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以下问题的答案:https://stackoverflow.com/a/30806548/4496364 我在我的项目中使用了Play的ExecutionContext。Scala,PlayFramework,Mockito,ExecutionContext null
最近我需要使用Mockito测试Play中的一些服务。 所以,这是简化的版本,它:
import scala.concurrent.{ Future, ExecutionContext }
import play.api.libs.concurrent.Execution.Implicits.defaultContext
case class Model(id: Int, name: String)
trait DAO {
def findAll(implicit ec: ExecutionContext): Future[List[Model]]
}
class Service(dao: DAO) {
def findAll: Future[List[Model]] = dao.findAll
}
测试:
import play.api.libs.concurrent.Execution.Implicits.defaultContext
// doesn't work when different ExecutionContext
// import scala.concurrent.ExecutionContext.Implicits.global
class FuturesTest extends PlaySpec with MockitoSugar with ScalaFutures {
"Service" should {
"return all future data" in {
val mockModel = Model(1, "name")
val mockDAO = mock[DAO]
when(mockDAO.findAll) thenReturn Future.successful(List(mockModel))
val service = new Service(mockDAO)
val futureData = service.findAll
whenReady(futureData) { data =>
data.map(_.name) must contain(mockModel.name)
}
}
}
}
注意,在测试的评论,我得到一个NullPointException
在Service
调用dao.findAll
时。起初我认为Mockito无法处理Scala的期货,但我发现ExecutionContext
是问题所在。由于我不是并发专家,有人可以解释为什么会发生这种情况吗?
也许这可能不是一个问题与ExecutionContext,但与'trait'?http://stackoverflow.com/questions/6243467/scala-and-mockito-with-traits?rq = 1 –