#18001 commented out existing tests for the plugin permissions and pagelets API in test/unit/plugin_test.rb, but it's unclear to me from the commit or issue why this was done:

https://github.com/theforeman/foreman/commit/72a28408aa23bf4f7f7a6fa201abee8305c253ba#diff-948d9314cd8a098f39e5c18d33d8cef6R461

The tests should probably still be present.