Amiri + SILE shaping test

ss.sil

\begin{document}
\set[parameter=document.baselineskip,value=3em]
\font[language=ar,size=30pt,family=Amiri]
\define[command=ss01]{\font[features=+ss01]{\process}}
\define[command=ss02]{\font[features=+ss02]{\process}}
\define[command=ss03]{\font[features=+ss03]{\process}}
\define[command=ss04]{\font[features=+ss04]{\process}}
\define[command=ss05]{\font[features=+ss05]{\process}}
\noindent
ربِّها\break
\ss01{ربِّها}\break
\ss02{ربِّها}\break
\ss03{ربِّها}\break
\ss04{ربِّها}\break
\ss05{ربِّها}\break
ربِّ\ss01{\ss05{ه}ا}\break
\end{document}