Organising Scala Tests In SBT

sbt.scala

#########################################
#### Inside project/E2E.class object ####
#########################################

import sbt.{Configuration, Defaults, Test, inConfig}
import sbt._
import sbt.Keys._

object E2E {
  final val E2ETest = Configuration.of("EndToEndTest", "e2e") extend (Test)

  final val e2eSettings =
    inConfig(E2ETest)(e2eConfig)

  lazy val e2eConfig = Defaults.configSettings ++ Defaults.testTasks ++ Seq(
    scalaSource in E2ETest := baseDirectory.value / "src" / "e2e" / "scala",
    javaSource in E2ETest := baseDirectory.value / "src" / "e2e" / "java",
    resourceDirectory in E2ETest := baseDirectory.value / "src" / "e2e" / "resources",
    E2ETest / parallelExecution := false
  )

}

===================
###################
#### build.sbt ####
###################
import E2E._

lazy val scalatest = "org.scalatest" % "scalatest_2.11" % "3.0.5"

lazy val module1 = (project in file("module1"))
  .configs(IntegrationTest)
  .configs(E2ETest)
.settings(
  E2E.e2eSettings,
  Defaults.itSettings,
  libraryDependencies += scalatest % "it,test,e2e",
    name := "module1",
  version := "0.1"
)

lazy val module2 = (project in file("module2"))
  .configs(IntegrationTest)
  .configs(E2ETest)
  .settings(
    Defaults.itSettings,
    libraryDependencies += scalatest % "it,test,e2e",
      E2E.e2eSettings,
    name := "module2",
    version := "0.1"
  )

lazy val root = (project in file("."))
  .configs(IntegrationTest)
  .configs(E2ETest)
  .aggregate(module1, module2)
  .enablePlugins(Common)
  .settings(
    E2E.e2eSettings,
    Defaults.itSettings,
    libraryDependencies += scalatest % "it,test,e2e"
  )