describe 'POST #create' do
  subject(:do_create) { post :create, menu: attributes_for(:menu) }

  context 'with valid attribute' do
    it 'create new menu' do
      expect{do_create}.to change(Menu, :count).by(1)
    end
  end
end


Failure/Error: subject(:do_create) { post :create, menu: attributes_for(:menu) }
     ActionController::ParameterMissing:
       param is missing or the value is empty: menu