ruby on rails 测试札记（model）

ruby on rails 测试笔记（model）

rake db:migrate RAILS_ENV=test

1.App/modles/test_paper.rb

class TestPaper < ActiveRecord::Base
  attr_accessible :course_id, :user_id


  belongs_to :course
  belongs_to :user
  has_many :test_paper_test_questions


  has_many :test_questions, :through => :test_paper_test_questions


  validates :course_id, :presence => true
  validates :user_id,   :presence => true


  def self.make_test_paper_for(course,user)
    paper = self.create(:course_id => course.id,:user_id => user.id)
    paper.select_questions!
    paper
  end


  def select_questions!
    if self.test_questions.blank?
      test_questions = self.course.test_questions.to_a.shuffle
      selected = test_questions[0,10]
      self.test_questions = selected     
    end
  end


  def self.find_paper_for(course,user)
    course.test_papers.find_by_user_id(user.id)
  end
end

2.spec/factories/

--test_paper.rb

FactoryGirl.define do
  factory :test_paper do
    course
    user
  end
end

--course.rb

FactoryGirl.define do
  factory :course do
    sequence(:name){|n| "course_name_#{n}" }
    sequence(:cid){|n| n }
    sequence(:desc){|n| "desc_#{n}" }
    sequence(:syllabus){|n| "syllabus_#{n}" }


    creator
  end
end

3.spec/models/test_paper_spec.rb

第一种：

require 'spec_helper.rb'


describe TestPaper do
  describe '.make_test_paper_for' do
    let(:course) {FactoryGirl.create(:course)}
    let(:user)   {FactoryGirl.create(:user)}


    let(:paper)  {FactoryGirl.create(course, user)}


    before{
      1.upto(20){FactoryGirl.create(:test_question, :course => course)}


    }


    it '创建一个新试卷并随机选出10道题组卷' do
      paper.user.should eq user
      paper.course.should eq course
      paper.test_questions.count.should eq 10
    end

  end
end

第二种：

require 'spec_helper.rb'


describe TestPaper do
  describe '.make_test_paper_for' do

    

    before{

      @course = FactoryGirl.create(:course)

     @user = FactoryGirl.create(:user)
      1.upto(20){FactoryGirl.create(:test_question, :course => @course)}

    @paper = FactoryGirl.create(@course,@ user)}
    }


    it '创建一个新试卷并随机选出10道题组卷' do
      @paper.user.should eq @user
      @paper.course.should eq @course
      @paper.test_questions.count.should eq 10
    end

  end
end

第三种：
require 'spec_helper.rb'


describe TestPaper do
  describe '.make_test_paper_for' do
    let(:course) {FactoryGirl.create(:course)}
    let(:user)   {FactoryGirl.create(:user)}


    let(:paper)  {FactoryGirl.create(course, user)}
    subject      {TestPaper.make_test_paper_for(course, user)}


    before{
      1.upto(20){FactoryGirl.create(:test_question, :course => course)}


    }


    it '创建一个新试卷并随机选出10道题组卷' do
      paper.user.should eq user
      paper.course.should eq course
      paper.test_questions.count.should eq 10
    end


    context '创建一个新试卷' do
      its(:user)   {should eq user}
      its(:course) {should eq course}
      it '随机选10道题组卷' do
        subject.test_questions.count.should eq 10
      end
    end


  end
end

4.rspec spec/models/test_paper_spec.rb