After learning that just using this mouse was not the greatest way of
figuring out whether or not the iconv helpers worked, I decided to
write a few simple tests to ensure silly things like this don't happen
again.
Changes since v1:
- fix indentation
- Fix year in copyright on test-iconv-helper.c
- Use an encoding that's definitely invalid for the
iconv_invalid_encoding test
- Add tests for a bunch of bad utf16le strings
- Add tests for converting emojis to/from utf16le. Just so we have some
actually multibyte characters in here.
