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AsyncFeatureSpec list of Assertions

5 replies on 1 page. Most recent reply: Feb 1, 2017 4:36 AM by Carvel Baus

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Carvel Baus

Posts: 4
Nickname: carvel
Registered: Jan, 2017

AsyncFeatureSpec list of Assertions

Posted: Jan 30, 2017 11:28 AM

I am trying the following:


scenario("test multiple futury things") {

val futureChanges = someService.doSomethingFutury(List(somethings))

futureChanges.map { changes =>
     changes.map { change => assert(change.contains("someString")) }
     }
}

The issue is that the scenario expects a single Future[Assertion] but I have a List[Future[Assertions]] in this case.

Is it possible to test each item in the list indiviually within a single scenario?

Bill Venners

Posts: 2284
Nickname: bv
Registered: Jan, 2002

Re: AsyncFeatureSpec list of Assertions

Posted: Jan 30, 2017 12:02 PM

Sorry can you clarify what the types are by putting a type annotation on the futureChanges val?

Carvel Baus

Posts: 4
Nickname: carvel
Registered: Jan, 2017

Re: AsyncFeatureSpec list of Assertions

Posted: Jan 30, 2017 12:38 PM

Apologies...


scenario("test multiple futury things") {

val futureChanges:List[Future[String]] = someService.doSomethingFutury(List(somethings))

futureChanges.map { changes =>
     changes.map { change => assert(change.contains("someString")) }
     }
}

Carvel Baus

Posts: 4
Nickname: carvel
Registered: Jan, 2017

Re: AsyncFeatureSpec list of Assertions

Posted: Jan 30, 2017 2:22 PM

I stumbled across the "succeed" val which I was able to place at the end of the scenario and make the compiler happy. This just seemed less than eloquent, although it effectively worked.

The test does fail if any Future does not resolve as successful.

Bill Venners

Posts: 2284
Nickname: bv
Registered: Jan, 2002

Re: AsyncFeatureSpec list of Assertions

Posted: Jan 30, 2017 7:06 PM

If you put succeed at the end, I think the test will always succeed. Succeed means succeed. So I'm not sure why you would see the test failing, but regardless I don't think it is doing what you think it is doing.

Regardless, what I'd suggest is to take your List[Future[String]] and change that to a Future[List[String]], like this:


val listOFutureChanges: List[Future[String]] =
       someService.doSomethingFutury(List(somethings))

val futureListOfChanges: Future[List[String]] =
       Future.sequence(listOfFutureChanges)

Then can map an assertion about the list of changes onto that single outer future, like this:


import org.scalatest.Inspectors._

futureListOfChanges map { changes =>
    forAll (changes) { change => 
        assert(change.contains("someString"))
    }
}

Carvel Baus

Posts: 4
Nickname: carvel
Registered: Jan, 2017

Re: AsyncFeatureSpec list of Assertions

Posted: Feb 1, 2017 4:36 AM

Thanks Bill, that helped a lot.

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