[英][Scala][Mokito] How to stub a Future function to throw exception
I m writing test case for stubbing a repository Future
function throws an Exception
to simulate some DB error. 我正在编写用于对存储库进行存根的测试用例, Future
函数将引发Exception
以模拟某些DB错误。
I expect the DB exception throw by Repository.create and it will be handled by Actor .recover{}
. 我期望Repository.create抛出数据库异常,它将由Actor .recover{}
处理。 But it throws an exception and cannot be caught by .recover
但这会引发异常,并且无法被.recover
捕获
// test
it should "return NOT created message if exception thrown" in {
val repository = mock[Repository]
val service = TestActorRef(props(repository))
implicit val ec: ExecutionContext = service.dispatcher
val mockTeam = mock[Team]
when(repository.create(any[Team])(same(ec))).thenReturn(Future.failed(throw new Exception))
service ! CreateTeam(mockTeam)
expectMsg(TeamNotCreated())
}
// service == actor
override def receive = {
case CreateTeam(team) => createTeam(team)
.recover {
case error: Exception => TeamNotCreated()
}.pipeTo(sender())
}
private def createTeam(team: Team)
: Future[TeamCreateEvent] = {
for {
newTeam <- repository.create(team = team)
} yield {
if (newTeam isDefined) TeamCreated(newTeam)
else TeamNotCreated()
}
}
// repository
override def create(team: TeamEntity)(implicit ec: ExecutionContext)
: Future[Option[TeamEntity]] = {
Future {
val column = Team.column
/**** I want to simulate some exception was thrown here ***/
val newId = Team.createWithNamedValues(
column.name -> team.name
)
if (newId.isValidLong) Option(team.copy(id = newId)) else None
}
}
Here is the output: 这是输出:
[info] - should return NOT created message if exception thrown *** FAILED ***
[info] java.lang.Exception:
should return updated message if collaborator team create success *** FAILED ***
[info] org.mockito.exceptions.misusing.UnfinishedStubbingException:
Unfinished stubbing detected here:
.g. thenReturn() may be missing.
[info] Examples of correct stubbing:
[info] when(mock.isOk()).thenReturn(true);
[info] when(mock.isOk()).thenThrow(exception);
[info] doThrow(exception).when(mock).someVoidMethod();
[info] Hints:
[info] 1. missing thenReturn()
[info] 2. you are trying to stub a final method, you naughty developer!
[info] 3: you are stubbing the behaviour of another mock inside before 'thenReturn' instruction if completed
I had tried to to replace thenReturn(Future.failed..
with thenThrow(new Exception)
but not working with error ava.lang.AssertionError: assertion failed: timeout (3 seconds) during expectMsg while waiting for
我试图用thenThrow(new Exception)
替换thenReturn(Future.failed..
thenThrow(new Exception)
但无法处理错误ava.lang.AssertionError: assertion failed: timeout (3 seconds) during expectMsg while waiting for
You don't want to throw the Exception inside the Future.failed
, just create it there. 您不想将Exception 抛出到Future.failed
内部,只需在其中创建它即可。 What happens in a call to a real repository is that an Exception is thrown in the calculation of the Future
's result, and this would then be caught and placed in a Failure
instance, rather than a successful calculation result being placed in a Success
instance. 调用真实存储库时发生的情况是,在计算 Future
的结果时引发了异常,然后将其捕获并放置在Failure
实例中,而不是将成功的计算结果放置在Success
实例中。 So: 所以:
when(repository.create(any[Team])(same(ec))).thenReturn(Future.failed(new Exception(...)))
should do the job. 应该做的工作。
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