Contract Testing with Pact

Transcript

1. Contract Testing with PACT @dtanzer@social.devteams.at 1
2. @dtanzer@social.devteams.at 2
3. Demo Time: There's a Bug @dtanzer@social.devteams.at 3
4. Today... Today... Today... Today... Today... Integration Testing Integration vs. Integrated Testing Testing Locally? -> Contract Testing Better Contract Testing with Pact Pact Broker Can I deploy? @dtanzer@social.devteams.at 4
5. Integration Testing @dtanzer@social.devteams.at 5
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8. Difficulties Difficulties Difficulties Difficulties Difficulties Test environment needed Spin up on demand? Test Data Management! @dtanzer@social.devteams.at 8
9. Integration vs. Integrated Testing @dtanzer@social.devteams.at 9
10. Integrated Test Integrated Test Integrated Test Integrated Test Integrated Test @dtanzer@social.devteams.at 10
11. @dtanzer@social.devteams.at 11
12. Integration Test Integration Test Integration Test Integration Test Integration Test @dtanzer@social.devteams.at 12
13. Integrated Integrated Integrated Integrated Integrated Pros Comprehensive "Smoke-Test" Cons Slow All parts must be running Hard to maintain Hard to pin failures Test Data Management Integration Integration Integration Integration Integration Pros Easier to maintain Test can run locally Usually faster Test data setup easier Cons No complete workflow Pros & Cons Pros & Cons Pros & Cons Pros & Cons Pros & Cons @dtanzer@social.devteams.at 13
14. Testing Locally? @dtanzer@social.devteams.at 14
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18. Across Service Boundaries Across Service Boundaries Across Service Boundaries Across Service Boundaries Across Service Boundaries @dtanzer@social.devteams.at 18
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20. Better Contract Testing with Pact https://pact.io/ @dtanzer@social.devteams.at 20
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22. Demo Time: Let's Find the Bug! @dtanzer@social.devteams.at 22
23. Advantages Advantages Advantages Advantages Advantages Both parts can be tested independently and locally Pact ensures consistency between tests @dtanzer@social.devteams.at 23
24. Pact Broker, Can I Deploy?, ... @dtanzer@social.devteams.at 24
25. Pact Broker Pact Broker Pact Broker Pact Broker Pact Broker Server Software Records versions of consumers and verified providers https://pactflow.io/ Or run docker image @dtanzer@social.devteams.at 25
26. Usage Usage Usage Usage Usage 1. Consumer CI build Run Pact tests Publish Pact Triggers Provider Tests 2. Provider CI build Runs Pact verification If the pact verification fails, the build fails Can I deploy? Deploy 3. Back to the Consumer CI build Can I deploy? Deploy @dtanzer@social.devteams.at 26
27. Can I Deploy? Can I Deploy? Can I Deploy? Can I Deploy? Can I Deploy? Consumer Provider Verified 22 56 true 23 56 true 23 57 false 23 58 true 24 58 true 25 58 false @dtanzer@social.devteams.at 27
28. $ pact-broker record-deployment --pacticipant Bar --version 56 \ --environment production Consumer Provider Verified 22 56 (production) true 23 56 (production) true 23 57 false 23 58 true 24 58 true 25 58 false @dtanzer@social.devteams.at 28
29. $ pact-broker can-i-deploy --pacticipant Foo --version 23 \ --to-environment production Computer says yes \o/ CONSUMER | C.VERSION | PROVIDER | P.VERSION | SUCCESS? | RESULT# ---------|------------|----------|------------|----------|-------- Foo | 23 | Bar | 56 | true | 1 $ pact-broker can-i-deploy --pacticipant Foo --version 24 \ --to-environment production Computer says no ¯_(ツ)_/¯ CONSUMER | C.VERSION | PROVIDER | P.VERSION | SUCCESS? | RESULT# ---------|------------|----------|------------|----------|-------- Foo | 24 | Bar | 56 | false | 1 @dtanzer@social.devteams.at 29
30. To Recap... @dtanzer@social.devteams.at 30
31. Pact can help you find communication problems early You probably still need some integration tests (and even integrated tests) @dtanzer@social.devteams.at 31
32. About David About David About David About David About David Trainer, Coach, Developer https://davidtanzer.net @dtanzer@social.devteams.at Slides: speakerdeck.com/dtanzer/
33. Press [ESC] to exit presentation... Presented with Presented with Presented with Presented with Presented with marmota.app @dtanzer@social.devteams.at 33