Comment by gordaco

Ha, this is one of the reasons why I also include outlandish and wrong-looking stuff in unit tests. If we see where it doesn't belong, then we know for sure that we are doing something wrong.

Most often I use unicode strings in unexpected alphabets (i.e. from languages that are not supported by our application and that are not used by the mother tongue of any developer from our team). This includes Chinese, Malayalam, Arabic and a few more. There was a time when I wanted to test the "wrong data" cases for some deserialising function, and I was part annoyed and part amusingly surprised to discover that doing Integer.parseInt("٤٣٠٤٦٧٢١") in Java does parse the arabic digits correctly even without specifying any locale.