Add test cases for MUFI ligatures encoded with Zero-Width Joiners
Add test cases for MUFI ligatures encoded with Zero-Width Joiners

https://github.com/googlefonts/noto-fonts/issues/704

googlefonts/noto-source,googlefonts/noto-source,googlefonts/noto-source,googlei18n/noto-source,googlei18n/noto-source,googlei18n/noto-source