Fancytree unit tests

QUnit 1.23.1; Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

Tests completed in 4 milliseconds.
0 assertions of 2 passed, 2 failed.

1. global failure (1, 0, 1)Rerun1 ms
   1. Script error.@ 1 ms

      Source:	:0

   Source: at window.onerror (https://dclgapps.communities.gov.uk/scriptLib/fancytree/lib/qunit.js:372:11)

2. global failure (1, 0, 1)Rerun0 ms
   1. Script error.@ 0 ms

      Source:	:0

   Source: at window.onerror (https://dclgapps.communities.gov.uk/scriptLib/fancytree/lib/qunit.js:372:11)