mockito scala中的模拟case类

我有个特点

trait Writer[T <: Attribute] {
  def read(boundingBox: BoundingBox): Future[List[T]]
}

和一个case类

case class WriterImpl[T <: Attribute]()(implicit manifest: Manifest[T]) extends Writer[T] with LazyLogging {

override def read(boundingBox: BoundingBox): Future[List[T]] = {
}
..
}

在Test类中，我想模拟方法read（）
我用精确值试过了

val writer = mock[WriterImpl[Attrib]]
        when(writer.read(new BoundingBox(41.90178412, 41.8798685, -87.62687021, -87.64884287)))
          .thenReturn(Future.successful(scala.collection.immutable.List(list)))

 verify(writer).read(new BoundingBox(41.90178412, 41.8798685, -87.62687021, -87.64884287))

也尝试了

val writer = mock[WriterImpl[Attrib]]
            when(writer.read(ArgumentMatchers.any()))
              .thenReturn(Future.successful(scala.collection.immutable.List(list)))

     verify(writer).read(ArgumentMatchers.any())

它调用的不是mock方法，而是实际方法

在第一个范例中，问题是您使用两个不同的BoundingBox对象做为read方法的参数：一个用于when，另一个用于verify。它们不会匹配，因为在运行时它们是同一个BoundingBox类的不同示例。您应该使用同一个对象。将它存储在when子句之前，然后调用verify并传递同一个对象。
我假设您刚刚删除了when和verify子句之间任何地方对writer.read(...)的明显调用。verify至少需要一个对read的调用，否则将抛出"Wanted but not invoked: writerImpl.read(...); Actually, there were zero interactions with this mock.."
第二个示例应该可以运行，但是如果您尝试检查结果，仍然会遇到相同的问题。一个在when中，另一个在verify中。由于它们在运行时是两个不同的对象，因此它们将不匹配：

result shouldBe Future.successful(scala.collection.immutable.List(new Attribute))

该输出确认运行时看到2个不同的示例：

Expected :Future(Success(List(org.scala.snippets.Test$Attribute@373052b5)))
Actual   :Future(Success(List(org.scala.snippets.Test$Attribute@17207f5b)))

同样，只需将Future存储在when之前，并将相同的Future传递给when和shouldBe。通过这些调整，这应该可以工作。检查read的结果，确认从调用中返回了相同的Future：

import Test.{Attribute, BoundingBox, WriterImpl}

import org.mockito.MockitoSugar
import org.scalatest.matchers.should.Matchers
import org.scalatest.wordspec.AnyWordSpec

import scala.concurrent.Future

class ProgramTest extends AnyWordSpec with MockitoSugar with Matchers {
  "Program " should {
    "return the mocked succf " in {
      val succf  = Future.successful(scala.collection.immutable.List(new Attribute))
      val bb     = new BoundingBox(41.90178412, 41.8798685, -87.62687021, -87.64884287)
      val writer = mock[WriterImpl[Attribute]]
      when(writer.read(bb)).thenReturn(succf)

      val result = writer.read(bb)

      verify(writer, times(1)).read(bb)
      result shouldBe succf
    }
  }
}

这是我的build.sbt，如果您需要的话：

libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.12" % Test
libraryDependencies += "org.scalatestplus" %% "scalacheck-1-16" % "3.2.12.0" % Test
libraryDependencies += "org.scalatestplus" %% "mockito-4-5" % "3.2.12.0" % Test
libraryDependencies += "org.mockito" % "mockito-core" % "4.6.1" % Test
libraryDependencies += "org.mockito" %% "mockito-scala" % "1.17.7" % Test

mockito scala中的模拟case类

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