Proc refactoring for controller test

proc_spec_sample.rb

describe 'POST #create' do
  let(:create_request) { Proc.new { |q| post :create, question: attributes_for(q) } }
 
  context 'with valid object' do
    it 'saves the new question in the database' do
      expect { create_request.call(:question) }.to change(Question, :count).by(1)
    end
 
    it 'redirects to show this question view' do
      create_request.call(:question)
      expect(response).to redirect_to question_path(assigns(:question))
    end
  end
 
  context 'with invalid object' do
    it 'does not save the question' do
      expect { create_request.call(:invalid_question) }.to_not change(Question, :count)
    end
 
    it 're-renders template with form for new question' do
      create_request.call(:invalid_question)
      expect(response).to render_template :new
    end
  end
end