Update TestResultTests.cs

It's maybe a good idea to test also the escaping of a binary zero.
When using \u000a\u000d which is a LF\CR it results in two CR/LF pairs in the string on my Win7 machine, so we better use CR\LF
It's maybe better to use a surrogate pair with a higher codepoint, 0x1F648 is the see-no-evil-monkey that can even be shown when installing the Symbola613.ttf font.