run_dockercompose_before_tests_with_custom_Setting.scala

lazy val myProject = 
  (project in file("myProject"))
  .enablePlugins(DockerPlugin, DockerComposePlugin)
  .config(DockerTest)
  .settings(inConfig(DockerTest)(Defaults.testTasks): _*)
  .settings(testOptions in DockerTest := Seq(Tests.Argument(TestFrameworks.Specs2, "include",
    "DockerComposeTag")))
  // We exclude in other tests
  .settings(testOptions in Test := Seq(
    Tests.Argument(TestFrameworks.Specs2, "exclude", "DockerComposeTag"))
  )
  // Add the settings into the project before it is being used.
  .settings(DockerUtil.settings)
  .settings((test in DockerTest) := {
     DockerUtil.dockerComposeDown.dependsOn(test in DockerTest).dependsOn(DockerUtil.dockerComposeUp).value
  })