TESTING WITH DOCKER MACIEJ BIŁAS 

TESTING WITH DOCKER WHO AM I ▸ Software engineer at Adform Research ▸ ~10 years of JVM programming ▸ ~3 years commercial experience with Scala (+2 as hobby language) @maciejb Speaker Deck: maciejb /maciej 

TESTING WITH DOCKER AGENDA ▸ What is Docker about? ▸ Docker + tests ▸ Discussion 

WHAT IS DOCKER ABOUT? 

SOFTWARE PACKAGES COME IN DIFFERENT SHAPES AND FORMS 

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TESTING WITH DOCKER WHAT IS DOCKER? Docker containers wrap up a piece of software in a complete filesystem that contains everything it needs to run: code, runtime, system tools, system libraries – anything you can install on a server. This guarantees that it will always run the same, regardless of the environment it is running in. docker.com 

TESTING WITH DOCKER CONTAINERS > docker run mongo:latest 2015-11-01T21:43:08.287+0000 I JOURNAL [initandlisten] journal dir=/data/db/ journal 2015-11-01T21:43:08.288+0000 I JOURNAL [initandlisten] recover : no journal files present, no recovery needed 2015-11-01T21:43:08.337+0000 I JOURNAL [durability] Durability thread started … 

SHIP CONTAINERS! …and test against them 

DOCKER + TESTS 

TESTING WITH DOCKER ONE COMMAND BUILD $ sbt test nofluffjobs 

TESTING WITH DOCKER APPROACHES ▸ Writing a long “Testing setup” chapter in project’s README ▸ VMs, Vagrant ▸ Running docker outside of the build (+ Docker Compose) ▸ SBT: testOptions in Test += Tests.Setup( () => ??? ) ▸ Testing against an environment ▸ Running Docker from ScalaTest 

DOCKER-IT-SCALA 

TESTING WITH DOCKER REDIS TESTKIT "DockerRedisService" should "start a usable Redis server" in {
 val fut = redisExec { redis =>
 redis.set("foo", "bar") flatMap { _ =>
 redis.get[String]("foo")
 }
 }
 
 whenReady(fut) { resultOpt =>
 resultOpt shouldEqual Some("bar")
 }
 }
 

TESTING WITH DOCKER REDIS CONTAINER STARTUP TIME ▸ Native startup time.
 Mean 10.739ms, median: 11.131ms, stdev: 1.006ms. ▸ Docker startup time.
 Mean 262.751ms, median: 277.653ms, stdev: 29.649ms. Poor man’s benchmark [gist].
 15 runs, 5 discarded, assuming normal distribution. Late 2013 15’ MBP, Intel(R) Core(TM) i7-4960HQ CPU @ 2.60GHz, 16GiB
 Docker 1.8.3 in docker-machine running VirtualBox 4.3.32 

TESTING WITH DOCKER CASSANDRA STARTUP TIME ▸ Cassandra startup time.
 Mean 6435.166ms,
 median: 6427.594ms,
 stdev: 176.389ms. Using spotify/cassandra:latest image 

TESTING WITH DOCKER REDIS TESTKIT trait DockerRedisService extends DockerKit { val DefaultRedisPort = 6379
 
 val redisContainer = DockerContainer("redis:3.0.5")
 .withPorts(DefaultRedisPort -> None)
 .withReadyChecker( DockerReadyChecker.LogLineContains("* The server is now ready to accept connections”) )
 abstract override def dockerContainers: List[DockerContainer] = redisContainer :: super.dockerContainers
 } 

TESTING WITH DOCKER CHAIN SERVICES class MySpec extends FlatSpec with DockerElasticsearchService 
 with DockerCassandraService with DockerNeo4jService with DockerMongodbService 

TESTING WITH DOCKER FAKE-S3 implicit lazy val s3Client = {
 val clientFut = fakeS3PortFut map { port =>
 val c = new AmazonS3Client(new BasicAWSCredentials("fake", "fake"))
 c.setEndpoint(s"http://${docker.host}:$port")
 c.setS3ClientOptions(new S3ClientOptions().withPathStyleAccess(true))
 c
 }
 
 Await.result(clientFut, 30.seconds)
 } 

TESTING WITH DOCKER FUTURE WORK ▸ Tests against other µservices ▸ Early image pulling 

LET’S HAVE A DISCUSSION! 

TESTING WITH DOCKER RESOURCES ▸ docker-it-scala ▸ Integration Testing with Docker and Scala ▸ Container startup benchmark IPython notebook ▸ etaty/rediscala ▸ jubos/fake-s3