Symfony Camp UA 2018

1. Contract testing. Изолированное тестирование
микросервисной архитектуры
Евгений Кузьмин, Александр Боровец
Smart Gamma

2. Integration Hell - how to avoid it?

4. Project V1 - monolith version
- Fuel control / GPS position system
- in-house fuel control hardware
- TomTom GPS position system as data gateway
- Monolith architecture for data processing via
WebFleet API
- UI customers area

5. Classic monolith testing
- Stable 3rd party API
- Classic testing requirements and approaches
- Data flows modeling before hardware is functional

6. Project’s evolution V2
- New 2nd sub-system for agriculture
- Extendable to 3rd sub-system for industry
- Own data processing system via GSM instead of
TomTom
- Universal hardware for all
sub-systems
- Hardware shop

7. End-2-end testing for data routing feature
- Mock entry point API with emulated flow
- Required etalon data fixtures preload or setup via QA API
- Setup test infrastructure with all services deployed
- Execute test
- Assert all expected behavior

8. End-2-end testing pros and cons
Trustfull
Create
Execute
Assert
Support
Detect reasons

9. Testing triangle problem

10. Integration testing
- Narrow execution area
- Narrow assertion area

11. Mock testing
- Fast
- Easy to create
- Environment independent

12. Mock testing problems
- Control mock “expiration”

13. Mock testing problems

14. What is a solution?
- Consumer-driven contracts
- Provider-driven contracts

15. https://docs.pact.io
“Do you set your house on fire
to test your smoke alarm?”
Pact PHP: https://github.com/pact-foundation/pact-php

16. Each consumer captures their expectations of the provider in a separate contract
Consumer-Driven Contracts

17. Pact framework
- Pact is contract testing framework
- Contract is a collection of
interactions.
- Each interaction consist of
expected request and minimal
expected response.

18. https://gist.github.com/Evgenas/ef21e19cfa894507d091985c45bddf12

19. https://gist.github.com/Evgenas/ef21e19cfa894507d091985c45bddf12

20. Pact Response Matchers

21. https://gist.github.com/Evgenas/ef21e19cfa894507d091985c45bddf12

22. Mock server

23. https://gist.github.com/Evgenas/ef21e19cfa894507d091985c45bddf12

24. Result of interaction builder at Pact contract file

25. https://gist.github.com/Evgenas/ef21e19cfa894507d091985c45bddf12

26. https://gist.github.com/Evgenas/ef21e19cfa894507d091985c45bddf12

27. Verify interaction on the consumer

28. Pact on Behat Scenario
PactContext.php src: https://gist.github.com/Evgenas/716fee55126b6e6617f34259a3e2636a

29. Writing Pact json file locally

30. Needs to define BROKER_URI

31. Pact Broker Service

32. Brocker Web UI
Docker image: https://github.com/DiUS/pact_broker-docker

33. Browse Pact file

34. Provider verification

35. Provider verification
- PACT verifier, and source of contract
- Requests replay

36. Verify provider - Phpunit test on provider side

37. Required data on provider
- Needs to define provider state per test case

38. Required data on provider

39. Provider state
State API

40. Given - Pact State(QA API)

41. Pact State Manager implementation on provider side
Link to github with bundle / implementation

42. Broker - result of verification
- Сonditions for passing the all test
- Services tested without real interaction

43. CI / Jenkins - Consumer flow

44. CI / Jenkins - consumer contract test

45. CI / Jenkins - trigger downstream provider job
https://gist.github.com/Evgenas/98a1a0f5d2f7665d36e430f687fbf4de

46. CI / Jenkins - Provider verify contract

47. CI / Jenkins - Resolve branches for the provider repo

48. CI / Jenkins - Resolve branches for the provider repo
https://gist.github.com/Evgenas/e9aed2460c7ba24f93c69884df9cc01a

49. CI / Jenkins - Provider flow

50. CI / Jenkins - Control backward compatibility by versions and tags
New consumer 1.0.2 changed schema expectation
New provider 1.0.2 changed provided schema
Provider 1.0.2 and Consumer 1.0.2 should be deployed simultaneously only!

51. https://gist.github.com/Evgenas/61ac7b6efb999896df9017194158cb4c

52. CI / Jenkins - deploy “can-i-deploy”
PACT Broker client: https://github.com/pact-foundation/pact_broker-client#can-i-deploy

53. evgeniy.k@smart-gamma.com
https://www.linkedin.com/in/evgeniy-kuzmin-03816a52/