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kotlinlang

I think I found a bug. But asking here first to not report it twice

`println(message: Any?)` is not working as expected in testing

Take the bellow code for example
```println("Start")
println("End")```
Expected printed output should be
```Start
End```
Actual printed output
```StartEnd```
However, the code below
```println("Start\n")
println("End\n")```
Prints
```Start
End```
Instead of
```Start

End```
Tested on
OS: Linux
Browser: ChromeBrowser and ChromeHeadless,
Kotlin: 1.5.0, 1.5.10, 1.5.20, 1.5.21, 1.5.30-RC
Target: JS/IR

Funnier thing: if you switch the test engine (Karma/Mocha...) it's not always there