\input regression-test.tex
\documentclass{article}
\usepackage[
  labels={high=URGENT,medium=NORMAL}
]{kanban-board}
\kbset{labels={low=ROUTINE,done=FINISHED}}
\kbdefinepalette*{contrast}{kanbanSlate/white,kanbanMed/kanbanInk}
\begin{document}
\sbox0{\scriptsize $x$}% Load math font sizes outside captured output.
\START
\makeatletter
\ifdefstring{\kanban@highlabel}{URGENT}
  {\TYPE{KANBAN GLOBAL HIGH LABEL OK}}
  {\TYPE{KANBAN GLOBAL HIGH LABEL FAILED}}
\ifdefstring{\kanban@mediumlabel}{NORMAL}
  {\TYPE{KANBAN GLOBAL MEDIUM LABEL OK}}
  {\TYPE{KANBAN GLOBAL MEDIUM LABEL FAILED}}
\ifdefstring{\kanban@lowlabel}{ROUTINE}
  {\TYPE{KANBAN GLOBAL LOW LABEL OK}}
  {\TYPE{KANBAN GLOBAL LOW LABEL FAILED}}
\ifdefstring{\kanban@donelabel}{FINISHED}
  {\TYPE{KANBAN GLOBAL DONE LABEL OK}}
  {\TYPE{KANBAN GLOBAL DONE LABEL FAILED}}
\ifdefstring{\kanban@mediumtext}{kanbanInk}
  {\TYPE{KANBAN MEDIUM CHIP CONTRAST OK}}
  {\TYPE{KANBAN MEDIUM CHIP CONTRAST FAILED}}
\makeatother
\pgfkeysifdefined{/tcb/kanban/header/.@cmd}
  {\TYPE{KANBAN PUBLIC HEADER STYLE OK}}
  {\TYPE{KANBAN PUBLIC HEADER STYLE FAILED}}
\pgfkeysifdefined{/tcb/kanban/card/.@cmd}
  {\TYPE{KANBAN PUBLIC CARD STYLE OK}}
  {\TYPE{KANBAN PUBLIC CARD STYLE FAILED}}
\pgfkeysifdefined{/tcb/kanban/deadline-chip/.@cmd}
  {\TYPE{KANBAN PUBLIC DEADLINE STYLE OK}}
  {\TYPE{KANBAN PUBLIC DEADLINE STYLE FAILED}}
\begingroup
  % Capture the named messages semantically. The console rendering of
  % l3msg varies across TeX Live releases.
  \ExplSyntaxOn
  \cs_set_protected:Npn \msg_warning:nnnn #1#2#3#4
    {\TYPE{KANBAN~WARNING:~#2~#3~'#4'}}
  \ExplSyntaxOff
  \kbset{labels={high=}}
\endgroup
\begingroup
  \ExplSyntaxOn
  \cs_set_protected:Npn \msg_warning:nn #1#2
    {\TYPE{KANBAN~WARNING:~#2}}
  \cs_set_protected:Npn \msg_warning:nnn #1#2#3
    {\TYPE{KANBAN~WARNING:~#2~'#3'}}
  \cs_set_protected:Npn \msg_warning:nnnn #1#2#3#4
    {\TYPE{KANBAN~WARNING:~#2~'#3'~#4}}
  \ExplSyntaxOff
  \kbdefinepalette*{broken}{red/}
  \kbdefinepalette{empty}{}
  \kbdefinepalette*{emptypairs}{}
  \kbdefinepalette{}{red}
\endgroup
\makeatletter
\ifdefstring{\kanban@highlabel}{URGENT}
  {\TYPE{KANBAN EMPTY LABEL PRESERVES VALUE OK}}
  {\TYPE{KANBAN EMPTY LABEL PRESERVES VALUE FAILED}}
\makeatother
\begin{kanban}[
    columns={Todo,Done},
    labels={high=IMMEDIATE,done=APPROVED}]
  \makeatletter
  \ifdefstring{\kanban@boardhighlabel}{IMMEDIATE}
    {\TYPE{KANBAN BOARD HIGH LABEL OK}}
    {\TYPE{KANBAN BOARD HIGH LABEL FAILED}}
  \ifdefstring{\kanban@boardmediumlabel}{NORMAL}
    {\TYPE{KANBAN BOARD MEDIUM LABEL SNAPSHOT OK}}
    {\TYPE{KANBAN BOARD MEDIUM LABEL SNAPSHOT FAILED}}
  \ifdefstring{\kanban@boarddonelabel}{APPROVED}
    {\TYPE{KANBAN BOARD DONE LABEL OK}}
    {\TYPE{KANBAN BOARD DONE LABEL FAILED}}
  \makeatother
  \kanbantask[prio=high]{Todo}{Review the customization}
  \kanbantask[completed]{Done}{Approve the customization}
\end{kanban}
\begingroup
  \ExplSyntaxOn
  \cs_set_protected:Npn \msg_warning:nnnn #1#2#3#4
    {\TYPE{KANBAN~WARNING:~#2~#3~'#4'}}
  \ExplSyntaxOff
  \begin{kanban}[columns={Todo},labels={done=}]
    \makeatletter
    \ifdefstring{\kanban@boarddonelabel}{FINISHED}
      {\TYPE{KANBAN EMPTY BOARD LABEL PRESERVES VALUE OK}}
      {\TYPE{KANBAN EMPTY BOARD LABEL PRESERVES VALUE FAILED}}
    \makeatother
    \kanbantask{Todo}{Exercise empty board label validation}
  \end{kanban}
\endgroup
\begin{kanban}[columns={Dark heading,Light heading},palette=contrast]
  \makeatletter
  \edef\kbfirstheadingtext{\csuse{kanban@headingtext@1}}
  \edef\kbsecondheadingtext{\csuse{kanban@headingtext@2}}
  \ifdefstring{\kbfirstheadingtext}{white}
    {\TYPE{KANBAN PAIRED PALETTE WHITE TEXT OK}}
    {\TYPE{KANBAN PAIRED PALETTE WHITE TEXT FAILED}}
  \ifdefstring{\kbsecondheadingtext}{kanbanInk}
    {\TYPE{KANBAN PAIRED PALETTE DARK TEXT OK}}
    {\TYPE{KANBAN PAIRED PALETTE DARK TEXT FAILED}}
  \makeatother
  \kanbantask{Dark heading}{Check white heading text}
  \kanbantask{Light heading}{Check dark heading text}
\end{kanban}
\makeatletter
\ifcsdef{kanban@headingtext@1}
  {\TYPE{KANBAN HEADING TEXT CLEANUP FAILED}}
  {\TYPE{KANBAN HEADING TEXT CLEANUP OK}}
\makeatother
\makeatletter
\ifdefstring{\kanban@highlabel}{URGENT}
  {\TYPE{KANBAN BOARD LABEL SCOPE OK}}
  {\TYPE{KANBAN BOARD LABEL SCOPE FAILED}}
\makeatother
\END
\end{document}