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How to use SBT IntegrationTest configuration from Scala objects

To make our multi-project build more manageable, we split our Build.scala file into several files, for example. Dependencies.scala contains all the dependencies:

import sbt._

object Dependencies {
  val slf4j_api = "org.slf4j" % "slf4j-api" % "1.7.7"
  ...
}

We want to add integration tests to our assembly. After the SBT documentation we added

object Build extends sbt.Build {
  import Dependencies._
  import BuildSettings._
  import Version._
  import MergeStrategies.custom

  lazy val root = Project(
    id = "root",
    base = file("."),
    settings = buildSettings ++ Seq(Git.checkNoLocalChanges, TestReport.testReport)
  ).configs(IntegrationTest).settings(Defaults.itSettings: _*)
  ...
}

where Dependencies, BuildSettings, Version and MergeStrategies are Scala custom objects defined in their own files.

Following the documentation, we want to add some dependencies for the IntegrationTest configuration in Dependencies.scala:

import sbt._

object Dependencies {

  val slf4j_api = "org.slf4j" % "slf4j-api" % "1.7.7"

  val junit = "junit" % "junit" % "4.11" % "test,it"
...
}

Unfortunately, this destroys the assembly:

java.lang.IllegalArgumentException: 'junit # junit; 4.11' 'it' ... !

, IntegrationTest. IntegrationTest Dependencies.scala:

import sbt.Configurations.IntegrationTest

IntegrationTest - val, Configurations:

object Configurations {
  ...
  lazy val IntegrationTest = config("it") extend (Runtime)
  ...
 }

.

- , ?

+4
1

Project, Project.

, , , .

, ?

Project SBT, :

lazy val root = (project in file(".")).
  configs(IntegrationTest).

, val, , "it":

lazy val IntegrationTest = config("it") extend (Runtime)
+1

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