\input regression-test.tex
\documentclass{article}
\usepackage{kanban-board}
\ExplSyntaxOn
\NewDocumentCommand \kbcheckglobalcolumns {mm}
  {
    \str_if_eq:eeTF
      {\clist_use:Nn \g__kanban_columns_clist {,}} {#1}
      {\TYPE{#2~OK}}
      {\TYPE{#2~FAILED}}
  }
\NewDocumentCommand \kbcheckboardcolumns {mm}
  {
    \str_if_eq:eeTF
      {\clist_use:Nn \l__kanban_board_columns_clist {,}} {#1}
      {\TYPE{#2~OK}}
      {\TYPE{#2~FAILED}}
  }
\NewDocumentCommand \kbcheckdefaultids { }
  {
    \str_if_eq:eeTF
      {
        \prop_item:Nn \l__kanban_column_ids_prop {BACKLOG},
        \prop_item:Nn \l__kanban_column_ids_prop {DOING},
        \prop_item:Nn \l__kanban_column_ids_prop {DONE}
      }
      {1,2,3}
      {\TYPE{KANBAN~DISTINCT~COLUMN~IDS~OK}}
      {\TYPE{KANBAN~DISTINCT~COLUMN~IDS~FAILED}}
  }
\ExplSyntaxOff
\begin{document}
\sbox0{\scriptsize $x$}% Load math font sizes outside captured output.
\START
\kbcheckglobalcolumns{BACKLOG,DOING,DONE}{KANBAN BUILTIN COLUMNS}
\begin{kanban}
  \kbcheckboardcolumns{BACKLOG,DOING,DONE}{KANBAN OMITTED COLUMNS}
  \kbcheckdefaultids
  \makeatletter
  \ifcsstring{kanban@name@1}{Backlog}
    {\TYPE{KANBAN DEFAULT HEADING SPELLING OK}}
    {\TYPE{KANBAN DEFAULT HEADING SPELLING FAILED}}
  \makeatother
  \kanbantask{backlog}{Default first column}
  \kanbantask{Doing}{Default second column}
  \kanbantask{dOnE}{Default third column}
\end{kanban}
\kbset{columns={Queued,Active,Complete}}
\kbcheckglobalcolumns{QUEUED,ACTIVE,COMPLETE}{KANBAN SETUP COLUMNS}
\begin{kanban}[break]
  \kbcheckboardcolumns{QUEUED,ACTIVE,COMPLETE}{KANBAN INHERITED COLUMNS}
  \kanbantask{aCtIvE}{Inherited column}
\end{kanban}
\begin{kanban}[columns={}]
  \kbcheckboardcolumns{QUEUED,ACTIVE,COMPLETE}{KANBAN EMPTY FALLBACK}
  \kanbantask{complete}{Empty argument fallback}
\end{kanban}
\begin{kanban}[columns={One,tWo}]
  \kbcheckboardcolumns{ONE,TWO}{KANBAN LOCAL COLUMNS}
  \makeatletter
  \ifcsstring{kanban@name@2}{tWo}
    {\TYPE{KANBAN HEADING SPELLING PRESERVED OK}}
    {\TYPE{KANBAN HEADING SPELLING PRESERVED FAILED}}
  \makeatother
  \kanbantask{oNe}{Local first column}
  \makeatletter
  \def\PackageError#1#2#3{\TYPE{KANBAN ERROR: #2}}\def\MessageBreak{}
  \makeatother
  \kanbantask{}{Missing target}
  \kanbantask{Missing}{Unknown target}
  \makeatletter
  \ifnum\csuse{kanban@count@\kanban@boardgroup @1}=1\relax
    \TYPE{KANBAN INVALID TASKS IGNORED OK}
  \else
    \TYPE{KANBAN INVALID TASKS IGNORED FAILED}
  \fi
  \makeatother
\end{kanban}
\kbcheckglobalcolumns{QUEUED,ACTIVE,COMPLETE}{KANBAN LOCAL SCOPE}
\begingroup
  \makeatletter
  \def\PackageError#1#2#3{\TYPE{KANBAN ERROR: #2}}\def\MessageBreak{}
  \makeatother
  \begin{kanban}[columns={Alpha,aLpHa}]
    \kbcheckboardcolumns{ALPHA}{KANBAN DUPLICATE NORMALIZATION}
    \makeatletter
    \ifcsstring{kanban@name@1}{Alpha}
      {\TYPE{KANBAN DUPLICATE KEEPS FIRST SPELLING OK}}
      {\TYPE{KANBAN DUPLICATE KEEPS FIRST SPELLING FAILED}}
    \makeatother
    \kanbantask{alpha}{Deduplicated column}
  \end{kanban}
\endgroup
\begin{kanban}[columns={Grouped}]
  {\kanbantask{Grouped}{A declaration inside an ordinary group}}
  \makeatletter
  \ifnum\csuse{kanban@count@\kanban@boardgroup @1}=1\relax
    \TYPE{KANBAN GROUPED TASK OK}
  \else
    \TYPE{KANBAN GROUPED TASK FAILED}
  \fi
  \xdef\kbtestboardid{\kanban@boardgroup}
  \makeatother
\end{kanban}
\begin{kanban}[columns={ Spaced name , Other}]
  \makeatletter
  \ifcsstring{kanban@name@1}{Spaced name}
    {\TYPE{KANBAN HEADING TRIMMED OK}}
    {\TYPE{KANBAN HEADING TRIMMED FAILED}}
  \makeatother
  \kanbantask{spaced name}{A trimmed heading}
\end{kanban}
\def\kbmacrocolumn{Macro Stage}
\begin{kanban}[columns={\kbmacrocolumn}]
  \kanbantask{macro stage}{A target expanded from a column-name macro}
  \makeatletter
  \ifnum\csuse{kanban@count@\kanban@boardgroup @1}=1\relax
    \TYPE{KANBAN MACRO COLUMN NORMALIZATION OK}
  \else
    \TYPE{KANBAN MACRO COLUMN NORMALIZATION FAILED}
  \fi
  \makeatother
\end{kanban}
\makeatletter
\ifcsdef{kanban@count@\kbtestboardid @1}
  {\TYPE{KANBAN BOARD CLEANUP FAILED}}
  {\TYPE{KANBAN BOARD CLEANUP OK}}
\makeatother
\begin{kanban}[columns={Outer}]
  \begingroup
    \makeatletter
    \def\PackageError#1#2#3{\TYPE{KANBAN ERROR: #2}}\def\MessageBreak{}
    \makeatother
    \begin{kanban}[columns={Inner}]
      \kanbantask{Inner}{Ignored nested task}
      \kanbantask{Inner}{A second ignored nested task}
    \end{kanban}
  \endgroup
  \kanbantask{Outer}{Outer board remains valid}
  \makeatletter
  \ifnum\csuse{kanban@count@\kanban@boardgroup @1}=1\relax
    \TYPE{KANBAN NESTED ISOLATION OK}
  \else
    \TYPE{KANBAN NESTED ISOLATION FAILED}
  \fi
  \makeatother
\end{kanban}
\begingroup
  \makeatletter
  \def\PackageError#1#2#3{\TYPE{KANBAN ERROR: #2}}\def\MessageBreak{}
  \makeatother
  \kanbantask{ONE}{Outside board}
\endgroup
\TYPE{KANBAN COLUMNS OK}
\END
\end{document}