the

GlobalScope.async { "testCarId" }

part seems weird to me I tried

returns  "testCarId"

but I'm getting an incompatible type error

It is hard to understand what you are trying to achieve.

yep

parseCarAsync()

is just an async function that returns a string

parseCarAsync(test1: String, test2: String) = GlobalScope.async{ 

// make expensive network call here

//return@async  return some string here
}

So the type is actually Deferred

Thanks @oleksiyp,

GlobalScope.async { "something" }

syntax just looks weird, why can't I just return Deferred("testCardId") or use any subclass that extends Deferred

Up to you, but this out of scope of mocking framework

Thanks @oleksiyp