rspec错误时，测试重复的对象[Rails]

Question

我的rspec测试都运行良好，除了当我复制对象以测试属性的唯一性时。

模型如下:

应用程序/模型/driver.rb

1.  class Driver < ActiveRecord::Base
2.    attr_accessible :last_name, :first_name, :short_name
# irrelevant code
18. before_save do
19.   last_name = last_name.gsub(' ', '-').capitalize!
20.   if last_name.include? '-'
21.     last_name[(last_name.index('-'))+1] = last_name[(last_name.index('-'))+1].capitalize!
22.   end
23. end
24. before_save do
25.   first_name = first_name.gsub(' ', '-').capitalize!
26.   if first_name.include? '-'
27.     first_name[(first_name.index('-'))+1] = first_name[(first_name.index('-'))+1].capitalize!
28.   end
29. end
30. before_save { short_name.downcase! }
# more irrelevant code
59. validates :short_name, presence: true, length: { maximum: 10 },
60.                   uniqueness: { case_sensitive: false }

所以我通过复制驱动程序对象来测试short_name属性的唯一性，如下所示:

规范/模型/driver_spec.rb

require 'spec_helper'
  describe Driver do
    before do
      @driver = Driver.new(last_name: "Driver", first_name: "Example", short_name: "exdrvr")
    end
  subject { @driver }
  it { should respond_to(:last_name) }
  it { should respond_to(:first_name) }
  it { should respond_to(:short_name) }
  it { should be_valid }
  # a bunch of other tests, all of which work fine
  describe "when short name is already taken" do
    before do
      driver_with_same_short_name = @driver.dup
      driver_with_same_short_name.short_name = @driver.short_name.upcase
      driver_with_same_short_name.save
    end
    it { should_not be_valid }
  end

下面是我运行所有测试后得到的结果:

.................................F....
Failures:
  1) Driver when short name is already taken 
     Failure/Error: driver_with_same_short_name.save
     NoMethodError:
       undefined method `gsub' for nil:NilClass
     # ./app/models/driver.rb:19:in `block in <class:Driver>'
     # ./spec/models/driver_spec.rb:128:in `block (3 levels) in <top (required)>'
Finished in 1.74 seconds
38 examples, 1 failure
Failed examples:
rspec ./spec/models/driver_spec.rb:130 # Driver when short name is already taken

所以，基本上所有的测试运行良好，除了当我复制驱动程序对象。然后last_name属性突然变为nil。我试着从模型文件的第18-23行注释出before_save块，当然，我只是得到了first_name相同的错误信息。知道是怎么回事吗?

Answer 1

发现问题:不是在我的规格，但在模型的before_save块。我替换了驱动程序中的第18-23行。rb

before_save { self.last_name = last_name.gsub(' ', '-').split('-').each { |x| x.capitalize! }.join('-') }

， first_name块也是如此。测试结果很好更重要的是，模型现在正在做我想让它做的事情。我想这就是测试的目的吧!