Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
TestContainers + JUnit 5 = elegant integration...
Search
Nikolay Kuznetsov
November 07, 2019
Technology
2
340
TestContainers + JUnit 5 = elegant integration and e2e tests for microservices
Nikolay Kuznetsov
November 07, 2019
Tweet
Share
More Decks by Nikolay Kuznetsov
See All by Nikolay Kuznetsov
Integration testing with TestСontainers-Go
nikolayk812
0
130
Integration testing with TestContainers-Go
nikolayk812
0
250
Integration testing with TestСontainers and JUnit 5
nikolayk812
0
170
Integration and end-to-end testing with TestСontainers
nikolayk812
0
110
Integration and end-to-end testing with TestСontainers
nikolayk812
0
25
Other Decks in Technology
See All in Technology
「何となくテストする」を卒業するためにプロダクトが動く仕組みを理解しよう
kawabeaver
0
390
Language Update: Java
skrb
2
290
バイブスに「型」を!Kent Beckに学ぶ、AI時代のテスト駆動開発
amixedcolor
2
540
品質視点から考える組織デザイン/Organizational Design from Quality
mii3king
0
200
Rustから学ぶ 非同期処理の仕組み
skanehira
1
130
生成AI時代のデータ基盤設計〜ペースレイヤリングで実現する高速開発と持続性〜 / Levtech Meetup_Session_2
sansan_randd
1
150
5分でカオスエンジニアリングを分かった気になろう
pandayumi
0
240
なぜスクラムはこうなったのか?歴史が教えてくれたこと/Shall we explore the roots of Scrum
sanogemaru
5
1.6k
20250910_障害注入から効率的復旧へ_カオスエンジニアリング_生成AIで考えるAWS障害対応.pdf
sh_fk2
3
240
研究開発と製品開発、両利きのロボティクス
youtalk
1
520
人工衛星のファームウェアをRustで書く理由
koba789
15
7.7k
AIエージェント開発用SDKとローカルLLMをLINE Botと組み合わせてみた / LINEを使ったLT大会 #14
you
PRO
0
110
Featured
See All Featured
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
188
55k
No one is an island. Learnings from fostering a developers community.
thoeni
21
3.4k
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
32
1.5k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
31
2.2k
Faster Mobile Websites
deanohume
309
31k
Designing for Performance
lara
610
69k
Side Projects
sachag
455
43k
The Art of Delivering Value - GDevCon NA Keynote
reverentgeek
15
1.6k
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
rmw
34
3.1k
Building a Modern Day E-commerce SEO Strategy
aleyda
43
7.6k
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
229
22k
The MySQL Ecosystem @ GitHub 2015
samlambert
251
13k
Transcript
TestContainers + JUnit 5 = elegant integration and e2e tests
for microservices Nikolay Kuznetsov @nikolayk812 TESTING UNITED Vienna, 7 November 2019
About me • Go developer at Zalando Helsinki • Java
developer at Infobip, DevExperts • C developer at Samsung, Motorola
My testing experience • Unit, integration and end-to-end automated tests
development • Various organizational structures ◦ Separate QA teams ◦ QA engineers in a dev team ◦ No QA teams/engineers at all
Key points • Targeting automated testing • Examples and demos
in Java: TestContainers-Java, JUnit 5, Spring Boot • Principles are language-agnostic
Why integration testing?
2 unit tests, 0 integration tests
Tests trade-offs
None
Basic integration test
Integration testing evolution • In-memory mocking • Local DBs •
Vagrant • Docker, Docker Compose • Docker API
Docker architecture
How to start a container for test? • Shell scripts
• Maven plugin • Docker Compose • Docker API • MiniKube, Kubernetes
Shell scripts
Maven plugin github.com/fabric8io/docker-maven-plugin
Docker Compose
Docker API
None
TestContainers flavors
TestContainers Java • github.com/testcontainers/testcontainers-java • Wraps docker-java library • Docker
environment autodiscovery • Host port randomization • Containers clean up on JVM shutdown • Readiness waiting strategies
As simple as var redis = new GenericContainer("redis:5.0.5") .withExposedPorts(6379); var
postgres = new PostgreSQLContainer();
Docker environment autodiscovery
Host port randomization • Prevents port conflicts • Enables parallel
CI builds • API to get an actual host port
Containers cleanup github.com/testcontainers/moby-ryuk
Readiness waiting strategies • Host port • HTTP status/body •
Log message • Docker healthcheck • Combination of above • Custom
Demo setup User Service
Demo scenario User Service INSERT INTO SELECT FROM
Demo github.com/nikolayk812/tu-tc-demo
Demo recap • JUnit 5 integration via Extension API ◦
@TestContainers / @Container • TestContainers Modules ◦ 14 databases ◦ Kafka, MockServer, LocalStack, ToxiProxy, etc
JUnit 5 Extensions • Customizable extension points: ◦ Life-cycle phases
◦ Parameter resolution ◦ Conditional execution, etc • Extension logic registered with @ExtendsWith
github.com/nikolayk812/tu-tc-demo Demo-2: setup User Service
Demo-2: scenario User Service POST /users GET /user/<id>
Demo-2: Docker network User Service user-alias: 8083 postgres-alias: 5432 localhost:
32812
Demo 2 github.com/nikolayk812/tu-tc-demo
Demo-2: recap • Docker network and alias
Why end-to-end testing? • Business flows across multiple services •
Regression, when ◦ + new service ◦ - legacy service
Testing/staging deployed cluster Spring Cloud Kubernetes
Testing against a deployed cluster • Deploy a new service
version to the cluster? • Unexpected versions of dependent services • Unexpected database states ◦ Care to clear after the test? • Parallel CI builds?
On-demand cluster for E2E tests + Locally and at CI
machines + Control over dependent services versions - Time to start all containers - Resources: memory and CPU How to do it?
Kubernetes for E2E tests?
Kubernetes for E2E tests - YAGNI TestContainers + Docker network!
E2E test setup User Service Item Service
Takeaways • https://testcontainers.org • Balance between flexibility, speed and features
• Works on Mac, Linux, Windows
QUESTIONS ?