Controller spec example

my_controller_spec.rb

require 'rails_helper'

RSpec.describe MyController, type: :controller do
  describe 'GET #index' do
    render_views
    include_context 'with admin authenticated'

    it 'returns http success' do
      get :index, params: params
      expect(response).to have_http_status(:success)
    end
  end
end

Запуск:

bundle exec rspec spec/controller/my_controller_spec.rb