While working on some dot2tex/graphviz oddities, I noticed something
strange: many of the doctests marked "optional - dot2tex graphviz"
actually pass even when neither dot2tex nor graphviz is installed.
There are 28 doctests which have "# optional - dot2tex" or "# optional -
dot2tex graphviz" (and which are not marked "not tested"). Of those 28
doctests, only 17 fail when the packages are not installed.
Since I don't really know those packages, I wonder what the reason is:
(A) Somebody added "optional - dot2tex graphviz" by mistake, possibly
copying/pasting it.
(B) The doctest doesn't actually test what the author of the doctest was
expecting: the intention was to write a doctest depending on
dot2tex/graphviz but this got messed up.
(C) Some Sage code doesn't properly raise an error when dot2tex/graphviz
is not installed.
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