%% test-ptex-show.tex
%% ==================
%% Patch-status check for (u)pLaTeX (inspect the log, not the typeset
%% output).
%%
%%   platex  -interaction=nonstopmode test-ptex-show.tex
%%   uplatex -interaction=nonstopmode test-ptex-show.tex
%%
%% What to check in the log:
%%   * footnotenosplit-ptex is loaded.
%%   * The \meaning after ===MAKECOL=== contains the branch
%%       \ifdim \ht \footins <\footnotesep \fns@discard@emptyfootins \else
%%     and the matching extra \fi \fi.
%%   * The \meaning after ===FOOTNOTETEXT=== contains
%%       \splittopskip \dimexpr \footnotesep +\footnotetopkern
%%   * ===IFP===10000 (\interfootnotelinepenalty=\@M)
%%   * No "Failed to patch" warnings.
%%
%% The class is selected automatically (platex: jbook / uplatex: ujbook).
%% Since current pLaTeX also runs on the e-upTeX engine, the format is
%% detected via the internal kanji encoding.
\ifnum\jis"2121="3000
  \documentclass{ujbook}
\else
  \documentclass{jbook}
\fi
\usepackage{footnotenosplit}
\begin{document}
\makeatletter
\typeout{===MAKECOL===^^J\meaning\@makecol^^J===FOOTNOTETEXT===^^J\meaning\@footnotetext^^J===IFP===\the\interfootnotelinepenalty===END===}
\makeatother
test\footnote{footnote}
\end{document}