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

You can use the Matcher.await method to transform a Matcher[T] into a Matcher[Future[T]]:

val testImage: Future[String] =
   AsyncWebClient.get("https://www.google.cz/images/srpr/logo11ww.png")  

// you must specify size[String] here to help type inference
testImage must not have size[String](0).await

// you can also specify a number of retries and duration between retries
testImage must not have size[String](0).await(retries = 2, timeout = 2.seconds)

// you might also want to check exceptions in case of a failure
testImage must throwAn[Exception].await