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scalamockitospecs2

are there any tricks to working with overloaded methods in specs2?

i've been getting beat up attempting to match on an overloaded method.

i'm new to scala and specs2, so that is likely one factor ;)

so i have a mock of this SchedulerDriver class

and i'm trying to verify the content of the arguments that are being passed to the signature of this launchTasks method:

http://mesos.apache.org/api/latest/java/org/apache/mesos/SchedulerDriver.html#launchTasks(java.util.Collection,%20java.util.Collection)

i have tried the answers style like so:

val mockSchedulerDriver = mock[SchedulerDriver]
mockSchedulerDriver.launchTasks(haveInterface[Collection[OfferID]], haveInterface[Collection[TaskInfo]]) answers { i => System.out.println(s"i=$i") }

and get

ambiguous reference to overloaded definition, both method launchTasks in trait SchedulerDriver of type (x$1: org.apache.mesos.Protos.OfferID, x$2: java.util.Collection[org.apache.mesos.Protos.TaskInfo])org.apache.mesos.Protos.Status and method launchTasks in trait SchedulerDriver of type (x$1: java.util.Collection[org.apache.mesos.Protos.OfferID], x$2: java.util.Collection[org.apache.mesos.Protos.TaskInfo])org.apache.mesos.Protos.Status match argument types (org.specs2.matcher.Matcher[Any],org.specs2.matcher.Matcher[Any])

and i have tried the capture style like so:

val mockSchedulerDriver = mock[SchedulerDriver]
val offerIdCollectionCaptor = capture[Collection[OfferID]]
val taskInfoCollectionCaptor = capture[Collection[TaskInfo]]
there was one(mockSchedulerDriver).launchTasks(offerIdCollectionCaptor, taskInfoCollectionCaptor)

and get:

overloaded method value launchTasks with alternatives: (x$1: org.apache.mesos.Protos.OfferID,x$2: java.util.Collection[org.apache.mesos.Protos.TaskInfo])org.apache.mesos.Protos.Status <and> (x$1: java.util.Collection[org.apache.mesos.Protos.OfferID],x$2: java.util.Collection[org.apache.mesos.Protos.TaskInfo])org.apache.mesos.Protos.Status cannot be applied to (org.specs2.mock.mockito.ArgumentCapture[java.util.Collection[mesosphere.mesos.protos.OfferID]], org.specs2.mock.mockito.ArgumentCapture[java.util.Collection[org.apache.mesos.Protos.TaskInfo]])

any guidance or suggestions on how to approach this appreciated...!

best, tony.

Solution

  • You can use the any matcher in that case:

    val mockSchedulerDriver = mock[SchedulerDriver]

mockSchedulerDriver.launchTasks(
 any[Collection[OfferID]],     
 any[Collection[TaskInfo]]) answers { i => System.out.println(s"i=$i")

    The difference is that any[T] is a Matcher[T] and the overloading resolution works in that case (whereas haveInterface is a Matcher[AnyRef] so it can't direct the overloading resolution).