Scala 模拟，MockFactory 预计会因“意外调用”而失败

Question

我想按照这个文档-scalatest用scala-mock嘲笑的功能并检查它是否已被称为

class AggregateSpec extends FlatSpec with Matchers with MockFactory {

 val data = Seq("This", "is", "something", "I", "would", "like", "to", "know")

"combop function" should "BE called for par collection" in {

    val mockCombop = mockFunction[Int, Int, Int]

    val parData = data.par

    val result: Int = parData.aggregate(0)(
      seqop = (acc, next) => acc + next.length,
      combop = mockCombop
    )

    result should === (31)
    mockCombop.expects(*, *).atLeastOnce()

  }
}

结果：

> [info] - should BE called for non-par collection *** FAILED *** [info]
> Unexpected call: MockFunction2-1(4, 2) [info]    [info]   Expected:
> [info]   inAnyOrder { [info]    [info]   } [info]    [info]   Actual:
> [info]     MockFunction2-1(9, 1) [info]     MockFunction2-1(2, 4)
> [info]     MockFunction2-1(4, 2) [info]     MockFunction2-1(5, 4)
> (Option.scala:121)

为什么？如何让它通过 scalatest + scala-mock ？

——

作为 deps 我使用：

   libraryDependencies += "org.scalactic" %% "scalactic" % "3.0.1",
    libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.1" % "test",
    libraryDependencies += "org.scalamock" %% "scalamock-scalatest-support" % "3.5.0"

Answer 1

您需要mockCombop.expects在mockCombop被调用之前调用，而不是之后调用：

"combop function" should "BE called for par collection" in {
  val mockCombop = mockFunction[Int, Int, Int]

  val parData = data.par

  mockCombop.expects(*, *).atLeastOnce()

  val result: Int = parData.aggregate(0)(
    seqop = (acc, next) => acc + next.length,
    combop = mockCombop
  )

  result should === (31)
}