....

The issue is actually in your code. The test code just mixes up "expected" and "actual".

So "11, 11, 2(, 3, 5\r, 8ò, =Å, E}, R\b, gK, " is not expected, it's what your code returns.

I had a very similar issue, and fixing a bug in my code helped.

I tested both ceccomilani and your solutions as well, and there are no problems.

(Maybe the author sliently fixed it.)

I just solved the kata and there are apparently no problems. Maybe you've used something weird? :)

I keep meaning to get back to investigate on this. Maybe it's time.

Read the compile errors ;-)

/home/codewarrior/fixture.cs(22,63): error CS1056: Unexpected character
/home/codewarrior/fixture.cs(22,59): error CS1644: Feature `declaration expression' cannot be used because it is not part of the C# 6.0 language specification

Also please raise code problems as a question.