
\documentclass{testsuite}
\usepackage{fontspec}
\setmainfont[Ligatures=TeX]{TeX Gyre Pagella}
\begin{document}
Hello, moon!\par
\textsc{small caps}\par
`--Punctuation---'

\def\itdefault{sl}
\setmainfont{Verdana}
Testing \textsl{slanted} edge case.
\end{document}