\DocumentMetadata{}
\input regression-test.tex
\documentclass{ltx-talk}
\usepackage{ltxtalk-theme}

\ExplSyntaxOn
\RegisterLTXTalkTheme { nav-test }
  {
    \ltxtalksetup { header = true, header-height = 1cm }
    \setltxtalkcolors { primary = { model=HTML, value=204060 } }
    \defineltxtalkslot { nt-nav } { header } { custom } { role = navigation }
    \setltxtalkslotcontent { nt-nav } { \LTXTalkNavigation { section-list } }
    \positionltxtalkslot { nt-nav } { left } { 0.2cm } { 0.9\paperwidth } { 0.5cm }
    \defineltxtalkslot { nt-cur } { header } { section } { role = navigation }
    \setltxtalkslotcontent { nt-cur } { \LTXTalkNavigation { current-section } }
    \positionltxtalkslot { nt-cur } { right } { 0.2cm } { 3cm } { 0.5cm }
  }
\ExplSyntaxOn
\useltxtalktheme { nav-test }
\ExplSyntaxOff

\begin{document}
\section{Einleitung}
\begin{frame}\frametitle{A}\end{frame}
\section{Hauptteil}
\subsection{Erster Aspekt}
\begin{frame}\frametitle{B}\end{frame}
\section{Schluss}
\begin{frame}\frametitle{C}\end{frame}

\START
\ExplSyntaxOn

% 1. The registry knows every built-in renderer.
\bool_set_true:N \l_tmpa_bool
\clist_map_inline:nn
  { current-section, current-subsection, section-list, subsection-list,
    toc, section-dots, section-progress }
  { \prop_if_in:NnF \g__ltxtalk_navigations_prop {#1}
      { \bool_set_false:N \l_tmpa_bool \TYPE { missing-renderer= #1 } } }
\bool_if:NTF \l_tmpa_bool
  { \TYPE { registry-builtin:passed } } { \TYPE { registry-builtin:FAILED } }

% 2. The section/begin and subsection/begin hooks recorded every section
%    and subsection this run (3 sections + 1 subsection = 4).
\int_compare:nNnTF { \seq_count:N \g__ltxtalk_nav_thisrun_seq } = { 4 }
  { \TYPE { thisrun-count:passed } }
  { \TYPE { thisrun-count:FAILED= \seq_count:N \g__ltxtalk_nav_thisrun_seq } }
\tl_set:Ne \l_tmpa_tl { \seq_use:Nn \g__ltxtalk_nav_thisrun_seq { || } }
\TYPE { thisrun-seq= \tl_to_str:N \l_tmpa_tl }

% 3. Using section-list marked the run as needing the collected structure.
\bool_if:NTF \g__ltxtalk_nav_structure_used_bool
  { \TYPE { structure-used:passed } } { \TYPE { structure-used:FAILED } }

% 4. The .aux was written and read back: after the first run the toc seq is
%    non-empty and matches this run (so no perpetual rerun request).
\int_compare:nNnTF { \seq_count:N \g__ltxtalk_nav_toc_seq } > { 0 }
  { \TYPE { aux-roundtrip:passed } } { \TYPE { aux-roundtrip:FAILED } }
\str_if_eq:eeTF
  { \seq_use:Nn \g__ltxtalk_nav_toc_seq { | } }
  { \seq_use:Nn \g__ltxtalk_nav_thisrun_seq { | } }
  { \TYPE { signature-stable:passed } }
  { \TYPE { signature-stable:FAILED } }

% 5. \__ltxtalk_nav_measure: counts the three sections; the current one
%    (\thesection is 3 after the last section) is at position 3.
\__ltxtalk_nav_measure:
\int_compare:nNnTF \g__ltxtalk_nav_total_int = { 3 }
  { \TYPE { measure-total:passed } }
  { \TYPE { measure-total:FAILED= \int_use:N \g__ltxtalk_nav_total_int } }
\int_compare:nNnTF \g__ltxtalk_nav_index_int = { 3 }
  { \TYPE { measure-index:passed } }
  { \TYPE { measure-index:FAILED= \int_use:N \g__ltxtalk_nav_index_int } }

% 6. The parent-section test: while mapping, the entries following the
%    current section's entry (id 3) are "in current", those following
%    another section's entry (id 2) are not.
\__ltxtalk_nav_track_init:
\__ltxtalk_nav_track:nn { 1 } { 3 }
\bool_if:NTF \g__ltxtalk_nav_in_current_bool
  { \TYPE { subsec-in-current:passed } } { \TYPE { subsec-in-current:FAILED } }
\__ltxtalk_nav_track:nn { 1 } { 2 }
\__ltxtalk_nav_track:nn { 2 } { 2.1 }
\bool_if:NTF \g__ltxtalk_nav_in_current_bool
  { \TYPE { subsec-not-in-current:FAILED } } { \TYPE { subsec-not-in-current:passed } }

\ExplSyntaxOff
\END
\end{document}