Is there some documentation on how to inspect a `CoroutineScope` / `CoroutineContext`? I would I un...

# getting-started

[Daniele Segato]

Is there some documentation on how to inspect a CoroutineScope / CoroutineContext?

I would I unit test this function?

fun createCoroutineScope(): CoroutineScope = CoroutineScope(SupervisorJob() + Dispatchers.Default)

So in my test I have to check if the returned CoroutineScope is using a SupervisedJob or a particular Dispatcher how do I do that??
(or any other property of the context/scope)

[diesieben07]

A CoroutineContext is basically a type-safe map, the keys are CoroutineContext.Key.
In your example scope.coroutineContext[Job] would give you the SupervisorJob (because Job has a companion object which is the CoroutineContext.Key); scope.coroutineContext[CoroutineDispatcher] will give you Dispatchers.Default in the same way.

[Daniele Segato]

thanks @diesieben07 where do I find a list of keys? I tried to make Intellij tell me but failed

[diesieben07]

"Show type hierarchy" (Ctrl-H) on CoroutineContext.Key does it for me. I can't find that in the menus though, I always just use the shortcut 😄

[Daniele Segato]

oh, for some reason I didn't though of using CoroutineContext.Key hierarchy....

btw you can find it if you do Ctrl+Shift+A and look for type hierarchy

[Daniele Segato]

hum by the way I can get the job with scope.coroutineContext[Job] but than I do not know how to check it's a SupervisorJob.

it's not a class, it's a top level function and the implementation is private