RSpec good idea?

gistfile1.rb

describe CommentsController do
  describe '#create' do
    context 'with valid form' do
      let(:expect_commenting) { expect{ post :create, comment: { user_id: 1, body: "This is a comment" } } }

      subject {
        post :create, comment: { user_id: 1, body: "This is a comment" }
        @controller
      }

      it { expect_commenting.to change{Comment.count}.by 1 }
      it { should redirect_to comments_path }
      it { should set_the_flash[:notice].to 'Comment Created!' }
    end
  end
end