Consumer Driven Contract testing with Pact JS

1. Deploy with Confidence
Consumer Driven Contract tests with Pact

2. Scenario
Micro Service 1
Micro Service 2 Micro Service 3 Micro Service 4

3. Scenario (cont.)
Micro Service 1
Micro Service 2 Micro Service 3 Micro Service 4
Test
Test
Test
Test Test

4. Scenario (cont.)
Micro Service 1
Micro Service 2 Micro Service 3 Micro Service 4
Test
Test
Test
Test Test

5. Scenario (cont.)
Micro Service 1
Micro Service 2 Micro Service 3 Micro Service 4
Test
Test
Test
Test Test
dev sit
test
dev sit
test
dev sit
test

6. Scenario (cont.)
Micro Service 1
Micro Service 2 Micro Service 3 Micro Service 4
Test
Test
Test
Test Test

7. Scenario (cont.)
Micro Service 1
Micro Service 2 Micro Service 3 Micro Service 4
Test
Test
Test
Test Test
3RD PARTY
SOFTWARE

8. “Integrated tests are a scam”
Talk by J. B. (Joe) Rainsberger
http://bit.ly/29IHASL
(presentation)
http://bit.ly/29uw8GX
(blogpost)

9. “Integrated tests are a scam”
▪ They take too long to run
▪ Infrastructure pain
▪ Unreliable
▪ Costly

10. Consumer Driven Contracts
(Testing)
Ian Robinson

11. Consumer Driven Contract (Testing)
List of agreements between
Consumer and Provider

12. Consumer Driven Contract (Testing)
List of agreements between
Consumer and ProviderRequest / Response pair

13. Consumer Driven Contract (Testing)
Consumer Driven Contract is a pattern that
drives the development of the Provider
from its Consumers point of view

14. Micro Service 1
Micro Service 2 Micro Service 3 Micro Service 4

15. Consumer 2
Provider Consumer 1 Consumer 3

16. Consumer 2
Provider Consumer 1 Consumer 3

17. Consumer 2
Provider Consumer 1 Consumer 3

18. Benefits?
▪ Provider knows when a consumer will break
▪ Documentation
▪ Test independence

19. Pact
Pact is a testing tool that guarantees
those Contracts are satisfied
pact.io

20. Pact
▪ Essentially TDD for Services
▪ Fail fast, recover fast
▪ Started at REA with a Ruby implementation
▪ Now available in
▪ JVM (Java, Scala, Groovy)
▪ .NET
▪ Javascript / Node
▪ Go
▪ Swift

21. 2-Step Process

22. 2-Step Process

23. Pact JS
▪ Under github.com/pact-foundation
▪ pact-js
▪ karma-pact
▪ pact-node
▪ pact-js-mocha (WIP)

24. karma-pact
▪ Plugin for Karma
▪ Manages Provider Mock Server

25. Pact Node
▪ Wraps the Ruby Provider Mock Server
▪ Allows for interaction recording and verification
▪ Enables Pact publishing
▪ Enables management of multiple servers

26. Pact JS Mocha
▪ Abstracts the DSL
▪ “Extends” Mocha’s BDD interface
▪ Less boilerplate
▪ Improved readability
▪ Still WIP (feedback welcome!)

27. Code
Consumer
HTTP
Client
Provider
GET consumer/projects/1/tasks
GET provider/tasks

28. Sharing Pacts
▪ Pact Broker
▪ There’s even a Docker container!
▪ Has to run on port 80 though

29. Pact JS

30. ▪ docs.pact.io
▪ Gitter
▪ gitter.im/pact-foundation
▪ gitter.im/realestate-com-au/pact
▪ gitter.im/DiUS/pact-jvm
▪ groups.google.com/forum/#!forum/pact-support
Finding Help

31. Thanks! Questions?
@tarciosaraiva @pact_up