add test file showing usage of cache package

tests/wip/test.tex

@@ -0,0 +1,43 @@
+\documentclass{article}
+
+
+
+%%% Setting a higher cache version will cause a re-evaluation of the
+% \DeclareCachedDocumentCommand macros present in the preamble
+% Otherwise, the definitions can be altered or even removed without breaking
+% the document, as long as the aux file is present.
+
+
+
+%% \DeclareCachedDocumentCommand is now just a plain wrapper around \DeclareDocumentCommand
+%% that implements this caching, so it is not useful on itself
+%% 
+%% If \DeclareCachedDocumentCommand is, however, some macro that does lengthy computations
+%% and then issues one ore more of underlying \DeclareDocumentCommands
+%% we can save this computation on the second run, since we do not evaluate
+%% \DeclareCachedDocumentCommand further (we just copied its definition)
+%% and load the plain definitions that the  invocation produced in the last run
+%% and that we saved to the aux file for restoration.
+
+\usepackage[cache version = 0]{mkessler-cache}
+
+\DeclareCachedDocumentCommand\foo{m}{foo: Called with argument '#1'. hi}
+\DeclareCachedDocumentCommand\baz{m}{baz: Called with argument '#1'.}
+
+\DeclareCachedDocumentCommand\parser{!s !t+}
+  {
+    \IfBooleanT {#1} {*}
+    \IfBooleanT {#2} {$\dagger$}
+  }
+
+\begin{document}
+
+\foo {  one  }
+
+\baz{ arg }
+
+\parser*+
+
+Some text.
+  
+\end{document}