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%
\newbox\cals@current@row % To be removed after defined in cals.sty
%
\def\mkcurrow#1{\setbox\cals@current@row=\vbox to #1{a\vfil}%
  \ht\cals@current@row=#1\relax}
%\def\mkbakrow#1{\setbox\cals@backup@row=\vbox to #1{a\vfil}}
\def\mkfoot#1{\def\cals@tfoot@tokens{aaa}\def\cals@tfoot@height{#1}}
\def\rmfoot{\let\cals@tfoot@tokens=\relax}

\def\ok{\PackageInfo{test}{OK}}
\def\fail{\PackageInfo{test}{FAIL}}

\let\cals@tbreak@tokens=\relax

%
% 1: Body, no break
%
\def\pagegoal{400pt}
\def\pagetotal{300pt}
\mkfoot{50pt}
\mkcurrow{50pt}
\let\cals@last@context=b
\let\cals@current@context=b
\cals@ifbreak\iftrue \fail \else \ok \fi

%
% 2: Body, break
%
\mkcurrow{60pt}
\cals@ifbreak\iftrue \ok \else \fail \fi

%
% 3: No break in head or foot
%
\let\cals@current@context=h
\cals@ifbreak\iftrue \fail \else \ok \fi
\let\cals@current@context=f
\cals@ifbreak\iftrue \fail \else \ok \fi
\let\cals@current@context=b

%
% 4: No break after the header
%
\let\cals@current@context=b
\cals@ifbreak\iftrue \ok \else \fail \fi
\let\cals@last@context=h
\cals@ifbreak\iftrue \fail \else \ok \fi

%
% 5: User forces a break
%
\tbreak{ok}
\cals@ifbreak\iftrue \ok \else \fail \fi