As the 'test' bundler group is excluded when building assets in an RPM environment, the rubocop dependency isn't installed. This causes an error trying to load its tasks:

+ BUNDLER_EXT_GROUPS='default assets'
+ /usr/bin/ruby193-rake assets:precompile:all RAILS_ENV=production --trace
rake aborted!
cannot load such file -- rubocop/rake_task
/opt/rh/ruby193/root/usr/share/rubygems/rubygems/custom_require.rb:36:in `require'
/opt/rh/ruby193/root/usr/share/rubygems/rubygems/custom_require.rb:36:in `require'
/opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `block in require'
/opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in `load_dependency'
/opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require'
/builddir/build/BUILD/foreman-1.7.0/lib/tasks/rubocop.rake:2:in `<top (required)>'
/opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:245:in `load'
/opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:245:in `block in load'
/opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in `load_dependency'
/opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:245:in `load'
/opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/engine.rb:425:in `block in load_tasks'
/opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/engine.rb:425:in `each'
/opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/engine.rb:425:in `load_tasks'
/opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/application.rb:145:in `load_tasks'
/opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/railtie/configurable.rb:30:in `method_missing'
/builddir/build/BUILD/foreman-1.7.0/Rakefile:7:in `<top (required)>'