Tests d'intégration de micro-services : approche pilotée par les contrats - RENE - Atos - Soirée du Test Logiciel Sophia 2019

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17-10-19
© Atos
Tests d'intégration de micro-services :
approche pilotée par les contrats

| 17-10-2019 | 3ème édition Soirée du Test Logiciel Sophia #STLS2019
Who I am ?
▶ Sébastien René
– Solution Architect
– Atos Expert Community
@sebastienrene

| 17-10-2019 | 3ème édition Soirée du Test Logiciel Sophia #STLS20193
Microservice architecture

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Microservice architecture

| 17-10-2019 | 3ème édition Soirée du Test Logiciel Sophia #STLS20195
A new application

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Have to deal with versions
v1 v5 v2
v2 v5 v1

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API documentation is static
Swagger UI
OpenAPI spec Service2
OpenAPI spec Service1
OpenAPI spec

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Application automated build, deployment, test
and release
Deployment
Pipeline
Code BinariesBuild & Package
Provisioning Environments
Functional Non functional (security,
performance,..)
Code
Orchestrate
B
Register
code
A Register
binaries
DBuild / Assemble
Verify complete
C
Verify
code
E
Deploy /
Release
F
Verify
functional
G Verify
non-functional
H
Define Design
TestRequest Business value
Release
Configure &
Develop
Development Production
Quality
control
Test & Acceptance (on demand) I

| 17-10-2019 | 3ème édition Soirée du Test Logiciel Sophia #STLS2019
▶ Advantages:
– Simulates production.
– Tests real communication between services.
▶ Disadvantages :
– To test one microservice, we have to deploy all microservices, databases, …
– The environment where the tests run is locked for a single suite of tests
(nobody else would be able to run the tests in the meantime).
– They take a long time to run.
– The feedback comes very late in the process.
– They are extremely hard to debug.
9
End to end platform tests

| 17-10-2019 | 3ème édition Soirée du Test Logiciel Sophia #STLS2019
▶ Advantages:
– They provide very fast feedback.
– They have no infrastructure requirements.
▶ Disadvantages:
– The implementor of the service creates stubs that might have nothing to do
with reality.
– You can go to production with passing tests and failing production.
10
Mock other services

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Contract testing
Consumer testing Provider verification

| 17-10-2019 | 3ème édition Soirée du Test Logiciel Sophia #STLS2019
▶ Test the interactions between
applications
▶ Make IT test easier to implement /
automate
▶ Acceptance test-driven developement
▶ Publish changes in contracts that are
immediately visible on both sides
12
Why I should use contracts ?
Enable
▶ Simulate all business features
▶ Create test scenario
▶ Performance and load testing
Not suitable for

| 17-10-2019 | 3ème édition Soirée du Test Logiciel Sophia #STLS2019
▶ Provider Contracts
– the producer of the API defines the
contracts and publishes it
– for producers that cannot directly
collaborate with their consumers
▶ Consumer-Driven Contracts
– the consumers describe how they
use the API
– for producer and consumer teams
working for the same organizations
13
Who creates the contract ?

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The tools

| 17-10-2019 | 3ème édition Soirée du Test Logiciel Sophia #STLS2019
▶ Spring Cloud Contracts
– Tests and stubs generator
• REST API
• Messaging
– Contracts and stub storage
• Nexus / Artifactory
• Git
• Pact
– Stub runner (WireMock)
15
The tools

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What is a Contract?

| 17-10-2019 | 3ème édition Soirée du Test Logiciel Sophia #STLS201917
Maven Workflow
Contract
verifier
Contract
stub
runner
Contract
Maven Repo

| 17-10-2019 | 3ème édition Soirée du Test Logiciel Sophia #STLS201918
Git Workflow
Contract
verifier
Contract
stub
runner
Contracts
Git repo
Merge request Take over MR

| 17-10-2019 | 3ème édition Soirée du Test Logiciel Sophia #STLS201919
Demo

| 17-10-2019 | 3ème édition Soirée du Test Logiciel Sophia #STLS201920
Merci aux Sponsors !

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