Philipp Krenn @xeraa Real Integrat- 444 ion Tests with
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Infrastructure | Developer !
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Integration Tests
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But the unit tests passed, so... https://twitter.com/Aaronius/status/ 933497253347463168
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Mocking
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Mockito, EasyMock, JMock,...
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Ich mock mir die Welt widdewidde wie sie mir gefällt
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! Unit tests, systems not under your control ! Test real datastore
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In-Memory
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H2, HSQLDB, Apache Derby,...
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Embedded Elasticsearch unsupported in 5.0+ https://www.elastic.co/blog/elasticsearch-the-server
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! Often good enough ! Test real datastore, supported systems
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Actual Datastore
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Local installation Docker container Cloud
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Demo
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! "Good old approach" ! External dependency, parallelization
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In-Process
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de.flapdoodle. embed.process https://github.com/flapdoodle-oss/ de.flapdoodle.embed.process
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...will provide a platform neutral way for running processes in unittests.
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→ MongoDB de.flapdoodle.embed.mongo → Redis de.flapdoodle.de.embed.redis → Memcached de.flapdoodle.embed.memcached → PostgreSQL ru.yandex.qatools.embed → MySQL com.wix.mysql → Consul com.github.golovnin.embedded.consul → Vault com.github.golovnin.embedded.vault → InfluxDB io.apisense.embed.influx
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Build Tool
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docker-maven-plugin http://dmp.fabric8.io
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Build image: docker:build Run container: docker:start & docker:stop
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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
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Demo
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maven-failsafe-plugin https://maven.apache.org/surefire/maven-failsafe-plugin/
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! Plain or custom Docker image ! One instance for all tests
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Testcontainers
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Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases [...] that can run in a Docker container.
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Dependency @ClassRule public
static GenericContainer redis =
new GenericContainer( "redis:3.0.2" ) .withExposedPorts( 6379 );
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testcontainers-java- module-elasticsearch https://github.com/dadoonet/testcontainers-java-module- elasticsearch
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Demo
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Todo Set (randomized) port
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! Container per test Or reuse in static block ! Custom integration
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Conclusion
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Why Integration Tests
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Why not Mocking In-Memory Actual Datastore
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How In-Process Build Tool Testcontainers
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Code https://github.com/xeraa/integration- test-demo
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Questions? Philipp Krenn 4444 @xeraa
