Is there some documentation on how to inspect a `CoroutineSc kotlinlang #getting-started

Is there some documentation on how to inspect a `C...

Daniele Segato

01/22/2021, 10:13 AM

Is there some documentation on how to inspect a

CoroutineScope

CoroutineContext

? I would I unit test this function?

Copy code

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

01/22/2021, 10:18 AM

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

01/22/2021, 10:19 AM

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

diesieben07

01/22/2021, 10:20 AM

"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

01/22/2021, 12:00 PM

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

01/22/2021, 12:03 PM

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

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