use strict; use warnings;
use Test::More;
use lib 'lib';
+use File::Which;
use Text::Tradition;
use XML::LibXML;
use XML::LibXML::XPathContext;
+plan skip_all => 'Need Graphviz installed to test graphs'
+ unless File::Which::which( 'dot' );
+
my $datafile = 't/data/Collatex-16.xml';
my $tradition = Text::Tradition->new(