$c->add_relationship( 'n8', 'n13', { 'type' => 'spelling' } );
$c->calculate_ranks();
-my $stemma = $tradition->add_stemma( 't/data/simple.dot' );
+my $stemma = $tradition->add_stemma( dotfile => 't/data/simple.dot' );
# Test for object creation
ok( $stemma->isa( 'Text::Tradition::Stemma' ), 'Got the right sort of object' );