Do Not Require PIADMINS Mapping
The test scripts require that the user running the script have a mapping to the built in group "piadmins". That group is often disabled or removed in production systems and this prevents the test from running.
I understand the scripts are written for vanilla, freshly installed systems but I don't believe such a specific test should be part of a test suite.
The latest version of the PI System Deployment Tests (version 1.0.2) does not require PIADMINS mapping and instead has a list of required permissions for each tested product.
You can find the list of access privileges in the Requirements document: