How to test methods that return Future?

Question

I\'d like to test a method that returns a Future. My attempts were as follows:

import  org.specs2.mutable.Specification
import scala.concurrent.Exec         


        

Answer 1

Wondering why @etorreborre did not mention "eventually"

See https://github.com/etorreborre/specs2/blob/master/tests/src/test/scala/org/specs2/matcher/EventuallyMatchersSpec.scala#L10-L43

class EventuallyMatchersSpec extends Specification with FutureMatchers with ExpectationsDescription { section("travis")
addParagraph { """
`eventually` can be used to retry any matcher until a maximum number of times is reached
or until it succeeds.
""" }

  "A matcher can match right away with eventually" in {
    1 must eventually(be_==(1))
  }
  "A matcher can match right away with eventually, even if negated" in {
    "1" must not (beNull.eventually)
  }
  "A matcher will be retried automatically until it matches" in {
    val iterator = List(1, 2, 3).iterator
    iterator.next must be_==(3).eventually
  }
  "A matcher can work with eventually and be_== but a type annotation is necessary or a be_=== matcher" in {
    val option: Option[Int] = Some(3)
    option must be_==(Some(3)).eventually
  }