I forgot to say that I created https://trac.sagemath.org/ticket/24001
for this.
On 2017-10-09 21:15, Jeroen Demeyer wrote:
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.
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