ruby-on-rails – 如何保持RSpec测试的可管理性

是否有合理的方法将这些测试分解并分解为更小的块？你会如何根据什么标准去做？例子非常受欢迎.

例：

require 'spec_helper'

describe "AuthenticationPages" do
  subject { page }

  describe "signin" do
    before { visit signin_path }

    it { should have_selector('h1',text: 'Sign in') }
    it { should have_selector('title',text: full_title('Sign in')) }

    describe "with invalid information" do
      before { click_button "Sign in" }

      it { should have_selector('title',text: full_title('Sign in')) }
      it { should have_selector('div.flash.error',text: 'Invalid') }
      it { should_not have_link('Profile',href: signout_path ) }
      it { should_not have_link('Settings',href: edit_user_path) }

      describe "after visiting another page" do
        before { click_link "Home" }
        it { should_not have_selector('div.flash.error') }
      end
    end

    describe "with valid information" do
      let(:user) { FactoryGirl.create(:user) }
      before do
        fill_in "Email",with: user.email
        fill_in "Password",with: user.password
        click_button "Sign in"
      end

      it { should have_selector('title',text: user.name) }
      it { should have_link('Profile',href: user_path(user)) }
      it { should have_link('Settings',href: edit_user_path(user)) }
      it { should have_link('Users',href: users_path) }
      it { should have_link('Sign out',href: signout_path) }

      it { should_not have_link('Sign in',href: signin_path) }

      describe "visiting the sign up page" do
        before { visit sign_up_path }
        it { should_not have_selector('h1',text: 'Sign Up') }
        it { should_not have_selector('title',text: full_title('Sign Up')) }
      end

      describe "submitting to the create action" do
        before { post users_path(user) }
        specify { response.should redirect_to(user_path(user)) }
      end

      describe "followed by signout" do
        before { click_link "Sign out" }
        it { should have_link('Sign in') }
      end
    end
  end

  describe "authorization" do

    describe "for non-signed-in users" do
      let(:user) { FactoryGirl.create(:user) }

      describe "in the users controller" do

        describe "visiting the edit page" do
          before { visit edit_user_path(user) }
          it { should have_selector('title',text: 'Sign in') }
        end

        describe "submitting to the update action" do
          before { put user_path(user) }
          specify { response.should redirect_to(signin_path) }
        end
      end

      describe "visiting user index" do
        before { visit users_path }
        it { should have_selector('title',text: 'Sign in') }
      end

      describe "when attempting to visit a protected page" do
        before do
          visit edit_user_path(user)
          sign_in user
        end

        describe "after signing in" do
          it "should render the desired protected page" do
            page.should have_selector('title',text: 'Edit user')
          end

          describe "when signing in again" do
            before do
              visit signin_path
              sign_in user
            end

            it "should render the default (profile) page" do
              page.should have_selector('title',text: user.name)
            end
          end
        end
      end
    end

    describe "as wrong user" do
      let(:user)        { FactoryGirl.create(:user) }
      let(:wrong_user)  { FactoryGirl.create(:user,email: "wrong@example.com") }
      before            { sign_in user }

      describe "visiting users#edit page" do
        before { visit edit_user_path(wrong_user) }
        it { should have_selector('title',text: 'Sample App') }
      end

      describe "submitting a PUT request to the users#update action" do
        before { put user_path(wrong_user) }
        specify { response.should redirect_to(root_path) }
      end
    end

    describe "as non-admin user" do
      let(:user) { FactoryGirl.create(:user) }
      let(:non_admin) { FactoryGirl.create(:user) }

      before { sign_in non_admin }

      describe "submitting a DELETE request to the Users#destroy action" do
        before { delete user_path(user) }
        specify { response.should redirect_to(root_path) }
      end
    end
  end
end