scala - ScalaMock が特性をモックすると、「MockFunction1 は StubFunction1 にキャストできません」

Question

次のコード:

import org.scalamock.scalatest.MockFactory
import org.scalatest.FlatSpec

trait SomeTrait {
  def getLongByInt(int: Int): Long
}

class TestScalaMock extends FlatSpec with MockFactory {
  "Scala Mock" should "mock my trait" in {
    val someTrait = mock[SomeTrait]
    (someTrait.getLongByInt _) when (1) returns 2L
    assert(2L == someTrait.getLongByInt(1))
  }
}

実行時エラーが発生しますorg.scalamock.MockFunction1 cannot be cast to org.scalamock.StubFunction1。私のプロジェクトの依存関係は次のとおりです。

scalaVersion := "2.11.0"

libraryDependencies ++= Seq(
  "com.typesafe.akka" %% "akka-actor" % "2.3.7",
  "com.typesafe.akka" %% "akka-testkit" % "2.3.7",
  "org.scalatest" % "scalatest_2.11" % "2.2.1" % "test",
  "org.scalamock" %% "scalamock-scalatest-support" % "3.2" % "test"
  )

何か案は？ありがとう！