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

onComplete returns Unit, so that block of code returns immediately and the test ends before being able to do anything. In order to properly test the result of a Future, you need to block until it completes. You can do so using Await, and setting a maximum Duration to wait.

import scala.concurrent._
import scala.concurrent.duration._

Await.result(testImage, Duration("10 seconds")) must not have length(0)