测试scope

describe 'scope' do
    describe '.recommendations' do
      before(:each) do
       course.recommend = true
       course.save!
      end
      it { expect(Course.recommendations.count).to be(1)}
    end

    describe  'hotness' do
      let(:user) { create :user}
      let(:course) { create :course}
      before(:each) do
        learning = CourseLearning.new
        user.enroll(course, learning)
      end
      it { expect(course.learning_count).to be(1)}
      it 'return 0' do
        # expect(user.cancel_enroll(course)).to be_truthy
        user.cancel_enroll(course)
        expect(Course.find(course.id).learning_count).to eq(0)
      end
      it 'return 2' do
        user_2 = create :user
        learning = CourseLearning.new
        user_2.enroll(course, learning)
        expect(course.learning_count).to be(2)
      end
    end
  end