在没有模型的情况下使用控制器的RSpec测试CanCan查看页面的能力

require 'rails_helper'
require 'cancan/matchers'

RSpec.describe AbilityController, type: :controller do
  # ...
end

RSpec.describe AbilityController, type: :controller do
  describe 'GET #show' do
    context 'when user is able to view page' do
      before do
        @user = create(:user) # 创建一个用户
        @ability = Ability.new(@user) # 创建用户的权限
        allow(controller).to receive(:current_ability).and_return(@ability) # 设置当前权限
      end

      it 'renders the show template' do
        get :show
        expect(response).to render_template(:show)
      end

      it 'returns a success response' do
        get :show
        expect(response).to be_successful
      end
    end

    context 'when user is not able to view page' do
      before do
        @user = create(:user)
        @ability = Ability.new(@user)
        @ability.cannot :read, :ability # 设置用户无法读取ability
        allow(controller).to receive(:current_ability).and_return(@ability)
      end

      it 'redirects to root path' do
        get :show
        expect(response).to redirect_to(root_path)
      end
    end
  end
end