We do want to test for just embedded newlines, so I think we might as well remove any other additional characters. The old test contains embedded spaces as well, so the old csv-parser only appeared to support embedded newlines.

I had an extra notes in the commit message, but it doesn't appear to show up in many places on the github UI:

"The originally test case had to be amended as it only happened to work
due to the presence of embedded spaces."