t/01-basic.t fails

[eseyman]

I'm trying to build a Fedora package for DBIx-Class-Visualizer but t/01-basic.t fails.
Build log is attached.
DBIx-Class-Visualizer.txt

[eseyman]

I've had a little more time to investigate this.

At one point, transformed_svg() tries to add data attributes to everything in nodes.
The transformed_svg subtest tries to do this to the element <text class="column-name" text-anchor="start" x="104.5" y="-54.3">_</text> which leads to running encode_json($result_handler->get_column($column_name)->TO_JSON) with $column_name being set to '_'. which fails miserably.

[eserte]

I see this error also on Ubuntu 18.04 and several FreeBSD installations, but not on Debian/stretch or other Debian versions. The only difference I see between these systems is the graphviz version: 2.40.1 (Ubuntu, FreeBSD) vs. 2.38.0 (Debian/stretch).

[eserte]

It fails also on Debian/buster and CentOS8 --- both have graphviz 2.40.1, too.