Trying to reproduce https://github.com/scala-js/scala-js/issues/3218 (no luck so far)

build.sbt

enablePlugins(ScalaJSPlugin)

scalaVersion := "2.12.4"

scalaJSUseMainModuleInitializer in Test := true
scalaJSModuleKind := ModuleKind.CommonJSModule

project__build.properties

sbt.version=0.13.16

project__plugins.sbt

addSbtPlugin("org.scala-js" % "sbt-scalajs" % "0.6.21")

src__test__scala__TmpApp.scala

object TmpApp {
  def main(args: Array[String]): Unit = {
    println("asdf")
  }
}