Contract Testing with PACT @[email protected] 1 

@[email protected] 2 

Demo Time: There's a Bug @[email protected] 3 

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? @[email protected] 4 

Integration Testing @[email protected] 5 

@[email protected] 6 

@[email protected] 7 

Difficulties Difficulties Difficulties Difficulties Difficulties Test environment needed Spin up on demand? Test Data Management! @[email protected] 8 

Integration vs. Integrated Testing @[email protected] 9 

Integrated Test Integrated Test Integrated Test Integrated Test Integrated Test @[email protected] 10 

@[email protected] 11 

Integration Test Integration Test Integration Test Integration Test Integration Test @[email protected] 12 

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 @[email protected] 13 

Testing Locally? @[email protected] 14 

@[email protected] 15 

@[email protected] 16 

@[email protected] 17 

Across Service Boundaries Across Service Boundaries Across Service Boundaries Across Service Boundaries Across Service Boundaries @[email protected] 18 

@[email protected] 19 

Better Contract Testing with Pact https://pact.io/ @[email protected] 20 

@[email protected] 21 

Demo Time: Let's Find the Bug! @[email protected] 22 

Advantages Advantages Advantages Advantages Advantages Both parts can be tested independently and locally Pact ensures consistency between tests @[email protected] 23 

Pact Broker, Can I Deploy?, ... @[email protected] 24 

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 @[email protected] 25 

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 @[email protected] 26 

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 @[email protected] 27 

$ 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 @[email protected] 28 

$ 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 @[email protected] 29 

To Recap... @[email protected] 30 

Pact can help you find communication problems early You probably still need some integration tests (and even integrated tests) @[email protected] 31 

About David About David About David About David About David Trainer, Coach, Developer https://davidtanzer.net @[email protected] Slides: speakerdeck.com/dtanzer/ 

Press [ESC] to exit presentation... Presented with Presented with Presented with Presented with Presented with marmota.app @[email protected] 33 

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