Containers for Real Integration Tests Philipp Krenn @xeraa
Slide 1
Slide 2
Developer
Slide 3
Tests
Slide 4
Slide 5
Slide 6
But the unit tests passed, so… https://twitter.com/Aaronius/status/ 933497253347463168
Slide 7
Slide 8
Slide 9
Slide 10
Slide 11
Slide 12
Integration Tests
Slide 13
Mocks
Slide 14
Mockito, EasyMock, JMock,…
Slide 15
Slide 16
Ich mock mir die Welt widdewidde wie sie mir gefällt
Slide 17
https://www.monkeyuser.com/2018/ happy-flow/
Slide 18
! Unit tests, systems not under your control ! Test real datastore
Slide 19
In-Memory
Slide 20
H2, HSQLDB, Apache Derby,…
Slide 21
Slide 22
Embedded Elasticsearch unsupported in 5.0+ https://www.elastic.co/blog/elasticsearch-the-server
Slide 23
! Often good enough ! Test real datastore, supported systems
Slide 24
Actual Datastore
Slide 25
Local installation Docker container Cloud
Slide 26
Demo
Slide 27
! “Good old approach” ! External dependency, parallelization
Slide 28
Embedded
Slide 29
embedded-elasticsearch https://github.com/allegro/embedded-elasticsearch
Slide 30
Demo
Slide 31
Customization & Mappings .withPlugin(“analysis-stempel”) .withIndex(“cars”, IndexSettings.builder() .withType(“_doc”, getSystemResourceAsStream(“car-mapping.json”))
Slide 32
! IDE support, customization, custom lifecycle ! Custom integration
Slide 33
More embedded datastores https://github.com/flapdoodle-oss/ de.flapdoodle.embed.process
Slide 34
Build Tool
Slide 35
docker-maven-plugin http://dmp.fabric8.io
Slide 36
Dockerfile or Docker assembly <build> <from>java:8</from> <assembly> <descriptor>docker-assembly.xml</descriptor> </assembly> <cmd> <shell>java -jar /maven/service.jar</shell> </cmd> </build>
Slide 37
Build a custom image: docker:build Run container: docker:start docker:stop
Slide 38
Demo
Slide 39
maven-failsafe-plugin https://maven.apache.org/surefire/maven-failsafe-plugin/
Slide 40
! Standard or custom Docker image ! One instance for all tests, no IDE support
Slide 41
Slide 42
Testcontainers Generic
Slide 43
Dependency @ClassRule public static GenericContainer redis = new GenericContainer(“redis:3.0.2”) .withExposedPorts(6379);
Slide 44
Docker Compose integration @ClassRule public static DockerComposeContainer environment = new DockerComposeContainer(new File(“src/test/resources/compose.yml”)) .withExposedService(“elasticsearch_1”, ELASTICSEARCH_PORT, Wait.forHttp(“/”).forStatusCode(200));
Slide 45
Demo
Slide 46
What’s in docker ps -a
Slide 47
Docker for Mac API: socat Linux: Multipurpose relay (SOcket CAT) https://github.com/alpine-docker/socat
Slide 48
Cleanup: Moby Ryuk https://github.com/testcontainers/moby-ryuk
Slide 49
[Ryuk] drops a Death Note, a notebook that allows the user to kill anyone simply by knowing their name and face https://en.wikipedia.org/wiki/Ryuk_(Death_Note)
Slide 50
! IDE support, customization, custom lifecycle ! Hacky configuration
Slide 51
Testcontainers Custom
Slide 52
Slide 53
ElasticsearchContainer https://www.testcontainers.org/modules/elasticsearch/
Slide 54
Demo
Slide 55
More languages Scala, Go, .net , Python , JavaScript , Rust * * * Early development * *
Slide 56
Selenium 2 / Webdriver VNC screen recording
Slide 57
! IDE support, customization, custom lifecycle ! Custom integration
Slide 58
Slide 59
Docker in Docker Or sidecar
Slide 60
$ docker run -it —rm -v $PWD:$PWD -w $PWD -v /var/run/docker.sock:/var/run/docker.sock maven:3 mvn —projects parent,4_testcontainers-custom test $ docker ps -a
Slide 61
Conclusion
Slide 62
Why Integration Tests
Slide 63
Why not Mocking In-Memory Actual Datastore
Slide 64
How Embedded Build Tool Testcontainers
Slide 65
Code https://github.com/xeraa/integration-test-demo
Slide 66
Questions? Philipp Krenn @xeraa
