RSpec-Rails (基礎篇)(5): 撰寫Model測試

RSpec-Rails教學（基礎篇）全部內容

建立另一個model與post產生關連。

$ rails g model comment content:text post_id:integer
$ rake db:migrate

在app/models/post.rb撰寫新的code。

class Post < ActiveRecord::Base
  validates :title, :presence => true
  has_many :comments

  def self.no_content
    where(:content => nil)
  end

  def abstract
    self.content[0..20]
  end
end

在app/models/comment.rb當中建立關連。

class Comment < ActiveRecord::Base
  belongs_to :post
end

接著在原本的model測試檔案內，新增測試。

spec/models/post_spec.rb

    it "validates title" do
      expect(Post.new).not_to be_valid
      expect(Post.new(:title => "title")).to be_valid
    end

    it ".no_content" do
    post_with_content = Post.create(:title => "title", :content => "content")
      post_without_content = Post.create(:title => "title", :content => nil)    
      expect(Post.no_content).to include post_without_content
      expect(Post.no_content).not_to include post_with_content
    end

    it "#abstract" do
      post = Post.create(:title => "title", :content => "12345678901234567890_not_abstract")
      expect(post.abstract).to include("12345678901234567890")
      expect(post.abstract).not_to include("not_abstract")
    end

    it "has_many comments" do
      post = Post.create(:title => "title", :content => "content")
      comment = Comment.create(:content => "content", :post_id => post.id)
      expect(post.comments).to include(comment)
    end

進行測試：

$ rspec spec/models

應該就會順利通過囉！