ruby-on-rails - 使用 RSpec 测试多态关联

Question

我正在为多态关联编写 RSpec 代码。我有两个测试想法

使用Factory Girl建立多态关联

使用 rails 方法构建多态关联。

下面是我写的代码片段(相关代码在底部):

1) link_spec.rb，创建与 FactoryGirl 的关联。

describe "Book links" do
  let(:book) { FactoryGirl.create(:book) }
  let(:book_link) { FactoryGirl.create(:book_link, linkable: book) }

  subject{ book_link }

  it { should be_valid }

  it { should respond_to(:url) }
  it { should respond_to(:linkable) }
  its(:linkable) { should eq book }
end

2)link_spec.rb，通过rails方法创建关联。

describe "Book links" do
  let(:book) { FactoryGirl.create(:book) }
  let(:link) { book.links.create(url: "http://example.com") }

  subject { link }

  it { should be_valid }

  it { should respond_to(:url) }
  it { should respond_to(:linkable) }
  its(:linkable) { should eq book }
end

感觉后者测试比前者好，但没信心。
或者它们彼此等效？

书.rb

class Book < ActiveRecord::Base
  has_many :links, as: :linkable
end

链接文件

class Link < ActiveRecord::Base
  belongs_to :linkable, polymorphic: true
end

工厂.rb

factory :book do
  title "Foo bar"
  author "John"
end

factory :book_link, class: "Link" do
  association :linkable, factory: :book
  url "http://examle.com"
end

Answer 1

I feel the latter is testing better than the former, but have no confidence.

如果您打算隐含地询问哪个“更好”，那么该问题不适合 StackOverflow。

Or are they equivalent to each other?

从某种意义上说，设置结果相同 Link对象正在创建，我会说是的，它们是等效的。但是，第二个测试了为 Book 设置的关联辅助方法。 ，您可能会觉得这是可取的。