如何使用rspec规范draper装饰器。

Question

我正试图为我的装潢师中的各个功能编写规范。我为我的助手提供了如下的规范(这只是一个例子)：

book_helper.rb

module BookHelper
  def heading_title
    @book.name[0..200]
  end
end

book_helper_spec.rb

require 'spec_helper'

describe BookHelper do
  subject { FactoryGirl.build(:book) }

  it 'limits title to 200 characters' do
    title = 'Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium.'
    subject.name = title
    subject.save
    @book = subject
    expect(heading_title).to eq(title[0..200])
  end
end

给定下面的装饰器，我如何为函数编写规范？

book_decorator.rb

class BookDecorator < Draper::Decorator
  delegate_all

  def display_days
    model.months_to_display * 30
  end
end

Answer 1

对于你的样本，我会尝试如下：

require 'spec_helper'

describe BookDecorator do
  let(:book) { FactoryGirl.build_stubbed(:book).decorate }

  it 'returns the displayed days' do
    expect(book.display_days).to eq('600')
  end

end

Answer 2

只需对生成的实体使用.decorate (使用FactoryGirl或Faker)