Currently the caching in tmp/ can cause the testsuite to affect production. The following scenario will reproduce the issue:

1) Create a Host in the UI
2) View the Host's PXELinux template - observe that foreman_url() creates the right url (using Settings[:foreman_url] )
3) Run the tests (or at least functional/unattended_controller_test.rb)
4) Refresh the template view - the url will now have "http://test.host" instead of the correct value.

This seems to be because all running environments (including test) share the same cachedir. Tests should probably cache to test/tmp/