For most dispatchers (Main, IO, Default) it's pret...

# coroutines

[Jelle Fresen [G]]

For most dispatchers (Main, IO, Default) it's pretty straightforward to tell on which thread they will dispatch, but I can't find much about on which thread a StandardTestDispatcher is dispatched. If I call testDispatcher.scheduler.runCurrent() , on which thread are the tasks run?

[Dmitry Khalanskiy [JB]]

runCurrent() will itself run them.

[Jelle Fresen [G]]

Aah, as in it doesn't switch threads, it will stay on the calling thread

[Dmitry Khalanskiy [JB]]

Basically, yes. runCurrent executes the pending tasks for StandardTestDispatcher inline, it doesn't ask any other thread to do it.

[Jelle Fresen [G]]

Thanks for clarifying

[Dmitry Khalanskiy [JB]]

Also, using runCurrent is not recommended: https://github.com/Kotlin/kotlinx.coroutines/issues/3919

[Dmitry Khalanskiy [JB]]

Without runCurrent, runTest will execute the pending tasks, so the main test thread runs them.