I use `runTest()` and I got this error: ```Caused by: kotlinx.coroutines.TimeoutCancellationExceptio...

# coroutines

[Norbi]

I use runTest() and I got this error:

Caused by: kotlinx.coroutines.TimeoutCancellationException: Timed out after 10m of _virtual_ (kotlinx.coroutines.test) time. To use the real time, wrap 'withTimeout' in 'withContext(Dispatchers.Default.limitedParallelism(1))'

I was wondering why limitedParallelism(1) is necessary, and how my test would behave without it?
Thanks.

[ephemient]

test dispatcher is single-threaded for repeatable tests. if you don't care about that, you don't need limitedParallelism(1) either