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kotlinlang

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.

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