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以下問題的答案:https://stackoverflow.com/a/30806548/4496364 我在我的項目中使用了Play的ExecutionContext。Scala,PlayFramework,Mockito,ExecutionContext null
最近我需要使用Mockito測試Play中的一些服務。 所以,這是簡化的版本,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
}
測試:
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,在測試的評論,我得到一個NullPointException
在Service
調用dao.findAll
時。起初我認爲Mockito無法處理Scala的期貨,但我發現ExecutionContext
是問題所在。由於我不是併發專家,有人可以解釋爲什麼會發生這種情況嗎?
也許這可能不是一個問題與ExecutionContext,但與'trait'?http://stackoverflow.com/questions/6243467/scala-and-mockito-with-traits?rq = 1 –