期待Scalamock中mock的特定实例

Question

为什么我不能告诉mock它应该期望一个类的实例而不显式地给出类型?我的意思是:

val myClass = new MyClass(...)
val traitMock = mock[MyTrait]
(traitMock.mymethod _).expects(myClass).returning(12.3)

不工作，而

val myClass: MyClass = new MyClass(...)
val traitMock = mock[MyTrait]
(traitMock.mymethod _).expects(myClass).returning(12.3)

工作。为什么不能推断类型?

我在build.sbt中的测试部分是

libraryDependencies ++= Seq(
  "org.scalatest" %% "scalatest" % "3.0.0" % "test"
    exclude("org.scala-lang", "scala-reflect")
    exclude("org.scala-lang.modules", "scala-xml")
)
libraryDependencies += "org.scalamock" %% "scalamock-scalatest-support" % "3.3.0" % "test"

因为我被要求MyClass(这里是SpacePoint):

trait SpacePoint {
  val location: SpaceLocation
}
val sp = new SpacePoint {
  override val location: SpaceLocation = new SpaceLocation(DenseVector(1.0, 1.0))
}

Answer 1

所以实际上它为我工作。让我提一下代码中的类型推断:

val myClass = new MyClass(...)

与ScalaMock无关，但由scala本身保证。下面我将指定带有库版本和类源的工作示例。

测试库:

"org.scalatest" %% "scalatest" % "2.2.4" % "test",
"org.scalamock" %% "scalamock-scalatest-support" % "3.2.2" % "test"

类的源代码:

class MyClass(val something: String)
trait MyTrait {
  def mymethod(smth: MyClass): Double
}

测试源代码:

import org.scalamock.scalatest.MockFactory
import org.scalatest.{Matchers, WordSpec}
class ScalamockTest extends WordSpec with MockFactory with Matchers {
  "ScalaMock" should {
    "infers type" in {
      val myClass = new MyClass("Hello")
      val traitMock = mock[MyTrait]
      (traitMock.mymethod _).expects(myClass).returning(12.3)
      traitMock.mymethod(myClass) shouldBe 12.3
    }
  }
}

希望有帮助。一旦您提供更多细节，我们将准备更新答案。