: simplicityitself/test-with-deps links: - rabbitmq volumes: - ./test-results:/app/test-results/
- 53. Orchestrating Docker Compose docker-compose.yml rabbitmq: image: rabbitmq:3.5.4-management service-under-test: build: . links: - rabbitmq test-with-deps: image: simplicityitself/test-with-deps links: - rabbitmq volumes: - ./test-results:/app/test-results/
- 54. Orchestrating Docker Compose > docker-compose run test-with-deps > docker-compose stop > ls test-results/ xunit.xml
- 57. Events
- 60. Order Placed Payment Taken Email Sent Events
- 61. Order Stream Notification Stream Payment Stream Events
- 67. Order Stream Events An Entity
- 71. Order Stream Notification Stream Payment Stream Events
- 72. Order Stream Notification Stream Payment Stream
- 73. Order Stream Notification Stream Payment Stream
- 74. Order Stream Notification Stream Payment Stream
- 75. Order Stream Notification Stream Payment Stream
- 77. Order Placed Payment Taken Email Sent Email Sent
- 78. Dependencies
- 79. Dependencies Order Placed Payment Taken Email Sent Email Sent
- 80. Dependencies Order Placed Order Creation Service Payment Taken Payment Processor Email Sent Email Gateway Email Sent Email Gateway
- 81. Order Placed Payment Taken Email Sent Email Sent Testing Order Placed
- 82. Testing Order Placed Payment Taken Email Sent Email Sent A TEST
- 83. Testing! Order Placed Email Sent A TEST Mock Payment Service?
- 84. Order Stream Notification Stream Payment Stream
- 85. Testing! Order Placed Payment Taken Email Sent Email Sent A TEST
- 86. Testing! Order Placed Payment Taken Email Sent Email Sent
- 87. Set initial event chain state Run service Assert event chain end state Event based test
- 88. Event Store Event Chains (Graph DB is good) Best for testing system state mutation (commands) Event based test You'll need...
Editor's Notes
- Isolation! Aspiration Evolution Ability to change
- Dan North Bounded/ Centred Community
- Not the solution! An approach to solving the problem. Tools to engage the world Sounds familiar.
- h
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- Ask the audience. One big one.
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- Isolate an algorithmic, functional piece. More suited to functional style, rather than encapsulated OO/ Entity style
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- TALK TO MUNIB!