Ruby + Rspec:我应该如何测试attr_accessor？

Question

我ReturnItem上课了.

眼镜:

require 'spec_helper'

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

end

类:

class ReturnItem
  attr_accessor :chosen
end

这似乎有点乏味,因为attr_accessor几乎每个班级都使用它.在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和手动测试getter和setter的过程？

Answer 1

我为此创建了一个自定义的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,我这样使用它:

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

Answer 2

这是使用RSpec的3以前的答案的更新版本,取代failure_message_for_should了failure_message和failure_message_for_should_not为failure_message_when_negated:

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

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

  description do
    "assert there is an attr_accessor of the given name on the supplied object"
  end
end