`chef_zero/server` Ruby module not found in Serverspec test for omnibus--installed chef-clients
require 'chef_zero/server'
fails in kitchen verify
with serverspec when an omnibus-packages chef client is installed.
chef-zero is installed beneath /opt/chef/embedded/lib/ruby/gems/2.5.0/gems/
and can be loaded inside /opt/chef/embedded/irb
without problems.