rspec 测试模型验证主题错误

Question

这是我的验证测试，我想找到编写模型规范的最佳方法，特别是验证。但我对下面的代码有问题。

require 'spec_helper'

describe Ad, :focus do
  let(:ad) { Ad.sham!(:build) }

  specify { ad.should be_valid }

  it "not creates a new instane given a invalid attribute" do
    ad = Ad.new
    ad.should_not be_valid
  end

  [:title, :category_id, :email, :ad_content, :name, :price].each do |attr|
    it "should require a #{attr}" do
      subject.errors[attr].should include("blank") 
    end
  end    
end

当我运行此规范时，我收到此错误：

   5) Ad should require a name
     Failure/Error: subject.errors[attr].should include("blank")
       expected [] to include "blank"
       Diff:
       @@ -1,2 +1,2 @@
       -blank
       +[]
     # ./spec/model/ad_spec.rb:15:in `block (3 levels) in <top (required)>'

Answer 1

这里的问题是您在检查错误之前没有调用valid? 该示例。您在上一个示例中（间接）调用了它，但不是您断言有错误的那个。

正确的方法是这样的：

[:title, :category_id, :email, :ad_content, :name, :price].each do |attr|
  it "should require a #{attr}" do
    subject.valid?
    subject.errors[attr].should include("blank")
  end
 end