AWS unit tests with localstack and scalatest

ExampleSpec.scala

import cloud.localstack.docker.annotation.LocalstackDockerProperties
import cloud.localstack.TestUtils
import org.scalatest.{BeforeAndAfterEach, FlatSpec}
import ...LocalstackSpec

@LocalstackDockerProperties(services = Array("s3"))
class ExampleSpec 
      extends FlatSpec 
      with    BeforeAndAfterEach 
      with    LocalStackSpec {
  override def beforeEach() = localstackStart()
  override def afterEach()  = localstackStop()
  
  "s3 access" should "work" in {
    // access s3 API @ localhost
    val s3 = TestUtils.getClientS3
    s3.putObject(...)
  }
}    

LocalstackSpec.scala

import cloud.localstack.Localstack
import cloud.localstack.docker.annotation.LocalstackDockerAnnotationProcessor

trait LocalstackSpec {

  def localstackStart() = {
    val config = LocalstackSpec.processor.process(this.getClass)
    Localstack.INSTANCE.startup(config)
  }

  def localstackStop() = Localstack.INSTANCE.stop()
}

object LocalstackSpec {
  val processor = new LocalstackDockerAnnotationProcessor
}