Change requires so export/upstart_spec can be run on its own.

spec/foreman/export/upstart_spec.rb

@@ -1,4 +1,5 @@
 require "spec_helper"
+require "foreman/engine"
 require "foreman/export/upstart"
 
 describe Foreman::Export::Upstart do

spec/spec_helper.rb

@@ -3,7 +3,7 @@ require "rspec"
 require "fakefs/safe"
 require "fakefs/spec_helpers"
 
-$:.unshift "lib"
+$:.unshift File.expand_path("../../lib", __FILE__)
 
 def mock_error(subject, message)
   mock_exit do