Pacts to the rescue!€¦ · Arrange - set up mock server . Arrange - set up expectations . Act and...

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Pacts to the rescue! Making your microservices play nicely together with Consumer Driven Contracts Beth Skurrie @bethesque / @pact_up [email protected]

Transcript of Pacts to the rescue!€¦ · Arrange - set up mock server . Arrange - set up expectations . Act and...

Page 1: Pacts to the rescue!€¦ · Arrange - set up mock server . Arrange - set up expectations . Act and Assert . Set up provider . Set up test data Consumer assumed: Provider complies:

Pacts to the rescue! Making your microservices play nicely together

with Consumer Driven Contracts Beth Skurrie @bethesque / @pact_up [email protected]

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“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

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Integrated Tests: The Problems

●  Slow ●  Easy to break ●  Hard to fix ●  Scales combinatorially

3 classes, 4 code paths each 4 * 4 * 4 = 64 tests

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A B

mock

Test Symmetry… how it works

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Test 1

Test 2

Test 3

Integrated tests

Page 6: Pacts to the rescue!€¦ · Arrange - set up mock server . Arrange - set up expectations . Act and Assert . Set up provider . Set up test data Consumer assumed: Provider complies:
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●  Lack of automated tools ●  Relies on developer eternal vigilance ●  Does not scale

Test Symmetry: The Problem

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Do we have the technology to achieve test symmetry?

Posed to Dius

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System Integration Tests: The WORST

●  Slower ●  Easier to break ●  Harder to fix ●  Scales BADLY ●  Lots of set up ●  Flakey ●  Extra infrastructure

Page 10: Pacts to the rescue!€¦ · Arrange - set up mock server . Arrange - set up expectations . Act and Assert . Set up provider . Set up test data Consumer assumed: Provider complies:

Pact to the rescue!!!

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A B

mock

C P

pact

Pact… how it works

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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

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Better API design!

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Arrange - set up mock server

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Arrange - set up expectations

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Act and Assert

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Set up provider

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Set up test data

Consumer assumed:

Provider complies:

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Verify: Success!

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Support

●  JSON is language independent ●  Ruby ●  JVM (Java and Scala) ●  Validate against any running provider using either library ●  Pact specification ●  JS library next - volunteers anyone? ●  Janus ●  Shokkenki

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“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

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Provider Consumer

In summary...

UI App Provid

er Client

API App DB

Integrated test

Test symmetry with Pact

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Pact allows you to:

●  Combine the advantages of integrated tests and test symmetry ●  Mitigates the shortcomings of each method ●  Allows you to modify components with agility - quick feedback on

potential breakages ●  Have confidence that all the services in your system will work

together ●  Throw away your integration tests!!!

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Pact Makes your microservices play nicely together with Consumer Driven Contracts github.com/realestate-com-au/pact @pact_up Beth Skurrie [email protected] @bethesque

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P

publish pact latest pact?

tag “prod” pact

deploy script

prod pact?

C

Pact Broker


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