rspec - ruby + Rspec : How should I be testing attr_accessor?

Question

我有一个 ReturnItem 类。

规范:

require 'spec_helper'

describe ReturnItem do
  #is this enough?
  it { should respond_to :chosen }
  it { should respond_to :chosen= }

end

类别:

class ReturnItem
  attr_accessor :chosen
end

这似乎有点乏味，因为几乎每个类都使用了 attr_accessor 。 rspec 中是否有一个快捷方式来测试 getter 和 setter 的默认功能？或者我是否必须为每个属性单独手动测试 getter 和 setter？

Answer 1

我为此创建了一个自定义 rspec 匹配器:

spec/custom/matchers/should_have_attr_accessor.rb

RSpec::Matchers.define :have_attr_accessor do |field|
  match do |object_instance|
    object_instance.respond_to?(field) &&
      object_instance.respond_to?("#{field}=")
  end

  failure_message_for_should do |object_instance|
    "expected attr_accessor for #{field} on #{object_instance}"
  end

  failure_message_for_should_not do |object_instance|
    "expected attr_accessor for #{field} not to be defined on #{object_instance}"
  end

  description do
    "checks to see if there is an attr accessor on the supplied object"
  end
end

然后在我的规范中，我像这样使用它:

subject { described_class.new }
it { should have_attr_accessor(:foo) }