The document discusses different approaches to testing services including end-to-end, isolation, and contract tests. It focuses on contract tests, explaining that they allow integration tests against mocks while ensuring the mocks accurately represent external dependencies. It provides details on consumer-driven and provider-driven contract tests, highlighting benefits of the consumer-driven approach. The document outlines the six key steps to implement contract testing in a continuous integration/continuous delivery pipeline using a pact broker to manage contracts.

1. Contract tests
Sławomir Radzymiński

4. Attempt #1 - E2E tests

6. Tests passed :)

9. Test failed :(

11. Attempt #2 - isolation

12. Mocks everywhere...

13. Tests passed :)

15. Tests passed :)

16. But would it work on prod...

19. Attempt #3 -
testing mocks (???)

21. Contract tests
Contact tests lets you do integration
tests against mocks while ensuring that
your mocks are accurate representation
of external dependencies.

22. Contract tests
Contact tests should not be used to test
the services internal logic

23. Provider Driven
Contract Test (PDC)
Consumer Driven
Contract Test (CDC)

24. Consumer Driven Contract Test -why?
1. Easier to find unused Provider API - less
things to test :)

25. Consumer Driven Contract Test -why?
1. Easier to find unused Provider API - less
things to test :)
2. Consumer is closer to actual business and
better suited for change requests

26. Contract -6 paragraphs
1. Pact Broker
2. Contract definition on client side
3. Contract verification on client side
4. Contract publish to Packt Broker
5. Contract verification on provider side
6. CI/CD

27. 1.Pact Broker

28. 2.Contract definition on client side (1/5)

29. 2.Contract definition on client side (2/5)

30. 2.Contract definition on client side (3/5)

31. 2.Contract definition on client side (4/5)

32. 2.Contract definition on client side (5/5)

33. 3.Contract verification on client side (1/3)

34. 3.Contract verification on client side (2/3)
Three steps to success :)
- @Autowire your client
- Build & send a request
- Serialize response & assert a field

35. 3.Contract verification on client side (3/3)

36. 4.Contract publish to Pact Broker

37. 5.Contract verification on provider side (1/3)

38. 5.Contract verification on provider side (2/3)

39. 5.Contract verification on provider side (3/3)

40. 6.CI/CD
Webhooki
Can I deploy?

41. Challenge

42. Bibliography
https://github.com/slawekradzyminski/PactExample