sbt/project/NightlyPlugin.scala

import sbt.*
import Keys.*
import Dependencies.*

object NightlyPlugin extends AutoPlugin:
  override def trigger = allRequirements
  override def requires = plugins.JvmPlugin

  object autoImport:
    val includeTestDependencies = settingKey[Boolean]("Doesn't declare test dependencies.")

    def testDependencies = libraryDependencies ++= (
      if includeTestDependencies.value then
        Seq(
          scalacheck % Test,
          junit % Test,
          scalaVerify % Test,
          hedgehog % Test
        ) ++ scalatest
      else Seq()
    )
  import autoImport.*

  override def buildSettings: Seq[Setting[?]] = Seq(
    includeTestDependencies := true
  )

  override def projectSettings: Seq[Setting[?]] = Seq(
  )
end NightlyPlugin