请在下面找到示例源代码,该代码返回:-
package tryeg
import scala.util._
/**
* Created by mogli on 6/6/17.
*/
class TrySample(val service : TryService) {
def homePageForUser(userId: String, secret: String): Try[Page] = {
val tryhomepage = for {
user <- service.authenticate(userId, secret)
homePage <- service.fetchHomePage(user)
} yield homePage
tryhomepage match {
case Failure(e: ServiceUnavailableException) =>
e.service match{
case "AuthService" =>
Try(WebsiteHomePage)
case "PageService" =>
Try(DefaultHomePage)
case _ =>
Try(ErrorPage)
}
case _ =>
tryhomepage
}
}
}
case class User(id: Long)
case class Page(title: String, content: String)
object DefaultHomePage extends Page("Welcome!", "This is your amazing Homepage!")
object WebsiteHomePage extends Page("Welcome!", "This is your amazing website")
object ErrorPage extends Page("Sorry!", "Unhandled Erro")
sealed class MyException(msg: String) extends Exception(msg, null)
case class UnknownUserException(userId: Long) extends MyException(s"User with id [$userId] is unknown.")
case class WrongSecretException(userId: Long) extends MyException(s"User with id [$userId] provided the wrong secret.")
case class ServiceUnavailableException(service: String) extends MyException(s"The Service [$service] is currently unavailable")
trait TryService {
def authenticate(userId: String, secret: String): Try[User]
def fetchHomePage(user: User): Try[Page]
}
另外,在样本单元测试用例下面找到:
package tryeg
import org.junit.runner.RunWith
import org.scalamock.scalatest.MockFactory
import org.scalatest.FlatSpecLike
import org.scalatest.junit.JUnitRunner
import scala.util.Try
/**
* Created by mogli on 6/6/17.
*/
@RunWith(classOf[JUnitRunner])
class TrySampleTest extends FlatSpecLike with MockFactory{
val user = User(123)
val tryuser = Try(user)
val userpage = Page("jbaba", "jbaba ka page")
val tryuserpage = Try(userpage)
"non happy path with authentication service not available" should "return website page" in {
val service = stub[TryService]
( service.authenticate(_, _) ).when("123", "secret") throws ServiceUnavailableException("AuthService")
val trySample = new TrySample(service)
val page = trySample.homePageForUser("123", "secret")
//page should be (Try(WebsiteHomePage))
println("non happy path for authentication service down ")
}
"non happy path with page service not available" should "return default home page" in {
val service = stub[TryService]
( service.authenticate(_, _) ).when("123", "secret") returns (tryuser)
( service.fetchHomePage(_) ).when(user) throws ServiceUnavailableException("PageService")
val trySample = new TrySample(service)
val page = trySample.homePageForUser("123", "secret")
//page should be (Try(DefaultHomePage))
println("non happy path for page service down ")
}
}
现在,第一个测试用例抛出以下异常,但预期结果是Try(WebsiteHomePage)
tryeg.ServiceUnavailableException: The Service [AuthService] is currently unavailable
at tryeg.TrySampleTest$$anonfun$1.apply$mcV$sp(TrySampleTest.scala:31)
at tryeg.TrySampleTest$$anonfun$1.apply(TrySampleTest.scala:29)
at tryeg.TrySampleTest$$anonfun$1.apply(TrySampleTest.scala:29)
最佳答案
您的TryService
存根会引发异常,而不是返回Failure
。
关于scala - 方法引发异常,而不是返回Try in进行理解,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/44425098/