\input regression-test.tex
\IfFormatAtLeastTF{2025-06-01}
  {\DocumentMetadata{tagging=on,lang=en-US}}
  {\DocumentMetadata{testphase={phase-III,title,table,math,firstaid},lang=en-US}}
\documentclass{article}
% Simulate an already loaded package without making the suite depend on it.
\makeatletter
\expandafter\def\csname ver@pdfpages.sty\endcsname{2099/01/01 test marker}
\makeatother
\usepackage[pdfpages]{tagpax}
\begin{document}
\START
\ExplSyntaxOn
\cs_if_exist:NTF \includepdf
  {\TYPE{conflict-command=true}}
  {\TYPE{conflict-command=false}}
\cs_if_exist:NTF \tagpaxinclude
  {\TYPE{native-command=true}}
  {\TYPE{native-command=false}}
\ExplSyntaxOff
\END
\end{document}