% Minimal test for Adagio Slab
\documentclass{article}
\usepackage{fontspec}
\defaultfontfeatures{Ligatures=TeX}
\setmainfont[Path=fonts/PW_Adagio_Slab/,UprightFont=Adagio_Slab-Regular.otf,ItalicFont=Adagio_Slab-Regular_italic.otf,BoldFont=Adagio_Slab-Bold.otf,BoldItalicFont=Adagio_Slab-Bold_italic.otf]{Adagio Slab}
\begin{document}
This is a test: Zażółć gęślą jaźń -- bold and italic.
\textbf{Bold text.} \textit{Italic text.}
\end{document}