Pacts to the Rescue - Making your microservices play nicely together with Consumer Driven Contracts
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The document discusses how consumer-driven contracts (CDCs), as implemented by the Pact framework, can help microservices interact reliably through contract testing. It outlines issues with traditional integrated tests, such as being slow, brittle, and difficult to maintain as services evolve. Pact addresses these by automating contract verification between independently-developed services through fast, isolated tests. This allows teams to catch integration issues early and continuously validate interoperability.
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Pacts to the Rescue - Making your microservices play nicely together with Consumer Driven Contracts
- 1. Pacts to the rescue! Making your microservices play nicely together ! with Consumer Driven Contracts! ! ! ! Beth Skurrie! @bethesque / @pact_up! bskurrie@dius.com.au
- 2. ! ! “Integrated tests are a scam. ! A self replicating virus ! that threatens ! the very health of your codebase, ! your sanity, ! and I'm not exaggerating when I say, ! your life.”! - JB Rainsberger
- 3. Integrated Tests: The Problems " Slow! " Easy to break! " Hard to fix! " Scales combinatorially 3 classes, 4 code paths each! 4 * 4 * 4 = 64 tests
- 4. Test Symmetry… how it works A B mock
- 5. Test 1 Test 2 Test 3 Integrated tests
- 7. Test Symmetry: The Problem " Lack of automated tools! " Relies on developer eternal vigilance! " Does not scale
- 8. Posed to Dius Do we have the technology to achieve test symmetry?
- 9. System Integration Tests: The WORST " Slower! " Easier to break! " Harder to fix! " Scales BADLY " Lots of set up! " Flakey! " Extra infrastructure
- 10. Pact to the rescue!!!
- 11. Pact… how it works C A P B mock pact
- 12. Problems with... Solved by Pact Test symmetry! " No automated tools! " Relies on developer eternal vigilance - not sustainable! " Does not scale! ! Integrated tests! " Slow! " Easy to break! " Hard to fix! " Scales combinatorially Test symmetry! " Automatically enforced! ! Integrated tests! " Fast! " Low set up! " Reliable! " Easier to debug! " Standalone CI build! " No extra infrastructure! " Scales linearly
- 14. Arrange - set up mock server
- 15. Arrange - set up expectations
- 16. Act and Assert
- 18. Set up provider
- 19. Set up test data Consumer assumed: Provider complies:
- 20. Verify: Success!
- 21. What’s in it for me? • Black box testing - quicker turn around for builds! • Exploratory testing - hints as to design weaknesses! • All testing - catch bugs before committing, support for continuous deployment!
- 22. “How is it working for you?” Before Pact! " A “certification” environment that took 2 months to set up! " Deploy all the things => deploy new thing => integration tests => pass ? deploy to production : try again! " Does not scale! ! With Pact! " 40+ microservices using Pact! " Green standalone CI builds ? deploy to production
- 23. In summary... Consumer Provider UI App Provid er Client API App DB Integrated test Test symmetry with Pact
- 24. Pact allows you to: " Reduce your defect turn around time! " Reduce the number of bugs that are committed into the codebase - immediate feedback on potential integration breakages! " Allows you to modify components with agility! " Have confidence that all the services in your system will work together! " Throw away your integration tests!!!
- 25. Pact! ! Makes your microservices play nicely together ! with Consumer Driven Contracts! ! github.com/realestate-com-au/pact! @pact_up! ! ! Beth Skurrie! bskurrie@dius.com.au @bethesque
- 26. P publish pact latest pact? tag “prod” pact deploy script prod pact? C Pact Broker