How i implement test rspec for controller admin trestle

Question

I create the controller copy syllabus in trestle in:

app/admin/copy_syllabus.rb

This is my content

Trestle.admin(:copy_syllabus) do
   menu do
     item :copy_syllabus, icon: "fa fa-tachometer"
   end

   controller do
     def index

     end

     def create
     end
  end

So I need to add rspec test for this controller

I tried with this structure of files

rspec/admin/copy_syllabus_controller.rb

But when I run:

rspec spec 

show me the error

NameError:
  uninitialized constant Admin::CopySyllabusController