Any quick way to identify which users are set as a 'test user'?

I tried using ZCC to search one of the users subfolders with 'test status: yes' and it doesn't return anything, yet I definitely have some test users as they have relationships to a few policies/bundles with sandboxes.

I also took a look at zman and didn't see anything relevant beyond zman ui which does display a value for test user, but doesn't take wildcards or appear to be particularly scriptable without some additional effort.